Mallo Rapid Protractors Manual2

7/25/2019 Mallo Rapid Protractors Manual2

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MALLO RAPID PROTRATOR

General

The Mallo Rapid Protractor (MRP) is a fire control instrument designed to aid the

Squad Leader or Fire Direction Center operator in plotting targets and computing firingdata. t consists of protractor and a range arm. This fire control instrument is a light

!eight" #er$ simple to operate" fast and accurate. t is easil$ adapted and suita%le to

use in the field under undesira%le atmospheric condition especiall$ for the maneu#er

unit.

Description of Mallo Rapid Protractor

a) Protractor

& is made of acr$lic plastic in a half circle form !ith a range armattach to the other side. The Range arm scale and deflection scale is engra#e in a clear

acr$lic plastic.& Deflection scale is engra#e at the outer side of the protractors arc

!hich is di#ided into equal parts" '*++ mils units of angular measurement. ,ne

graduation is '+ mils and la%eled in e#er$ '++ mils from '-++ mils to **++ mils. The

common (referred) deflection of this protractor is from '-++ mils to **++ mils. This is

the most practical Referred deflection used in la$ing the mortar or plotting in the plotting

%oard in the field.

b) Range arm& Rang arm Scale ('-/"+++ meters) is engra#e from the center of

the protractor (mortar position) out!ard and graduated in /+ meters and la%eled e#er$

'++ meters mortar position (#erte0) + to */ in hundred of meters.

c) Vertex

& 1erte0 is the point of origin or represent the mortar position

!hich the range start this point.


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DIRET !IRE PROED"RE#(Target is #isi%le from Mortar Position)

Proced$ren com%at situation the normal emplo$ment of +mm mortar is %$

indi#idual squads directl$ control %$ the squad leaders. The squad leader o%ser#es thetarget area from the o%ser#ation post (,P) and control the fire %$ issuing fire commands

directl$ to the mortar cre!s %$ means of #oice or radio.

Steps 2ction

'

3hen enem$ is identified" the mortar cre! should %e in partial defilade. This

gi#es good protection from enem$ direct fire !eapon. The squad leader !ill

mo#e to ad#antage position and act as for!ard o%ser#er and computer for his

squad.

-Squad Leaders gi#es an order (%$ #oice or radio) 4Squad refer direct la$"engage enem$ camp direction '- ,5cloc6" range /++.

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The gunner and assistant gunner !ill la$ the mortar to the target !hile ammo

%earers pro#ide securit$ for the squad. The gunner la$s the mortar for deflection

(7-++ mils) and ele#ation (''++ mils). Then announce 4 8988L:S 9P for

le#eled %u%%les" and ;9< 9P for gun is read$=

* Then he gi#es his command 4 Squad refer direct la$" engage enem$ camp" one

round" >.:. quic6 charge -" ele#ation '+-+" fire !hen read$.=

/Then he construct the emergenc$ firing chart on an$ flat surface suita%le to

accommodate the MRP and map pins.

The squad leader places the MRP at the center of the plotting surface.

? ,rient the MRP to the general direction as announce %$ the squad leader.

@Place a map pin in the #erte0 of the MRP. This pin represents the mortar

location.

A

3ithout mo#ing the MRP" esta%lish the deflection inde0 %$ placing the map pin

opposite to the graduation on the protractors arc that represents the

commonreferred deflection.

'+nsert a map pin through the center of the target grid.

'' 3ithout mo#ing the MRP place the pin !ith target grid attach to the range arm


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opposite to the range to the target.

'- Mo#e the MRP to allo! the target grid rest to the plotting surface.

'7 Mo#e the MRP until the arm is against the pin mar6ing the target location.

'*2llo! the arro! (+&7-++ line) on the target grid so that it is parallel to the arm ofthe MRP. The head of the arro! should point a!a$ from the #erte0 of the MRP

along the ;un Target Line.

'/Place a pin opposite the target grid graduation corresponding to the Direction of

fire (Mounting 2Bimuth). This represents the north inde0 of the target grid.

'

Rotate the target grid until the announce ,%ser#er direction align to the north

inde0 pin. The target grid is no! properl$ oriented for the plotting of the

o%ser#ers correction" place additional map pin to fi0ed the target grid.

'?Plot the Left or and 2dd or Drop correction %$ measuring the num%er of squarefrom target location. :ach square on the target grid is equal to '++ meters and

can %e #isuall$ interpolated to the nearest '+ meters.

I%DIRET !IRE PROED"RE


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(Target is not #isi%le from Firing 9nit)

:quipments used in indirect fire procedure

&' MRP & The Mallo Rapid Protractor is a fire control instrument designed to

aid the Squad Leader or Fire Direction Center operator in plotting targets and computing

firing data. t consists of protractor and range arm.

(' Target Grid & is a circular de#ice on !hich grid lines are printed. The

gridlines on the target grid the same as scale of the '-/"+++ firing chart" di#iding a

'"+++ meters square into '++&meters square. 2n 2Bimuth scale is printed around the

outer edge of the target grid. t is graduated in ' degree increments and num%ered

e#er$ / degrees. 2n 2rro! e0tends across the center of the target grid and used to

indicated the o%ser#er& target line. The target grid is la%eled Left or Right for lateral

correction. 2dd or Drop for range correction.

7. Grid #eet * is a plain sheet of paper or plastic (M$lar) on !hich equall$

spaced horiBontal and #erticals lines" called grid lines are printed ('- %$ '- squares).

The inter#als %et!een these grid lines !ill create '+++&meter grid squares on a scale of

'-/"+++. These scales pro#ide the %est compromise %et!een accurac$ and

con#enience.

*. Plotting Pins are used to mar6 inde0es and temporar$ position on the

firing chart. ,n a '-/"+++ scale chart" the thic6ness of the plotting pin shaft equals to

-+ meters.

/. Pencil is sharpen to a conical point and used to la%el and construct tic6

mar6s and to la%el deflection inde0.

Proced$re

Steps 2ction

'Choose a suita%le smooth surface on !hich the firing chart !ill %e constructedand place the grid sheet on this.

- Tape the opposite corner of the grid sheet do!n and ma6e sure that the tapedoes not co#er an$ grid lines.

7The grid sheet is num%ered to correspond to the map are of the Bone ofoperation in !hich the unit !ill %e operating. The first t!o digits representeasting and the second t!o digits represent the northing.

* Select the grid square at the center of the firing chart.


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chart and the second t!o digits represent the northing lines (horiBontal lines) leftside of the firing chart. Plot a tic6 mar6s and identif$ the location of a pointplotted on a firing chart.

/Place a ;T2 on the firing unit location (Mortar psn) oriented to the grid north.Then insert a map pin" mar6 and la%el the mounting aBimuth (direction of fire)

on the outer edge of the ;T2

Remo#e the ;T2" insert a map pin in the #erte0 of the MRP and place on thefiring unit location" and slide the arm of the MRP against the mounting aBimuthinde0 pin.

?Place a pin opposite the deflection graduations of the MRP correspond to thecommon referred deflection. 2nd no! read$ to recei#e a call for fire.


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Mallo Rapid Protractors Manual2

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