This image is from madlaboratory.wordpress.com, mentioned below.
You think water rockets are fun? My favorite are paper rockets! They go WAY higher and faster and give me a huge thrill! Last summer my husband made a water rocket launcher for our family to use in the summertime, and we're excited about that. After having experienced air compressed paper rockets at Akela's Council in Sept, he is even more excited about making a paper rocket launcher. Thus, the reason for this post. This can be done all year round without getting wet!
An compressed air paper rocket launcher is DEFINITELY the one I'd use for a pack meeting!
At a den meeting the boys can make a stomp launcher for their rocket fun at home with things they probably have around the home:
bicycle innertube or vacuum hose
2 ft (1/2-3/4” diameter) PVC tube or metal pipe
duct and masking tape or scotch tape
file folder or cardstock (for rocket)
This would pass off several requirements or electives, but just taking a look at requirements: Wolf 10b (Family Fun), Bear 10b (Family Fun), Webelos Craftsman 4 (Build something useful out of material besides wood)
Here is a paper rocket instruction sheet, but you can see one made with real pictures (much easier to understand, I think) if you just go to the original site: http://madlaboratory.wordpress.com/tag/paper/