Rolandvanroy is working on a six degree of freedom motion platform for a flight simulator:
Detailed description of a home-build balanced linear actuator for six degree of freedom (6DoF) motion platform for flight simulator. Video shows step by step construction and some basic actuator test runs under load. The platform needs 6 of these actuators, and the electrical drive will be done via hardware servo electronics and the BFF 6DoF motion driver.
Via Hacked Gadgets.