Can you post some of the code for the physics in polymaniacs or tell me how it works exactly.
I can't post any code at this point - I've spend a looong time getting to this point and until I finish my game I'll need to keep my secrets. Besides, without seeing how it all hangs together in it's entirety, specific functions wouldn't make much sense to you.
That said, it isn't a million miles away from what Pongo is doing although I am correctly applying external forces ( friction / drag / gravity / thrust / lift / buoyancy etc.. ) and have a load of functions to prevent verlet cages braking, body/body collisions, turning physics off on static objects and self-righting vehicles.
Keep in there with Troy - he knows what he's doing and you will understand it better having built it from the ground up.
Stevie