Derby Talk

We were considering tieing a knot on 1 end of each band creating about 1/4" loop of excess "engine" and slipping the dowel in behind the knots. We were concerned the excess loop in the back would create drag. If we were to cut them off, then the square knot idea would be better so it ...

Got a question about the space derby kit I just got. The rubber bands are much longer than kits I had in the past. A reasonable length for a 7" rocket with a prop assembly 1 1/4" max should be between 5 3/4" to 6 1/4". The rubber bands in this kit come in at 7 1/4" and hang ...