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M4 Scorcher gun elevation is relative to vehicle, askant and seems to have an angle-specific offset
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Description

first off, sorry for my bad english.

While i tried to figure out how to direct fire with the scorcher, i have encountered severeal issues:

  1. the gun elevation displayed is relative to the vehicle's pitch, which means it will display e.g. 10° on both a flat ground and upwards to a hill, although while driving upwards the total angle is higher, like e.g. 18°. this of course applies to every not totally flat surface.
  1. the turret itsself is askant, if you shoot with gun elevation 10° and have your direction aligned with the driver (0° deviation so to say) you will actually shoot with around 11,6 or 11,7 (depending on the way you measure it), this can also be seen in the optice, which display an target of the same height with -1,6° or -1,7°.

At 180° deviation (shooting to the back) it is vice versa, you will shoot at 8,3° or 8,4 degrees, can also be seen in the optics.

  1. there seems to be an angle-specific angle offset, at least that's what i think it is. i discovered this the following way:

In the biggest salt lake i set up a target, and measured the required angle in 50 meter steps from 700 to 2000 m at 0° deviation (shooting to the front).
i then calculated: (my calculated angle) - (the required angle) + (optic elevation) and got the following table:

distance offset

750 -0,2
800 -0,21
850 -0,23
900 -0,25
950 -0,25
1000 -0,28
1050 -0,29
1100 -0,31
1150 -0,33
1200 -0,34
1250 -0,35
1300 -0,39
1350 -0,41
1400 -0,43
1450 -0,45
1500 -0,46
1550 -0,5
1600 -0,51
1650 -0,54
1700 -0,58
1750 -0,6
1800 -0,65
1850 -0,68
1900 -0,71
1950 -0,8
2000 -0,92

angle went from 79,44 to 59,48
this brings me to assume there are also offsets for the lower angles, and my not knowing (and therefor not using) of them are the reason my shells tend to miss.
one thing i've noticed though is that for my correction i usally have values ranging from 0,1 to 0,4 but never had anything larger 0,5.

Details

Legacy ID
1178984933
Severity
None
Resolution
Open
Reproducibility
Always
Category
Config

Event Timeline

quantenfrik edited Additional Information. (Show Details)
quantenfrik set Category to Config.
quantenfrik set Reproducibility to Always.
quantenfrik set Severity to None.
quantenfrik set Resolution to Open.
quantenfrik set Legacy ID to 1178984933.May 7 2016, 5:39 PM

found out this offset was caused by calculation errors, but i have encountered another one, however, it appears only at low angle making it very difficult to get exact data, because i would have to shoot some dozens shell on each 100m mark to get accurate data.