Wolfram Demonstrations Project

I found a simple, but excellent little demo of a jet engine's thrust reverser on this site:

http://demonstrations.wolfram.com/index.html

Description of Wolfram Demonstrations Project from their site:

Conceived by Mathematica creator and scientist Stephen Wolfram as a way to bring computational exploration to the widest possible audience, the Wolfram Demonstrations Project is an open-code resource that uses dynamic computation to illuminate concepts in science, technology, mathematics, art, finance, and a remarkable range of other fields.

Its daily growing collection of interactive illustrations is created by Mathematica users from around the world who participate by contributing innovative Demonstrations.