Just got my racesim working for the first time.  Here is a really quick vid of the basic movement.  Needs alot of tweaking and more assembly but its working!

Here is a quick overview:

- Built almost entirely with MDF Sheets (no metalwork or welding required)

- Seat mover design

- Uses Ropes and Pulleys to transfer motor output to seat movement

- Use the “Big Wormgear” motors available from motiondynamics

- Uses single 360W cheap power supply from China off eBay (sold as LED lighting PSUs)

- Uses H-Bridges from China off eBay (Sold as 43A units, probably more like 20A continuous?)

- Uses Arduino X-PID controller

- Max 125mm linear movement at seat connection point (equivalent to 250mm linear actuator at shoulder height)

- Max 300mm/sec linear speed at seat connection point (equivalent to 600mm/sec linear actuator at shoulder height)

- By adjusting drive and feedback pulley sizes can change speed and max movement

- Drive and Feedback pulleys also made of MDF using hole saw

- Have currently backed off motor power to 80% and restricted movement to 80% travel (via XPID software)

- Motors don’t seem to be stressed at all, H-Bridges run cool enough to hold finger on drivers (Although haven’t run for more than about 5mins at a time so far)

- Electronics neatly housed in the base assembly

- Uses a 1/2in Universal Socket adaptor as the universal joint

- It is solid but heavy!

Still to do:

- Add traction loss – Have modified X-PID software to drive three motors with one Arduino – hasn’t been tested though

- Finish the front end console

- Paint and decals

- Look at reducing the weight

- Learn how to drive properly