RCS Controlling Roll?

[MortalDanger]

Eh, for some reason after 23.5 my RCS thrusters don't respond to rolling of the craft, either manually or through SAS. Am I missing something? I assume its my fault and not a bug.

[daniu]

You mean roll as in pressing Q and E?

I know it's possible to attach RCS in a way to not be able to perform translation maneuvers - by blocking them with another part or not attaching the thrusters needed for that maneuver.

Can't think of a configuration how you'd manage that for roll though, any sideway thruster should be able to do that.

[karolus10]

RCS control axis aren't tweakable at this point unlike control surfaces, they will always work both for rotation and translation in every axis.

[daniu]

RCS control axis aren't tweakable at this point unlike control surfaces, they will always work both for rotation and translation in every axis.

That is not correct; I built a craft with no up/down (I/K) translation possible by only adding thrusters to the top and bottom of (RV-105s, don't know able Place-Anywheres).

[Kasuha]

Does your ship roll using reaction wheels? If not, you might have that key mapped somewhere else.

If the key is working and RCS does not help with roll, picture might help to identify possible wrong RCS thruster placement.

Another option is that some of your mods which were compatible with 0.23 are not compatible with 0.23.5

[Dave Kerbin]

I've noticed this too and was wondering if it was a bug or intended.

Specifically it has to do with weight. I built a test craft consisting of a pod, RCS tank and 4 RCS thrusters. Pressing W showed visible RCS thrust (the jet of white particles) and consumed a notable amount of monopropellent. Pressing Q also showed visible thrust and consumed propellent as well (as measured on the resource pane at the upper right). However if I added weight to the craft (19 orange tanks) the W key still produced visible thrust and consumed notable RCS, but the Q key now produced an almost invisible amount of thrust and the monopropellent consumption was almost too small to measure. On a longer craft (where I first encounterd it) pressing Q or E produced no visible thrust and no measurable monopropellent usage - my guess it was producing some thrust but it was less then 0.01 monopropellent being spent per second.

Again I'm not sure if this is intended behavoir because of the balancing of the craft or not. If you stick a lot of thrusters on the heavy end of the ship you get visible thrust from them but not from the thrusters at the top. That would lead me to believe that the game is trying compensate for the center of mass by firing the thrusters near the bottom more then the ones at the top. Yet even with enough thrusters on both ends pressing Q or E doesn't properly roll the ship - you get pitch and yaw movement as well. This leads me to believe there may be a bug in how the game is calculating the correct thruster balance to use for rolling - the thrusters on the heavy end are firing too much and the ones on the light end too little.