rocket cups in the recent Family Fun Magazine I know they would be a hit with both the girls.
After mastering the basic blast off we played around with our elastic toys and found that one of the rockets consistently went higher than the other. We fiddled a bit and decided that the tighter the rubber band the higher the rockets went. Not satisfied with that as the final answer A continued experimenting and discovered that the rockets went higher when they were pushed all the way down over the other cup and that if she didn't push the rockets down very far they didn't go very high. To the delight of my kids our rocket with the tightest rubber band almost hit the ceiling when pressed down fully and launched from the dining room table.
What is your favorite way to play with rubber bands?