Comet Rookie, McCoy .35 in 1959. Five year olds don't fly very long. Built a rubber powered model 3 or 4 years later, then a Scientific Mustang with a Cox RR1. Ten year olds fly fine, but every flying session ended with the motor knocked off. Epoxy would have helped. After a couple years moved back into the big stuff with a Veco Warrior, Goldberg Shoestring, and a number of Midwest Magician, both .35 and .15 sizes, and was building a Super Ringmaster when the Falcon 56 got on the building board. Never finished the Ringmaster.