helicopter problem.

do you build without mods?
because stable helicopter needs some sort of autostabilization
I do build with mods(buildingtools. etc), but since i want my builds to be mostly vanilla, I don’t use modded blocks& such. the helicopter is stable in flight, but:
Can you be more precise on what the problem is?
after about a minute of flight the rotors start intersecting, and break. this happens, because the wheels they are mounted to start getting tilted during flight.