A Toypedo is a rocket-like rubber pool toy that will glide amazing distances underwater. This was a mainstay in our beach/pool gear but I hadn't thought about it for years. I ran across it the other day and moved it close to some of my rocket paraphernalia. I keep thinking about making a mold from it so I could make a fleet of Toypedo rockets. Here it is next to one of my BT-55 V2s.