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Locking RCS roll thurst; stock RCS code not optimized?


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I'm looking at making a custom specialized RCS port that will be put at the top of the vessel and should utilize max roll thrust. I thought I could use stock RCS code since rcs thrust shouldn't depend on how far RCS is from CoM length-wise. In other words top and central rcs ports should deliver the same (full) roll thrust:

OVgy66M.png?1

However you can see that when trying to roll central rcs fire with full power, however top ones are just barely working. Is there something I'm missing here?

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roll around your z axis? If all ports fired your thrust would cancel out. Or did I misunderstand you?

roll around the roll axis. I installed 8 rcs ports, 4 fire depending on whether you want + or - roll. They all should fire with same (max) thrust, however 2 on the top have minimal thrust.

ZUStAGG.png

All 8 rcs are placed symmetricaly along roll axis (4 beams, each with 2 rcs). By far and near CoM I mean distance along roll axis (other distances don't affect thrust power).

Edited by riocrokite
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Can you try add two more ports and put them down at the other end next to the engine?

I suspect what is happening is KSP is seeing you are missing those ports so it thinks that if it fired the front ones at full power it would start pitching the vessel up/down rather then rolling it.

Never mind that you have a port on the other side to cancel said pitch up/down, I don't think the RCS sub-system is that smart.

D.

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Can you try add two more ports and put them down at the other end next to the engine?

I suspect what is happening is KSP is seeing you are missing those ports so it thinks that if it fired the front ones at full power it would start pitching the vessel up/down rather then rolling it.

Never mind that you have a port on the other side to cancel said pitch up/down, I don't think the RCS sub-system is that smart.

D.

This behaviour doesn't depend on number of rcs ports etc. In other words it's the same with 1 or 100 rcs ports placed in different places.

Then I think that one should be able to roll vessel no matter where you put rcs ports along roll axis symmetry (in pairs ofc).

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This is indeed how stock RCS works, the thrust it produces is proportional to the orientation cross product.
uh ? It tought it was changed a while back and it only did that in precision mode. I m gettijng old :(

Thanks for your response. Just to clarify, roll thrust shouldn't be dependent on the distance from CoM along roll axis, should it? In other words no matter where along roll axis you put thrusters (other coordinates being const) they should always produce same amount of thrust to roll the vessel.

Edited by riocrokite
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