RCS not working for attitude control

[devlanmcd]

I've built a fairly large rocket, something akin to Starship at 187 tonnes. 

I put 8 clusters of RCS blocks on it, each comprised of 6 3-way blocks for a total of 48 RCS blocks. 

I can translate, but I can't rotate with them. They are on for all DOF, so I'm baffled. Is there a maximum number that the game can manage?

[Hotel26]

Welcome to the forum!

I would suspect the mass/inertia.

I would Mod-F12 two of them into orbit/rendez-vous, one full fuel and the other with no LFO, but just MP for the RCS.  For comparison and also as a translation reference (though you said that's working).

See if the lighter vehicle rotates at all and any better than the heavy one.

For a vehicle like that, you might consider using the LFO-powered Vernor RCS, which is more powerful.  I would also almost certainly be using some number of the large size RW for that size ship.

[devlanmcd]

Thanks, Hotel!

Rotation isn't working at all through RCS. They activate just fine for translation, but only the reaction wheels are responding to QEWSAD keys. 

I tried swapping to the Vernor engines with the same results, except now the ones positioned for forward movement are activating with the throttle, despite it being disabled. 

I did notice that the pitch/roll/yaw toggles are cycling between on and off several times a second.