Try something new your troop will thoroughly enjoy!
The space derby is very similar to a Pinewood or Powder Puff Derby. A quick google search will show you examples. There are even easy plans for building your own track. The rocket kits can be purchased from a BSA shop.
*Race miniature balsa wood gliders that are propelled by a rubber band and propeller. During the 60's, this was also known as the "rocket derby". https://en.m.wikipedia.org/wiki/Space_derby