Here is a project I started as a test of Ogre Engine and it slowly grew into a (Dragon) Flight Simulator.
It does not look very good for now, but maybe it will grow into something better.
Used: Ogre3D + Bullet Physics + OgreAL + iOS UIKit
Sorry for the video quality, the iOS simulator gives only about 6 FPS.
[youtube]Il0FLIfRxHM[/youtube]