Ain't nothin' like the thrill of runnin' shine! Throw your flat-bottomed fanboat into high gear and slip and slide through the muddy waters of the backwoods bayou.
http://www.vectorunit.com/shinerunner

Bullet handles all the collision detection and rigid body simulation. Our engine calculates all water-related forces (buoyancy, drag, lift).
- Bullet-related notes
 - Bullet runs on its own thread at 60hz
 - Using SI units throughout
 - Boats are about 4m long and have a mass of 2000kg
 - Using btDbvtBroadphase
 - On iPhone 3GS (min spec device), ragdoll simulation is simplified: they fade out right away, don't collide with stuff and don't interact with water. On all other devices ragdolls are fully interactive before fading out.
 
Ralf Knoesel
Vector Unit Inc