[Valentin] is the MacGyver of model rocketry, building a small rocket out of ... Cat litter, matchsticks, and a ballpoint pen are the raw materials that he rounded up before setting to work ...

When you’re building and launching a variety of advanced model rockets like [Joe Barnard], you don’t want to spend time building (and debugging) specialized flight computers for every rocket ...

Long before model rockets became Randy Boadway’s business ... and through the Wright Stuff Rocketeers club. “We love building things, and we especially love flying things,” he said.