How can I stop robotic joints flexing?

[fulgur]

I have a pair of rotors attached to this ship via a servo. They bend, even with KJR-Next. I can't strut or autostrut across the servo because then it wouldn't move. How can I make these stronger? (They don't impact anything on vertical ascent but when I start moving forwards, they cause the ship to spin out).

i.e.

I have a cargo bay full of reaction wheels, yet I can't do anything about this. The thrust offset (KER, a pair of Ants beneath the servos) is not much.

 

[RealKerbal3x]

@fulgur Maybe try rigid attachment? It's usually worked for me in the past.

Also, if you can, use bigger servos - they should have better joint strength.

[fulgur]

Rigid attachment is on. Autostrut to grandparent is also on, when possible (on fan shroud to servo). The problem is crossing the servo, where it bends. Which causes the thing to flip out of control. No amount of RCS, reaction wheels or anything else change it.

[AHHans]

You can lock the robotic parts, which makes them stronger and allows autostruts to traverse the robotic part. (Without the lock the two sides of a robotic parts are considered two different vessels as far as autostruts are concerned.)

If you want to move them while under load, then there isn't much that you can do to make a single link stronger. What you could do is try to distribute the load over multiple parts, or use larger and thus stronger parts.