aircraft phyiscs

Hi!

I want to create an aircraft which is controlled by the physic engine.
After some researche in the net, I found out that calculating the forces,... isn't simple.
So does anybody have a brief explanation on how to calculate the torques/forces? Or an example code?

Thanks!

Why not just using the code of character positionning on ground with_trace ?
Just add code to make it falling as the engine decrease in power.

Because I want a nicer "on ground" behavior. The aircraft should also do landing and starting and simulating the tires without the physic engine is to inconvenient in my opinion.

...Just a tip, based on experience, don't use physics engines for flight sims. It's not easy to hardcode the physics, but it's much better...