Related to the previous toot on drones and Cox model airplanes, as a child, I also built Estes model rocket kits. Once the rocket was built, ignitable engines were inserted in the bottom and fired for takeoff by a car battery. The rocket would go up then pop a parachute to return to ground for retrieval. The last flight, I put in an engine that greatly exceeded the recommended size and never saw my model again. I think my parents hoped that it all would lead to some career with NASA.