Hawke ChairGun Pro (ChairGun4) · PDF fileHawke ChairGun Pro (ChairGun4) Welcome to Hawke...

Hawke ChairGun Pro (ChairGun4) Welcome to Hawke ChairGun Pro

ChairGun4 is an Airgun Pellet Trajectory Calculator in which the user enters various parameters (of the airgun, pellet and scope) are input and is rewarded with graphs and tables depicting and predicting the flight and external ballistics of the pellet.

ChairGun4 uses a ‘modified point-mass’ ballistic algorithm that yields better accuracy for transonic and supersonic muzzle velocities associated with rim-fire applications and more energetic airguns.

ChairGun4 is a complete, ground-up rewrite in the Java language so that it can be run on any platform that supports the Java Runtime Environment although this initial instance is tailored particularly for the Windows and OSX environments.

Installation

Windows:Download the ChairGun4_Setup.exe file into a temporary directory and run it. If the Java JRE is not already installed on the PC then you’ll be prompted to download and install it.By default, this will properly register and load the ChairGun4.exe executable into a sub-directory of Program Files,

i.e., 'C:\Program Files\ChairGun4\' .... (or, if you're using 64-bit Vista or Windows7 or 8 ... 'C:\Program Files (x86)\ChairGun4\' ....)

A directory structure will also be created in C:\ProgramData\ChairGun4\

i.e., ! C:\ProgramData\ChairGun4\Data ! - user Data files.! C:\ProgramData\ChairGun4\Images ! - user Image (.jpg) files.! C:\ProgramData\ChairGun4\CSV ! - user CSV (.csv) files.! C:\ProgramData\ChairGun4\Pel ! ! - user Pellet (.tsv) files.! C:\ProgramData\ChairGun4\Profiles ! - user Custom Profile (.pro) files.! C:\ProgramData\ChairGun4\Stats ! - user Statistics (.dat) files.! C:\ProgramData\ChairGun4\Etc ! ! - various system files.

To run ChairGun4, navigate to the installation directory (C:\Program Files\ChairGun4 or C:\Program Files (x86)\ChairGun4) and click on ChairGun4.exe. It may be a good idea to make a link to ChairGun4.exe and put it on your desktop if you didn't allow the setup to do it for you.

Alternatively, ‘Start>Programs>Hawke Sport Optics>Hawke ChairGun Pro’ and click on the ‘Hawke ChairGun Pro’ icon.

OSX:All versions of OSX have Apple’s version of the Java JRE preinstalled but it may be a good idea to download the latest update from Apple.Download the ChairGun4_pkg.zip file, unzip the ChairGun4.pkg installation file and run it.

A <user name>\ChairGun4\ directory structure will also be created in your user directory

i.e., ! <user name>\ChairGun4\Data ! ! - user Data files.! <user name>\ChairGun4\Image ! ! - user Image (.jpg) files.! <user name>\ChairGun4\CSV ! ! - user CSV (.csv) files.! <user name>\ChairGun4\Pel ! ! - user Pellet (.tsv) files.! <user name>\ChairGun4\Profiles ! - user Custom Profile (.pro) files.

(4.0.8)

! <user name>\ChairGun4\Stats ! ! - user Statistics (.dat) files.! <user name>\ChairGun4\Etc ! ! - various system files.

To run ChairGun4, simply click on the ChairGun4 application icon in your Applications folder.

The Least You Need To Know

When you first run ChairGun4 the display should look something like this:

.... A specimen data file (called default.cgp4) has been pre-loaded so that you can start immediately. The supplied default configuration file has setups for popular application. Select the particular combination/calibre by clicking on the appropriate Tab (0.177 Airgun, 0.22 Airgun, 0.17 HMR or 0.25 Airgun) and select your preferred pellet by clicking on the area to the left and below the Tabs (reads "Pellet: AA Field" on the above image).

(4.0.8)

The Tabs and Combos can be any calibre that you want - they could all refer 0.177 (for example) if that's what you need.

Right-Click on the ‘Reticle:’ item (or left-click on the ‘Reticles’ menu item) to select a suitable reticle, right-click on the ‘Profile’ item to select an appropriate ballistic profile (GA is fine for most airgun pellets, RA4 for .22 LR, GS for ball and G1 for almost everything else). Right-click on the ‘Combo:’ item and select ‘Edit Combo Name’ to enter an appropriate name for the pellet/rifle/scope combination.Change the values in the textboxes to suit your particular combination (either by entering a value manually and pressing enter or - if your mouse is equipped - by rolling the mousewheel up/down) and, clicking on the ‘Table’ or ‘Graph’ items, select the graph or table (or both) that you want to display.

Tooltips

Hovering the mouse-pointer over a control or item will present a transient tooltip.

Popup Menus

In general, right-clicking on an object will raise a popup-menu with a selection of items relevant to the particular textbox, function, etc. These popups (listed and amplified in the text below) all have a ‘Do Nothing’ item which simply closes the popup without further action.

That's got you started. Play with the numbers, menus and buttons - the following will show you how. Click on the Quit option (File Menu/Windows, Main Menu/OSX) to exit.

(4.0.8)

Main MenuThe menus and menu items shown below are taken from the OSX version of ChairGun4. Although the Windows items are generally identical some platform-dependent differences do exist and these are described in the text.

File Menu

Options for manipulating ChairGun4’s data files:Save ... ! saves the current setup under its current ! name as a ChairGun4 .cgp4 file.

Save As ... ! saves the current setup with a user-defined ! ! ! ! ! ! ! name (as a ! ChairGun4 .cgp4 file).Open ... ! opens an existing .cgp4 or .cg3 datafile for use. Datafiles in .cg3 format are loaded, ! translated and re-written in the .cgp4 format. i.e.,! If the .cg3 datafile is named MyData.cg3, on selection it will be read, translated and ! saved as MyData(cg3).cgp4 Import .CG3 Datafile ...! Load and translate an existing .cg3 datafile.If there is no existing Windows /! ProgramData/ChairGun3/Set directory (or <user home>/ChairGun3/ on OSX) on ! the local machine then this option will be hidden.Pellet Database Management ...! Provides options to: Save Current Database, Open an Alternative database (maybe ! an existing ChairGun3 database) and to Backup the current database (preferably ! under a different name).

The OSX File Menu is shown here. The Windows equivalent also has a ‘Quit’ option - which closes the application. The ‘Quit’ option - on OSX - appears on the System Menu instead.

(4.0.8)

Reticles Menu

The Reticles Menu displays a list of Hawke and generic reticles complete with a thumbnail view.Hawke Reticle Information ... If an Internet connection is present, opens the system web-browser to view reticle information on the Hawke Optics website.Choose a reticle from ...General Purpose Reticles:! Hawke SR6! Hawke SR12! Hawke MAP6! Hawke MAP6a! Hawke MAP8! Hawke SR ProDeer PASS Reticles (Point And Shoot)! Hawke Deer PASS SR! Hawke Deer PASS MAPMil-Dot Reticles! Hawke 10x 1/2 Mil-Dot Reticle! Hawke 20x 1/2 Mil-Dot ReticleGeneric Reticles! Generic Mil-Dot Reticle! Generic 30/30 Reticle

Profile Menu (Ballistic Profiles)

ChairGun4 has the facility to choose any of six Ballistic Profiles - depending on the particular application:G1 - Standard ModelGA - Diabolo Airgun Pellet candidateGL - Blunt nose, exposed leadGS - Round ball (smooth)RA4 - 0.22 Long RifleGC - Plain Cylinder Gx - User Defined

For general use, the recommendation is:a) GA profile for round-nosed, waisted, diabolo airgun pellets, GL for pointed or hollow-

pointed pellets,b) GS profile for spherical projectiles,c) RA4 profile for round-nosed 0.22 LR ammunition, GL or G1 for hollow-point bullets,d) GC - for flat-faced, cylindrical cast bullets/pellets, ande) G1 for just about anything else.

(4.0.8)

Embellishments Menu! The Embellishments Menu controls the way in ! which artifacts are added to graphs and tables.! General Items:

Colour Gradient on Tables/Graphs! Shows/hides the user-configurable colour ! gradient on table/graph backgrounds.POI Items: Kill Zone! Turns the Kill-Zone ON/OFF as depicted on ! the POI graph. Point Blank Range! Displays/hides the Point Blank Range on ! the POI graph. Show Laser Line! Displays/hides the Laser line on the POI ! graph. Show Bore Line:! Shows/hides the bore-line.

Energy & Momentum Markers: indicates retained energy and/or momentum on the POI graph.Righthand side Markers: determines what gets shown on the righthand side of the POI graph:

Units! Same as the lefthand side.Reticle Intercepts! The intersections of reticle points and the trajectory.Minutes of Arc (MoA)! The intersections of multiple MoAs with range.Clicks! The intersections of clicks (at the current Clicks/MoA setting) with ! range, andMilliradians (mils)! The intersections of multiple milliradian increments with range.

Windage Graph: Right hand side markers:Determines what gets shown on the righthand side of the windage graph:Units! Same as the lefthand side.Minutes of Arc (MoA)! The intersections of multiple MoAs with range.Clicks! The intersections of clicks (at the current Clicks/MoA setting) with ! range, andMilliradians (mils)! The intersections of multiple milliradian increments with range.

(4.0.8)

Configuration Menu

Configures the manner in which ChairGun4 works:Units! Imperial (Ft/s, Yards, Inches, etc.), or! Metric (m/s, m, cm, etc.).Enable Mousewheel! Turns on/off the ability to change values ! using the scroll-wheel.Colour Gradient on Print! Displays/hides a colour gradient on prints.

Tool Tips Management! Options to enable/disable tool tips and set ! the open delay and dismiss times

Show Reticle Thumbnails! Shows or hides the reticle image alongside ! the Reticles menusShow Rangefinder Automatically! Displays the associated Specialised ! Rangefinder when a reticle is selected.! (See Toolbox>‘Rangefinders’ below)Turn Windows-style Menu Bar ON/OFF! OSX only. Displays the main menu on the ! application or at the top of the screen.Edit Tab Names! Opens the Tab Name Editor.Edit Combo Names! Opens the Combo Name Editor.Edit Colour Scheme

! ! ! ! ! ! Opens the Colour Scheme Editor.

Pellet Update StrategyIf, having changed the weight or BC value of a pellet, the application can:a) Always update the pellet database accordingly,b) Ask if the pellet database is to be updated, orc) Never update (ignore any differences)

Exit StrategyIf the application variables have been changed, the application can:a) Always save the changes,b) Ask if the changes are to be saved, orc) Never save (the changes are ignored)

(4.0.8)

Toolbox Menu

A collection of useful applets, each designed for a specific task.View Applets ... (See ‘Reticle Views’ below)! Reticle View! ! Shows/hides a view of the current reticle.! Scope Cap View! ! Shows/hides a Scope Cap view of the ! ! current reticle.! Visualisation View! ! Shows/hides a view of the current reticle ! ! complete with trajectory.Rangefinder Applets! Rangefinders (See ‘Rangefinder Views’ below)! ! Universal Rangefinder! ! ! A base-line bracketing rangefinder ! ! ! applicable to all reticles.! ! Specialised Rangefinders! ! ! Specialised rangefinders for SR ! ! ! (SR6 & SR12), SRPro, Deer PASS ! ! ! SR and Mil-Dot (10x & 20x 1/2 ! ! ! Mil-Dot) reticles. See ! ! ! ‘Rangefinder Views’ below.! ! ! Selecting a rangefinder when it is ! ! ! already displayed will turn OFF the ! ! ! ‘Show Rangefinder !Automatically‘ ! ! ! item in the Configuration Menu. Calculate and Calibrate ...! Calculate BC from ...! ! Velocity Difference, or! ! POI at Range, or! ! Time to Target.! Generic Mil-Dot Calibration! ! Calculates the base ‘true’Mil-Dot calibration ! ! for a generic Mil-Dot scope. i.e., that ! ! magnification at which it complies with the ! ! Mil-Dot specification.! ! This option will be accessible only if the ! ! Generic Mil-Dot reticle option is selected.! Click Calibration! ! Calculates the actual click calibration of a ! ! scope.! Scope Mount Shims! ! Calculates the shims (or adjustment) ! ! required to optically centre a scope at a ! ! particular range.! Maximum Parallax Error! ! Calculates the maximum possible parallax ! ! error ! for any combination of target range, ! ! focus range ! and objective diameter.

(4.0.8)

Environment ...! Environmental Settings ...! ! Takes inputs for ambient temperature, ! ! ambient pressure and altitude and corrects ! ! the trajectory accordingly.Pellet Database ...! Reset Pellet Database! ! Deletes the current database and ! ! substitutes the built-in version - as when the ! ! application was first run.! Update Pellet Database! ! Optionally updates the current database ! ! with items from the Hawke Optics server.Custom Profile Tools:! Select Custom Profile ...! ! Allows selection of an existing custom ! ! profile (if available) from the Profiles ! ! directory.! Edit Custom Profile (*)! ! Opens the Custom Profile Editing applet ! ! (see below) where existing profiles can be ! ! edited, copied or new profiles created.Miscellaneous Functions ...! Statistics! ! A simple statistics applet.! PCP Efficiency! ! Displays the PCP Efficiency applet! Zero Range Functions! ! As the Zero Range popup menu below; ! ! options exist to set the far zero range to fit ! ! the current kill zone or to set the zero range ! ! for kill-zone = 0.! Quick Zero! ! Gives correction clicks to zero a reticle.! Fill Calculator! ! Calculates the number of PCP reservoir fills ! ! to be ! expected.! Range Cards! ! Generates simple range cards.! Maximum Range! ! A table and series of graphs indicating ! ! maximum height, range, velocity, etc. for ! ! various inclination angles.! Scope Tape! ! A simple scope-tape generator.! Cross Wind Analysis! ! A graph and table showing lateral deviation ! ! through (up to) four range zones.

(4.0.8)

Help Menu

A generic help menu.Help Topics! Shows this helpfile via a .pdf application.On-Line Help! Displays a (possibly updated) helpfile via a browser.Feedback! Send comments/suggestions/etc. to the developer via email.Hawke Optics Website! Visit the Hawke Optics Website for more information on Hawke ! products.Check for Updates! Polls the Hawke Optics server for information of later versions ! of ChairGun4.

The OSX Help Menu is shown above. The Windows variant also has an ‘About’ option (See ‘Applets’ below) and this is available to OSX users via the System Menu.

Tabs

Any ChairGun4 datafile retains the details of all four separate setups (profiles) and any one of these can be selected simply by clicking on the appropriate tab (e.g., ‘0.177 Airgun’, ‘0.17 HMR Rimfire’ above). The background gradient of the app will change to the appropriate colour - and the Pellet:/Reticle:/Profile:/Combo labels to the graph colour as above - to emphasize the change. To put ChairGun4 into comparison mode, simply click on the check-boxes on the left of each tab; the graph will then display the results of both the main and the compared selection on the same axes. Note that the checkbox of the primary selection is always and automatically checked. The primary selection can be compared to up to three other others by ticking the appropriate checkboxes. Clicking on a tab selects the particular profile and releases (clears) the checkboxes of all of the other profiles.

Popup Menus Tab Popup Menu

Do Nothing! Closes the popup without any action.Select This Tab! Selects the tab - same as left-clicking on the tab.Edit Tab Name! Opens the Tab Name Editor.Clone these details to all Tabs

(4.0.8)

! Copies all data in the selected profile to all other ! profiles. This is useful if the effect of changing ! (say) one or two parameters is being investigated.

Pellet: Popup Menu

Do Nothing! Closes the popup without any action.0.177 Pellets! Database of pellets less than 0.19” diameter.0.20 Pellets! Database of pellets between 0.19” and 0.21” ! diameter.0.22 Pellets! Database of pellets between 0.21” and 0.23” ! diameter.0.25 Pellets! Database of pellets between 0.23” and 0.26” ! diameter.BigBore Pellets! Database of pellets greater than 0.26” diameter.Print Pellet Database! Print the entire database or one of the defined ! categories.

A left-click on the Pellet: label opens the database at the current category.

Profile: Popup Menu

Do NothingCloses the popup without any action.

G1 - Standard ModelGA - Diabolo Airgun Pellet candidateGL - Blunt nose, exposed leadGS - Round ball (smooth)RA4 - 0.22 Long RifleGC - Plain Cylinder

... as per the ‘Profile’ Main Menu item.

(4.0.8)

Reticle: Popup Menu

Do Nothing Closes the popup without any action.General Purpose Reticles:! Hawke SR6! Hawke SR12! Hawke MAP6! Hawke MAP6a! Hawke MAP8! Hawke SR ProDeer PASS Reticles (Point And Shoot)! Hawke Deer PASS SR

! ! Hawke Deer PASS MAP! Mil-Dot Reticles! ! Hawke 10x 1/2 Mil-Dot Reticle! ! Hawke 20x 1/2 Mil-Dot Reticle! Generic Reticles! ! Generic Mil-Dot Reticle! ! Generic 30/30 Reticle

! ... as per the ‘Reticles’ Main Menu item.

Combo: Popup Menu

Do Nothing ! Closes the popup without any action.Edit Combo Name! Opens the Edit Combo Name Applet (see ‘Applets’ ! below)

Data Textboxes and Popup Menus

Weight

Projectile WeightProgram Limits: 5 Grain to 1000 Grain

Popup ...Do Nothing! Closes the popup without any action.Changing Weight changes Velocity! ChairGun4 will assume Constant Energy.! This is the default.Changing Weight changes Energy! ChairGun4 will assume Constant Velocity.

(4.0.8)

BC (Ballistic Coefficient)

Ballistic CoefficientProgram Limits: 0.005 to 0.500 Lbf/in²

Popup ...Do Nothing! Closes the popup without any action.Calculate BC from Velocity Change! See ‘Applets’ below.Calculate BC from POI Change! See ‘Applets’ below.Calculate BC from Elapsed Time! See ‘Applets’ below.

Muzzle Velocity

Muzzle VelocityProgram Limits: 200 to 3000 Ft/s

Popup ...Do Nothing! Closes the popup without any action.Minimum (0.178 Mach)! Equivalent to 200 Ft/s @ NTP0.250 Mach... Various reference velocities ...2.500 MachMaximum (2.664 Mach)! Equivalent to 3000 Ft/s @ NTP

Zero Range

Zero RangeProgram Limits: 10 to 300 m/Yard

Popup ...Do Nothing! Closes the popup without any action.Optimum Zero Range! Sets the Zero Range to give the maximum ! Point Blank Range (PBR) with the chosen ! Kill-Zone.Single Zero! Sets the Zero Range at the peak of the ! trajectory.

(4.0.8)

Scope Height

Scope HeightProgram Limits: 0.0 to 12.0 Inch

Popup ...Do Nothing! Closes the popup without any action.... various predefined scope-heights ...

Mag (Magnification)

MagnificationProgram Limits: depends on selected reticle

Popup ...Do Nothing! Closes the popup without any action.Minimum Mag ! Sets the magnification to the minimum for ! the selected reticle.Calibration Mag! Sets the magnification to the calibration ! magnification for the selected reticleBest Fit Mag! Sets the magnification of the selected ! reticle to fit the selected End Range (if ! possible; if not then the minimum ! magnification is selected instead).Maximum Mag! Sets the magnification to the maximum for ! the selected reticle.Generic Mil-Dot Calibration! Available only if the ‘Generic Mil-Dot ! Reticle’ is selected ... Opens the ‘Generic ! Mil-Dot Calibration’ applet.

Laser Height

Laser HeightProgram Limits: 15.0 to -15.0 Inch

Popup ...Do Nothing! Closes the popup without any action.Height relative to LOS! Sets the entered height relative to the ! Line-of-Sight (LOS).Height relative to Barrel! Sets the entered height relative to the ! Line-of-Departure (LOD).Show Laser Line

(4.0.8)

! Toggles the laser line ON/OFF on the POI ! Graph.

Laser Zero

Laser ZeroProgram Limits: 5.0 to 300 Yard/m

Popup ...Do Nothing! Closes the popup without any action.Zero coincides with LOS! Sets the entered zero range relative to the ! Line-of-Sight (LOS).Zero coincides with Trajectory! Sets the entered zero range relative to the ! trajectory.Show Laser Line! Toggles the laser line ON/OFF on the POI ! Graph.

Incline

InclineProgram Limits: +75 to -75 °

Popup ...Do Nothing! Closes the popup without any action.... various preset angles ...

(4.0.8)

Start Range! ! ! Start Range

Program Limits: 0 to End Range - 10 Yard/m

Popup ...Do Nothing! Closes the popup without any action.Reset to Zero! Resets the Start Range to 0 Yard/m.

End Range

End RangeProgram Limits: 10 to 300 Yard/m

Popup ...Do Nothing! Closes the popup without any action.... various preset End Ranges ...Near Zero Range! Sets the End Range to the near-zero range ! (or 10 Yard/m, whichever is the greater).Zenith Range! Sets the End Range to the range at which ! the Zenith occurs (or 10 Yard/m, whichever ! is the greater).Far Zero Range! Sets the End Range to the Far Zero Range.Max. Range! Sets the End Range to the maximum ! calculated range (usually - but not ! necessarily - 300 Yard/m).

Kill-Zone

Kill-ZoneProgram Limits: 0.0 to 12.0 Inch

Popup ...Do Nothing! Closes the popup without any action.Fit KillZone to current ZR (far Zero Range)! Adjusts the Kill-Zone to the current Zero ! Range.

(4.0.8)

Energy! Energy

Program Limits: none

Popup ...Do Nothing! Closes the popup without any action.Changing Energy changes Velocity! Changing the Energy value changes the ! Muzzle Velocity value (constant projectile ! weight).Changing Energy changes Weight! Changing the Energy value changes the ! Weight value (constant Muzzle Velocity).

Clicks per MoA (Scope clicks calibration)

Clicks per MoAProgram Limits: 1.0 to 100.0

Popup ...Do Nothing! Closes the popup without any action.... various pre-defined values ...Click Calibration! Opens the ‘Click Calibration’ applet (see ! ‘Applets’ below).

Wind Speed

Wind SpeedProgram Limits: 0 to 60 MPH

Popup ...Do Nothing! Closes the popup without any action.... various pre-defined indicators ...

(4.0.8)

Wind Angle

Wind AngleProgram Limits: 0 to 359 °

Popup ...Do Nothing! Closes the popup without any action.... various pre-defined angles ...

Tables and GraphsTable Popup

Do Nothing! Closes the popup without any action.Ballistics ! Presents a table of trajectory & ballistics ! detailsWindage! From the sub-menu choose to print the wind-drift ! of the current trajectory in terms of Units (Inch or ! cm), Minutes of Arc, Clicks, Mil-Dots (if the current ! reticle is a Mil-Dot type) or milliradians (mills) - or ! all of the above.Click Values! A table of near and far intercept ranges !versus ! click valuesGraph Values! A table of what ever is currently being displayed ! on the graphPrint Table! Print the current tableSave as CSV file! Save the current table as a .csv file suitable for ! spreadsheet analysisShow every (Yard/Metre) ...! Increment current table by 1, 2, 5,10,25, 50 or 100 ! Yard/m.

(4.0.8)

Graph PopupDo Nothing Closes the popup without any action.Point of Impact Point of Impact (POI) v. selected Range.Velocity>Absolute Absolute Velocity v. selected Range.Velocity>Retained Velocity relative to muzzle velocity v. selected range.Windage Wind drift at current windspeed and wing angle values v. current range.Elapsed Time Elapsed (flight) time v. current range.Drop from LoD Vertical drop from horizontal line of ! departure v. current range.Kinetic Energy>Absolute Kinetic energy v. current range.Kinetic Energy>Retained Kinetic Energy relative to muzzle energy v. current range.Momentum>Absolute Momentum v. current range.Momentum>Retained Momentum relative to muzzle energy v. current range.Minutes of Arc (MoA) Trajectory deviation from LoS (in MoA) v. current range.Clicks Trajectory deviation from LoS (in Clicks at he current clicks/MoA’setting) v. current range.Mil-Dots Trajectory deviation from LoS (in Mil-Dots at the current Calibration and physical magnification) v. current range. Only accessible if a Mil-Dot reticle is currently selected.Laser Holdover Displays the relationship between laser and trajectoryPenetration Penetration using the Poncelet/Steve_NC expressionBallistic Profiles>All Profiles Displays all (6) ballistic profiles v. velocity Ballistic Profiles>Current Profile Display the currently selected ballistic profiles v. velocity (in Mach & Ft/s or m/s).Print Graph

(4.0.8)

Prints the current graph to an attached !printer.Save as JPG Image Saves the current graph as a JPG Image.

Reticle ViewsReticle views display the current reticle information in different ways depending on requirement. The Reticle Views are opened/reopened from the Toolbox main menu. None of the views can be resized on the screen but they can be moved about by left-clicking on the face of the view and dragging it into position. The background gradient can be switched ON/OFF via the Colour Gradient on Tables/Graphs’ option of the ‘Embellishments’ main menu.

Reticle ViewDisplays the current reticle with Trajectory intercepts superimposed together with the relevant ballistics data in the top left-hand corner.A popup menu (right-click) gives options:Switch Rounding ON/OFF! Rounds the far ranges to the nearest 5 Yards/! Metres. Not available if the furthest distance ! displayed on the reticle is less than 100 Yards/! Metres.Show MoA Peak! Indicates the MoA peak range on the reticle.Reticle Lefthand Side! The sub-menu determines what is to be displayed ! on the lefthand side of the Reticle (and Scope ! Cap) views.Print Reticle! Print the Reticle image to an attached printer.Save as JPG Image! Save the Reticle image as a JPG fileClose! Remove the Reticle View from the screen. It can ! be opened again via the Toolbox main menu.

Scope Cap View

Displays the current reticle with Trajectory intercepts superimposed in a format suitable for fitting into/onto a scope-cap. The printed (and JPG Image) diameter is controlled by the textboxes at the bottom of the view.A popup menu (right-click) gives options:Print Scope Cap! Print the Scope Cap image to an attached printer.Save as JPG Image! Save the reticle image as a JPG file.Close! Remove the Scope Cap View from the screen. It can be ! opened again via the Toolbox main menu.

(4.0.8)

Right-Clicking on the ‘Range colour’ or ‘Zero Colour’ labels opens a popup menu where the colours of the ranges can be changed.

Rangefinder ViewsUniversal Rangefinder View

Displays the current reticle with range finding intercepts with regard to a Magnification and Target Size - both of which can be adjusted via the textboxes.A popup menu (right-click) gives options:Print Rangefinder! Print the Rangefinder image to an attached printer.Save as JPG Image! Save the Rangefinder image as a JPG file.Close! Remove the Rangefinder View from the screen. It ! can be opened again via the Toolbox main menu.

SR Rangefinder

Available only when an SR6 or SR12 reticle is currently selected, the SR6/SR12 rangefinder mimics the rangefinder feature available on the SR reticles.The SR6 reticle as calibrated @ 6.0x whereas the SR12 reticle is calibrated @ 12.0x. Alter the magnification and the required target size (in Inches and millimetres) using the textboxes provided.The popup menu (Right-click) has options to print the rangefinder image, save it as a JPG image or close the applet.! Note that Selecting the ‘close’ option will turn OFF the ‘Show Rangefinder Automatically’ item in the Configuration Menu.

SR Pro Rangefinder

Available only when the SR Pro reticle is currently selected, the SR Pro rangefinder mimics the rangefinder feature available on the SR Pro reticles.The SR Pro reticle as calibrated @ 8.0x. Alter the magnification and the required target size (in Inches and millimetres) using the textboxes provided. The popup menu (Right-click) has the same options as the SR Rangefinder above.

(4.0.8)

Deer PASS Rangefinder

Available only when the Deer PASS SR reticle is currently selected, the Deer PASS SR rangefinder uses the reticle dimensions to estimate ranges via three target sizes - 2”, 12” and 36”.The Deer PASS SR reticle as calibrated @ 6.0x. Two modes are available: where changing the magnification changes either the target sizes or the ranges. In both cases, the range equivalents to the shown target sizes are displayed next to the horizontal ranging bars.Alter the magnification using the textbox provided. The popup menu (Right-click) has the same options as the SR Rangefinder above.

Mil-Dot Rangefinder

! Available only when a Hawke 10x or 20x 1/2 Mil-Dot ! reticle is currently selected, the Mil-Dot rangefinder ! displays the reticle features against target ranges at the ! selected target size and magnification.

The Hawke 10x 1/2 Mil-Dot reticle as calibrated @ 10.0x whereas the Hawke 20x 1/2 Mil-Dot reticle is calibrated @ 20.0x. Alter the magnification and the required target size (in Inches and millimetres) using the textboxes provided.The popup menu (Right-click) has the same options as the SR Rangefinder above.

(4.0.8)

AppletsApplets are sub-applications - opened from the main ChairGun4 application - designed for one specific function.The gradient colour of particular applets refers to the dataset (tab) on which it is operating whereas, if the background is graduated grey, it reflects a system-wide function (e.g., Environment, About, etc.).

Trajectory Visualization View

Displays the selected reticle with the trajectory superimposed.A popup menu (right-click) gives options:Show/hide Target! Shows or hides a target ! (based on the current End ! Range value).Show/hide Data! Shows or hides the ballistics ! data in the top lefthand corner.Show Grid! This option is available only ! for Mil-Dot reticles.Show every (yard/metre)! Don’t show Ranges! ... various increment ! settings ...Print Reticle! Print the Reticle image to an ! attached printer.Save as JPG Image! Save the Reticle image as a ! JPG file.Close! Remove the Rangefinder View ! rom the screen. It can be ! opened again via the Toolbox ! main menu.

Text boxes are provided (in both Inches and mm) to change the target size - changing the apparent size of the target on the applet - whereas the target range (corresponding to the End Range), wind speed and angle are changed via the textboxes of the main application.

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BC Calculators:

The choice of BC calculator will depend to a very large extent on the equipment available. An accurate Chronograph is always required to measure Muzzle Velocity but, additionally, to calculate BC from Velocity Difference, a second - equally accurate - Chronograph will be required. Calculating the BC by measuring the POI at a distant range can give results good enough for practical use although it is very sensitive to the POI measurement whereas BC calculations using the ‘Time to Target’ method are probably best attempted if you have access to a recording oscilloscope and a sensitive microphone. Alternatively, adequate results can sometimes had by using a stopwatch ...All BC calculation applets use the currently selected ballistic profile.Note that the values in the various textboxes are initially copied from the main application and will probably need to be changed before the calculation is performed.

Calculate BC from Velocity Difference

Enter the realMuzzle Velocity, the velocity at the target (V2) and the distance between the chronographs. Click on the ‘Calculate’ button to perform the calculation then the ‘OK’ button to accept the new BC value or the ‘Cancel’ button to reject the calculation and close the applet.

Calculate BC from Point of Impact

Enter the real Muzzle Velocity, Scope Height, Zero Range, Target Range and measured POI in the appropriate textboxes. Click on the ‘Calculate’ button to perform the calculation then the ‘OK’ button to accept the new BC value or the ‘Cancel’ button to reject the calculation and close the applet.

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Calculate BC from Elapsed Time

Enter the real Muzzle Velocity, Target Range and either the measured Time-to-Target or the ‘Round Trip’ time (the elapsed time between the shot and the target impact as heard from the shooting position) in the appropriate textboxes. Click on the ‘Calculate’ button to perform the calculation then the ‘OK’ button to accept the new BC value or the ‘Cancel’ button to reject the calculation and close the applet.

Generic Mil-dot Calibration

The ‘True Mil-Dot Magnification’ is that magnification at which the projected distance between adjacent Mil-Dots is 36 Inches at 1000 Yards ... or, by similar triangles, 3.6 Inches at 100 Yards, or 1.8 Inches at 50 Yards, etc.To use the applet; position a suitable ruler at a known (measured) distance and view it through the scope.Jot down the magnification setting of the scope and record the apparent distance between any two Mil-Dots - the greater the number of Mil-Dots spanned, the better the accuracy to be expected.Enter the Range, the Scope’s magnification setting, the number of Mil-Dots spanned and the apparent vertical distance between the chosen dots into the applet to see the True Mil-Dot Magnification’ - in this instance, also known as the Calibration Magnification.Click on the ‘OK’ button to accept the value or on the ‘Cancel’ button to reject and close the applet.

Scope Clicks Calibration

Position a ruler at a suitable range (longer ranges yield better accuracy) and carefully clamp your rifle/scope securely such that the cross-hairs are positioned and focused on some reference point on the downrange ruler.Rotate the elevation knob through one or two whole turns and note how far the ruler image has moved with reference to the scope’s crosshairs.Return the scope’s elevation setting to normal again, check the alignment on the ruler and turn the elevation knob again - maybe two or three turns.Jot down the vertical difference observations and enter them - together with the respective number of clicks and the range - into the applet.

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The corresponding ‘Clicks/MoA’ will then be calculated.Click on the ‘OK’ button to accept the value or on the ‘Cancel’ button to reject and close the applet.

Scope Shims Calculator

Optical centering ...Remove the scope from the rifle and rotate it on two suitable wooden V-blocks, adjusting the elevation and windage controls until the crosshairs remain in the centre of the view regardless of the rotation. Refit the scope and shoot at a target positioned at your desired (far) Zero Range. Measure the vertical distance between the aim-point and the point-of-impact (the ‘Vertical Distance’). Measure the distance between the centers of the scope mounts (‘Mount Span’) and the Target Range (‘Range’) and enter the values into the appropriate textboxes of the Scope Shims applet. The calculation will indicate the difference required between the front and rear mount heights. This could be achieved by adding a suitable shim under the scope tube (FRONT or - usually - REAR mount as indicated) or by suitably adjusting an adjustable mount. The latter option is always to be preferred.

Maximum Parallax Error Calculator

Parallax Error - in this context - refers to the apparent displacement of the target with regard to the reticle.There is no parallax error if the scope is focused on the target OR the target is viewed along the optical axis of the scope. However, in an imperfect world, there are situations when the target and focus are different (e.g., HFT where the scope cannot be re-focused between shots) or when normal eye positioning cannot be guaranteed.The Maximum Parallax Error Calculator indicates - for any Focus Range, Target Range and Objective Diameter combination - the maximum parallax error that can occur. Note that this is a Maximum value; in practice, eye-relief considerations may dictate that the image may ‘white-out’ before the indicated error is realized.

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Environment

This applet accepts values that are used throughout ChairGun4 and affect the calculations to a greater or lesser degree.Enter the ambient temperature (in Centigrade or Fahrenheit degrees - altering one converts and changes the other) and either the ambient pressure (if known) or the altitude.The Relative Humidity can be adjusted - between 0% and 100% - using the Relative Humidity textbox.Clicking on the ‘Reset’ button resets the ambient conditions to Normal Temperature and Pressure (NTP) i.e., 20 °C (= 68 °F), 29.95”Hg and 0 Ft. (sea-level) altitude.Click ‘OK’ to accept any changes, ‘Cancel’ to abandon them.

Statistics

The Statistics applet displays shot-string data and performs rudimentary statistical operations on it. The raw data is displayed on the left-hand ‘Velocity v. Shot Count’ graph and the frequency of repeated velocities on the optional right-hand histogram panel.Raw data is entered and/or edited in the left-hand editor window and the panel below the graphs displays the computed data for both the entire dataset and any subset defined by the textboxes in the button left-hand corner.The File menu gives options:Open ... ! Open an existing dataset.Save! Save the current dataset.Save As ...! Save the current dataset under a different ! name.Save Graph as JPG Image! Saves the current graph (including the ! histogram if required) as a JPG file.Print Graph! Prints the current graph to a local printer.Save Data as CSV File! Saves the current dataset to a .CSV file.Close! Closes the applet.The Histogram menu has only one item - ‘Toggle Histogram on/off’ - used to display/hide the histogram.

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PCP Efficiency

The PCP Efficiency applet indicates - in terms of bar-cc/Ft.Lbf - the amount of high-pressure air used per Ft.Lbf of Kinetic Energy per shot. Lower values indicate better energy conversion that higher ones.The applet also displays the notional (simplistic) efficiency of the system, i.e., the potential energy converted for ‘n’ shots divided by the total potential energy available.

The ‘Units’ menu allows selection of the units used for pressure (Lbf/in² or bar), volume (in³ or cc) and Kinetic Energy (Ft.Lbf or Joule)

Quick Zero

The applet opens with the ‘Range’ textbox set at the current zero range - but this can be changed as appropriate. Simply left-click on the grid to indicate the position of impact with respect to the centre black target and the ‘Elevation:’ and ‘Windage:’ labels indicate the appropriate correction (in clicks at the current click/moa setting) and the direction.A right-click popup menu gives options to print the QuickZero image, save it as a .JPG image file or close the applet.

!

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Pressure Vessel Fill Calculator

This applet calculates the number of PCP reservoir fills that can reasonably be expected from a given pressure vessel and charging gear.The ‘Capacity’ textbox is only really useful for USA users; the rest of the world use the actual volume (‘water volume’) instead.Enter :the Pressure Vessel values: Volume (Litres) and the fill pressure (Bar),the internal volume of the Charging Gear (cc), andthe PCP cylinder parameters: Volume (cc), the pressure to which it is refilled (Max. Pressure (Bar)) and the refill pressure (Bar).The number of full charges is indicated as well as the pressure remaining in the pressure vessel (Bar).The table displays the pressure remaining in the pressure vessel after each fill (in Bar and psi), the percentage of air wasted in the charging gear and the popup has options to:

Do Nothing! Closes the popup without any action.Print Fill List! Print the table as displayed.Save List as .CSV File! Save the list for subsequent analysis.

Range Cards

This applet displays a simple range card of the current trajectory parameters in the units of choice, i.e., POI, Clicks, MoA, Mils (milliradians) or, if a Mil-Dot reticle is currently selected, Mil-Dots.The size of the output printed range card is specified with the Width and Height textboxes (up to a maximum 6 x 6 Inches).For the content; specify the minimum and maximum ranges to appear on the card together with the increment (Step) size.Clicking the ‘Print’ button sends an image of the specified size to the printer whilst clicking on the ‘Close’ button closes the applet.

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Maximum Range Calculator and display

The opening page of the ‘Maximum Range’ applet displays the ballistic envelope of the current Muzzle Velocity, Ballistic Coefficient and Cd Profile setup in terms of Altitude v. Range for inclinations between 0 and 90° - the angle for Maximum Range being marked in red.A popup menu (right-click) gives access to other graphs each expanding on various specific aspects of the ballistic envelope:Ballistic Envelope! As described above.Maximum Range! Maximum Range v. Inclination Angle.Maximum Height! Maximum Height v. Inclination Angle.Elapsed Time! Elapsed Time v. Inclination Angle.Terminal Velocity! Terminal Velocity v. Inclination Angle.... and items to ...Print Graph and to save the Graph image as a JPG file.

Clicking on the ‘Table’ tab displays a table of envelope-related data with a popup to:Do Nothing! Closes the popup without any action.Print Table! Print the table to an attached printer.Save as CSV file! Save as the table as a CSV file for analysis.Show every ...! various increments to display the table.

The ‘OK’ button closes the applet.

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Scope Tape Generator

Generates a simple scope-tape for the currently selected trajectory.Enter the scope knob’s diameter and height and the number of clicks/revolution of the elevation knob. Set the ‘Turns’ value at 2 to start. Next, choose a ‘Numbering Scheme’ ...choose from:Step: a user specified increment,Odd Ranges: 1, 3, 5, 7 etc.,Even Ranges: 2, 4, 6, 8 etc., orCustom: edit the ranges in the textbox leaving a single space between each value.

Increase the ‘Turns’ value until the label contains the longest range required.

Change Text and background colours by:a) selecting the radio-button corresponding

to the Turn to be altered,b) selecting the appropriate ‘Text’ or ‘Back’

radio-button, andc) clicking on the colour swatch to choose

the required colour.

The label can have it’s text size altered to fit, made bold and/or italic and the click lines can be shown or hidden. The whole tape can be reversed if necessary for some scopes.Click the ‘Print’ button (or select ‘Print Scope Tape’ from the label’s popup) to print the tape, the ‘Save as Image’ button (or the popup item) to save the tape image as a JPG file and the ‘Close’ button to exit the applet.

Crosswind Analysis

Describes how the path of the current projectile would be affected by various crosswind intensities at various ranges.A popup menu has options:Do Nothing! Closes the popup without any action.Print Graph! Print the graph to an attached printer.Save as JPG Image! Save the graph as a JPG Image.

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Clicking on the Table tab displays a table of the graph values; lateral drift at various ranges and crosswind intensities.

A popup menu has options:Do Nothing! Closes the popup without any action.Save Table as CSV file! Save the table as a CSV file for ! subsequent analysis.Show every ...! Select the table step increment.

Clicking the ‘Close’ button closes the applet.

Tab Details Editor

Select the appropriate Tab detail to change and edit the text accordingly.Click the ‘OK’ button to save any changes or the ‘Cancel’ button to abandon them.

Combo Details Editor

Select the appropriate Combo detail to change and edit the text accordingly.Click the ‘OK’ button to save any changes or the ‘Cancel’ button to abandon them.

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Colour Scheme Editor

Select the radio-button corresponding to the Tab to edit from the top horizontal row and the particular item to change from the vertical column.Click on the colour-swatch to change the item’s colour as required.

The ‘Cancel’ button abandons any changes whereas the ‘Reset’ button changes the whole colour scheme to the original state.The ‘OK’ button accepts any changes made.

About ChairGun4

The ChairGun4 About applet gives system details in the scrolling textbox:

Software: ! the application name, version, ! compilation build and current ! installed location.User:! name and the location of the home ! directoryLocal Machine:! O/S, version, architecture, screen ! size and the presence of an Internet ! connection.File System:! The location and enumeration of ! Data, Image and CSV Files on the ! local machine.

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Pellets Database

As mentioned above, the pellet database is opened by clicking on the ‘Pellet:’ item beneath the first Tab. Left-clicking opens the database with the current pellet diameter whereas a right-click will present a popup menu from which the pellet category can be chosen.

Scroll up and down to find and select a pellet of choice. Note that the database can be sorted on any of the available fields by clicking on the appropriate header (Calibre, Name,BC, Weight and WSF). Clicking again on the same header toggles the sort between ascending and descending modes.A single click highlights the record (as opposite). Clicking the ‘OK‘ button accepts the pellet into ChairGun4 and closes the database. The ‘Cancel’ button closes the database leaving the current pellet selection unchanged.

Clicking the ‘Add’ button presents and selects a new record with average values for Calibre, BC, Weight and WSF and the name set to ‘Un-named 0.177 Pellet’. This record can then subsequently be edited by first double-left-clicking on

! ! ! ! ! ! ! ! subsequent fields in and editing the ! ! ! ! ! ! ! ! contents.

The WSF field cannot be edited as it’s calculated n the basis of the BC and Weight fields.

The ‘Delete’ button deletes the current - selected - record.

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Update Pellet Database

If an Internet connection is found then ChairGun4 will access a file on the Hawke Optics server containing updated or new pellet/projectile records that have been added after the current release. Internally, the update file is downloaded and analyzed such that any new records that don’t appear in your local database are presented for inclusion.The ‘’ button accepts all of the new (unique) records into the database and closes the applet although individual records can be accepted simply by double-left-clicking on the particular item of interest.

If there are no new unique records on offer then then the applet makes this clear.

Clicking the ‘OK’ button closes the applet.

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Custom Profile Editor

The Profile Editor opens showing the current custom profile - CustomProfile.pro is the default - but an existing profile can be selected from the File menu as required.The profile can be modified in a variety of way to fit your data. These are:Individual zones: ! Left-click on the graph to highlight (in orange) the zone of interest (the 0.4 Mach zone is shown on the diagram) then either enter a new value in the Zone Adjustment or, hovering the mouse-pointer over the textbox, scroll the value up/down with the mouse-wheel. Note that the yellow area defines the range of velocities consistent with the particular dataset selected in the main app. Selecting and adjusting the Cd value of a Zone outside of the yellow area will have no effect on the trajectory.

Overall Level Adjustment: ! Click on the + or - buttons or, positioning the mouse-pointer over the graph area, scroll the level up/down using the mouse-wheel to increase the Cd value of the whole profile.Note that if the main app is currently a graph then the effect of any adjustment is shown in real time. Likewise, if the Reticle View, ScopeCap View and/or the Visualisation View and/or the ScopeTape applet is displayed the trajectory changes will be apparent.

Buttons:! Cancel:! ! returns the Custom profile in use to ! ! the original custom profile and ! ! closes the applet.! Use:

! ! Accepts any changes, saves the ! ! profile and makes the profile (as ! ! shown in the graph and title bar) the ! ! current Gx selection.

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File Menu:has options to:! Open:! ! opens an existing profile (.pro) file.! Save:! ! saves the contents of the current ! ! graph (altered or not) to the ! ! filename shown in the title bar.! Save As ...! ! saves the current configuration ! ! under a user-supplied filename.! Print Graph:! ! Prints the current custom profile to ! ! an attached printer (if any).! Save As JPG Image:! ! saves the current custom profile ! ! graph as a .JPG file.! Quit:! ! as the ‘Use’ button above.

Profile Menu:! Reset To: ! ! resets the curve (shown in red) to ! ! any of G1, GA, GL, GS, RA4, GC or ! ! a basic flat curve (@ Cd = 0.500).

! Show Base Profile:! ! displays a guide base curve (shown ! ! in blue); any of G1, GA, GL, GS or ! ! GC.

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Glossary

ApogeeThe highest point in the pellet's/bullet's trajectory. Sometimes known as the Zenith or Peak.

Ballistic Coefficient (BC)A measure of aerodynamic efficiency. Primarily varying with the projectile’s sectional density, the BC value is altered to some extent by its shape (or form). BC values - regardless of their actual Ballistic Profile - are expressed in terms of the G1 profile within the BRC2 software. The units of the Ballistic Coefficient are the same as Sectional Density (Lbf/in² aka psi) although these are rarely stated explicitly.

Ballistic ProfileThe characteristic curve of Drag Coefficient v. Velocity for a particular projectile form. For various reasons, the G1 profile is generally used for comparison purposes although assuming G1 for every projectile shape may not give optimized results.

Drag Coefficient (Cd)The Drag Coefficient is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment - air in the case of External Ballistics. Se Ballistic Profile above.

Exterior BallisticsThe study of the projectile in flight between muzzle and target.

Interior BallisticsThe study of the projectile while still restrained by the barrel.

Line of Sight (LOS)The imaginary line between the scope and target (POA)

Line of Departure (LOD)The imaginary line (corresponding to the bore centre) along which a projectile first emerges from the muzzle.

Muzzle Velocity (MV)The velocity of a projectile (pellet, bullet or arrow) as it emerges from the muzzle. Measured as Feet per second (Ft/s) or Metres per second (m/s).

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http://en.wikipedia.org/wiki/Dimensionless_quantity

http://en.wikipedia.org/wiki/Dimensionless_quantity

http://en.wikipedia.org/wiki/Drag_%28physics%29

http://en.wikipedia.org/wiki/Drag_%28physics%29

Scope Height (SH)The scope height is the distance between the line-of-sight and the line-of-departure measured at the muzzle, i.e., where the trajectory begins.

Terminal BallisticsThe study of the projectile after it has hit the target.

TrajectoryThe arc of a projectile through the air from muzzle to target.

Point Of Aim (POA)The intended impact point on a target.

Point Of Impact (POI)The point on the target where the pellet/bullet strikes or, in this context, the vertical distance between the point of impact and the point of aim.

Zero(ed) Range (ZR)The point at which the pellet/bullet/arrow crosses the Line of Sight. In most cases there will be two such points; confusingly, the furthest from the muzzle is usually called the Primary Zeroed Range whilst the nearer point is often called the Secondary Zeroed Range. If there is only one point then this, by definition, corresponds to the point where the Apogee (above) is zero (i.e., lies on the LOS).

________________________________________________________________________Hawke is a registered trademark. © Deben Group Industries Ltd, 2012

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