Rocket car [Update: New video!!]
The rocket car was build from three RTF model rockets, a cardboard roll, 3 mm stainless steel wire, four 56 mm dia. TAMIYA racing wheels, plastic tubes, a lot of epoxy, aluminum foil and Epoxy Resin Putty.
The rocket car weights around 400 g and will be propelled by two C6 blackpowder model rocket engines. I plan to measure the burnout velocity. The wheel encoder (from an damaged printer) is mounted on one of the front wheels and contains two Hall sensors. The wheel encoder has a resolution of 30°.
The ignition of the rocket motors is remote controlled. After the burnout time is reached, a Picaxe 08M counts the wheel encoder impulses in a defined time intervall and display the value via two CMOS 4026 on a 2-digit-7 segment display. It is then easy to calculate the burnout velocity. I will compare the measured burnout velocity with the calculated burnout velocity by the rocket car equation I have derived.
2010.6.16: New video is up! Have fun and more soon!