1 ME 442 Senior Project Week 4 Dr. Joseph Vignola Pangborn G43, Phone 202-319-6132,...

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ME 442 Senior Project Week 4

Dr. Joseph VignolaPangborn G43, Phone 202-319-6132, [email protected]

Tuesdays & Thursdays, 9:35-12:25 AM, Pangborn G43

Office Hours: Tuesdays, 1:00-2:00 PM

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Word of the DayDo you know the word obfuscate ?

Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html

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Please don’t obfuscate

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Please don’t obfuscateIf a question start withHow many…?

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Please don’t obfuscateIf a question start withHow many…?

The answer should include a number

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DocumentationPlease bring all your electronic files everyday

SolidWorks drawings


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SolidWorks drawingsExcel budget


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SolidWorks drawingsExcel budget, must be this version or have this information


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SolidWorks drawingsExcel budget, must be this version or have this information

Item(s)Date of purchaseSupplierDate receivedTotal cost (items + shipping and anything else)Who’s credit was used Name of the receipt pdf file

One line per transaction


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It’s best to use the document that I started

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It’s best to use the document that I startedIt’s on the class web page

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Budget Document From here forward you must use my version of the document

The reason is that many of you:

•Made addition mistakes•Didn’t include important information like the date of the purchase and the name of the company you made the purchase from.

Remember:

•One line per transaction


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Budget Document From here forward you must use my version of the document

The reason is that many of you:

•Made addition mistakes•Didn’t include important information like the date of the purchase and the name of the company you made the purchase from.

Remember:

•One line per transaction not one item


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PurchasesI need to see the Excel budgets today and everyday

I want to be sure we are keeping careful track of all expenses.


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Materials and PurchasingIt is very import that we straighten the budget today

We have $1630.32 of unattributed expenses related to Senior Design.


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We have $1630.32 of unattributed expenses related to Senior Design. This is January only


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Ms. Hicks

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Ms. HicksYou want her on your side

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There will be problems with the credit card


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From now own I must approve all purchases


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Ask Ken to bring specific material you need


MNEY

Ken

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Dimensioning lumber


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Dimensioning lumber

e-mail Hong right away to schedule time

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Dimensioning lumber

e-mail Hong right away to schedule timeShe will help you.

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Machine ShopPlease work with Don, Hong or anyone that has built things

Show them sketches of ideas and be open to new ideas

This will make it easier for you


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Machine ShopPlease work with Don, Hong or anyone that has built things

Show them sketches of ideas and be open to new ideas Simplify your design

Settle on the details


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Assignment 2Fix assignment 1

A number of groups did not submit assignment 2 or didn’t really update anything


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Toolbox Please just list what you need to carry to the airfield.

Glue that take overnight to dry is probably not appropriate for that list but cyanoacrylate glue (Superglue) is

You should know what each screw is for


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You should know what each screw is forPlease don’t list random items


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You should know what each screw is forPlease don’t list random items ¼” screws


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You should know what each screw is forPlease don’t list random items ¼” screws, a hammer


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You should know what each screw is forPlease don’t list random items ¼” screws, a hammer, weed wacker


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Ask Jason, Hong, Ken or me what you really need


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Money

Lets start with the group that has the most people here


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Money

Thanks for the help resolving the credit card issues


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Flight Testing

Jim and Ed want to test Monday, Feb 24


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Flight Testing



I’m still working on this

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Flight Testing



S M T W Th F S

6 Today 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 Flight Test

25 26 27 28 29

I’m still working on this but the big issues is

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Flight Testing



…and you have to do the taxi test and technical inspection before the flight test


S M T W Th F S

6 Today 7 8

9 10 11 12 13 14 15

16 17 18 tech insp taxi test

19 20 21 22

23 24 25 Flight Test

26 27 28 1

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Flight TestingI’m hoping that Ken will schedule and do the technical inspection and taxi tests with you


…and you have to do the taxi test and technical inspection before the flight test

S M T W Th F S

6 Today 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 Flight Test

25 26 27 28 29


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So Given the Calendar

Work with Ken, Hong, Don, and Me


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Money

Thanks for the help resolving the credit card issues

Today we can start with group ?


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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue


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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue You can make a part bigger then the travel range of the CNC machine


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Ken brought enough wood for everyone


Ken

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Ken brought enough wood for everyone

Purchase always come through as hoped


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Myths and TruthsTruthsRound holes are easier to make then not round holes


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Myths and TruthsTruthsRound holes are easier to make then not round holes

Hong needs some sleep


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You need to know where the CG isWeighted averages.

x

y

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Mass and Aerodynamic Centers Weighted averages.

x

y

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Mass and Aerodynamic Centers Weighted averages. Pick an origin

x

y

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Mass and Aerodynamic Centers Weighted averages. Pick an origin, make a table

x

y

component Mass (kg) x-location (cm)

engine 0.45 -3

fuselage 2.1 75

Wing 2.3 27

Front landing gear 0.35 12

Rear landing gear 0.64 34

Fuel tank 0.33 8

Radio reciever 0.25 7

tail 0.75 150

Payload

Total 7.17 319

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Mass and Aerodynamic Centers Weighted averages. Pick an origin, make a table

x

y

component Mass (kg) x-location (cm)

engine 0.45 -3

fuselage 2.1 75

Wing 2.3 27

Front landing gear 0.35 12

Rear landing gear 0.64 34

Fuel tank 0.33 8

Radio reciever 0.25 7

tail 0.75 150

Payload

Total 7.17 319

51.2 cm

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Mass and Aerodynamic Centers Each component that is exposed to the exterior flowHas a net drag force that acts on that component

The magnitude of that force is

51.2 cm

These drag forces occur at specific locations

These location must be determined

Once you have them

x

z

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Mass and Aerodynamic Centers Each component that is exposed to the exterior flowHas a net drag force that acts on that component

The magnitude of that force is x

z

51.2 cm

These drag forces occur at specific locations

These location must be determined

Once you have them

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Mass and Aerodynamic Centers

x

z

51.2 cm

Once you have them…

DRAW A FREE BODY DIAGRAM

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Mass and Aerodynamic Centers Once you have them Then sum forces andmoments

mg

thrust

Wing drag

tail drag

fuselage drag

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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Mass and Aerodynamic Centers This summing for moments is precisely the same as the weighted average

x

z

51.2 cm

component Net drag (N) z-location (cm)

x-location (cm

fuselage 2.7 5 44

Wing 15.3 17 45

Front landing gear

3.5 -12 34

Rear landing gear

5.8 -11 76

tail 13.7 21 125

Total 40.7

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You MUST include this informationThis summing for moments is precisely the same as the weighted average

x

z

51.2 cm

component Net drag (N) z-location (cm)

x-location (cm

fuselage 2.7 5 44

Wing 15.3 17 45

Front landing gear

3.5 -12 34

Rear landing gear

5.8 -11 76

tail 13.7 21 125

Total 40.7

So have a figure with YOUR plane, a coordinate system, and the location of the centers

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Design to Meet ObjectivesThe objectives are requirements and constraints

Requirements and constraints are separate

Requirements: what you are expecting from the full system or subsystem

Constraints: what you are stuck with

They must be specific

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Landing gear must be strong enough

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Landing gear must be strong enough

Must remain elastic for 3 f/s vertical fall will transferring less that a 2 g impulse to the fuselage

Requirements and ConstraintsThere MUST be requirements and constraints for the plane itself Every subsystem MUST have bulletined requirements and constraints listed separately

The should have numbers and be specific

Fuselage RequirementsHold: 4 cell battery (based on 6 minute flight)z57 model radio receiver (with link to data sheet)27 lbs payload at plane’s unloaded CG and wing’s CLRemovable wing mount able to transfer 42 lbs from wing to fuselage. Engine mount within ± ½ in of current estimate of plane’s aerodynamic centerTransfer 2 x planes full weight (84 lbs) to landing gear…

Support 2.5 lb horizontal force generated by tail with rudder at full deployment…

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ME 442 Senior Project Week 3

Dr. Joseph VignolaPangborn G43, Phone 202-319-6132, [email protected]

Tuesdays & Thursdays, 9:35-12:25 AM, Pangborn G43

Office Hours: Tuesdays, 1:00-2:00 PM

Week 3

Build

Week 3

Please email your t-shirt size to Ms. Hicks and Nicole Bull

[email protected]

Today I would like to see Excel budgets

1 ME 442 Senior Project Week 4 Dr. Joseph Vignola Pangborn G43, Phone 202-319-6132,...

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