The space derby is a racing event for Cub Scouts that is similar to the Pinewood Derby. Cub Scouts race miniature balsa wood rockets that are propelled by a rubber band and propeller.
The completed rockets are wound up with as many as 100 or more turns on the propeller and suspended on a string with the propeller held in place. Two, three or four string "lanes" are typically used. The rockets are held in place and "launched" when the mechanism releases the propeller and the rockets race to the finish line.
Be sure to read the Official Space Derby Rules before race day.
2012 Space Derby Results
2011 Space Derby Results