How do I stop parts from disconnecting.

Ok then @SamTheFox

put it in a drawer and leave it there until someone has another suggestion

That would take to long @SamTheFox.

my other idea is to rebuild the entire system

Why though @SamTheFox, they disconnect even when no throttle is applied.

decrease engine max thrust

@SamTheFox They already don’t. Any more ideas?

Ok @SamTheFox

we'll start with making the pistons not intersect anything

@SamTheFox what do you recommend doing then?

the reason why they disconnect is either too much acceleration applied by the engine, or it's because the piston and hinge are intersecting the leg

@SamTheFox Here

upload the craft so i can see the problem

Ok that did not work at all @SamTheFox

@SamTheFox I will try it

this requires the tinker panel:
set the part collisions and collision response to none and never, it should allow them to be indestructible from external forces