[Fixed][OB 2.7.17.29493] LD-10 uses an incorrect controller for its motor

[DSplayer]

Bug: LD-10 uses an incorrect controller for its motor

 

Can I reproduce it 100%: Yes

 

How to reproduce/description:

Step 1: Fire SD-10s and LD-10s in the same parameters

 

Step 2: Observe

 

Result: The SD-10 has a lower peak speed but higher average speed than the LD-10. This is due to the controller for the LD-10 firing the march stage of its motor at 1 second instead of the 6.5 seconds that the SD-10 has. The boost stage for the LD-10 also fires at 0.0 seconds instead of the 0.5 seconds of the SD-10 which allows the missile to get to a higher speed faster but still has the shortcomings of the incorrectly timed march stage.

 

LD-10 Controller:

Spoiler

 

SD-10 Controller

Spoiler

 

DCS Version: Open Beta 2.7.17.29493

 

Mods: No mods are used that change the performance of the LD-10 and SD-10.

 

Charts: https://docs.google.com/spreadsheets/d/e/2PACX-1vTsRrA95O5pcV5TTAZAaJQQh1HRGkrKPbhZc_hy3VZQLpThb1AEPsbd3jwfeWHvuuj1n6Y5kx7fVGeP/pubhtml?gid=0&single=true

 

500m

Spoiler

 

6km

Spoiler

 

12km

Spoiler

EDIT: I had done a some similar testing back in August where I swapped the controllers for the SD-10 and LD-10 out for each other to see what performance changes there would've been. Feel free to read:

 

Edited September 10, 2022 by uboats

[Napillo]

your graphs are hard to read and confusing, what is ASL and M and why do you have three different graphs on the same graph?

[DSplayer]

3 minutes ago, Napillo said:

your graphs are hard to read and confusing, what is ASL and M and why do you have three different graphs on the same graph?

M = Mach and that uses the scale on the left. ASL = Altitude above (mean) Sea Level and that refers to the scale on the right. I put 3 different graphs to show the differences between the 2 missiles which should have generally the same kinetic performance at generally the same conditions.

[Napillo]

also, is your graph showing the ld-10 launching from 12000, dropping to 11777, and then going back up again? it sounds like the controller is severely messed up.

[DSplayer]

Just now, Napillo said:

also, is your graph showing the ld-10 launching from 12000, dropping to 11777, and then going back up again? it sounds like the controller is severely messed up.

The change in altitude for the LD-10 seems to be something regarding the guidance (which I had set to PAS in these tests) while the SD-10 was maddogged. These aren't directly effected by the controller since the controller only effects the motor.

[Napillo]

3 minutes ago, DSplayer said:

the guidance

ok, well, there's something seriously wrong with the guidance, because I'd assume anyone worth their salt writing guidance code for an anti-rad missile would try to make it point towards the ground a bit, like loft as much as you can, but about 30 seconds in, or half the useful battery life of the missile, start pointing down a bit so you can pickup radar, if you haven't already.

[AeriaGloria]

In passive it cannot loft as it cannot know range. And I doubt these missiles have altimeters, probably only use INS for altitude. 

[Napillo]

3 hours ago, AeriaGloria said:

I doubt these missiles have altimeters

You don't need an altimeter to know which way is down if you know which way you're pointing.