AddForce and Momentum‏

Hi guys.

I have a problem with the Physics Engine.
Few days ago I started working with Physics, so maybe this is a stupid question.

I have a drone, with different gameobjects as children, rotor 1, rotor 2, etc., every gameobject has its own Rigidbody with gravity enabled.

I want to drive the drone using AddForce, but it seems that it doesn’t generate the momentum. For example, if I use add force only on one rotor (so it shouldn’t be balanced) the drone remains parallel to the ground and this is irrealistic.

Can anyone help me please?

Thank in advance.

I figured out what is the problem!

The drone model that I’m using have a very bad mesh, every mesh in the drone has the center in the center of the drone, so AddForce applies a force at the center of the drone and stays always in equilibrium!

Now I added other fake gameobjects in the position of the rotors and applying the force to these gameobjects it works!