flight simulator

Hi,

I wanted to create a interactive flight simulator and was wondering are there any open source libraries available that does all the physics/mathematics work.

Note that my main emphasis is on getting the core/kernel lib that will take in initial position (lat-lon-alt-yaw-pitch-roll) and probably speed/thrust or whatever it takes to fly the aircraft and provide the same.

I will be sending the position to 3d image generator through network which will place the aircraft at the outputted location.

Any comments are welcomed.