When I was a young fella my Dad would get the motor running in his 22" balsa speed boat in our plastic two tier paddling pool, not having any length to the pool the best he could do is make a whirlpool and get mum cranky, but he loved that motor. It was purchased early in his marriage not sure what came first me or the motor. When my brother and I were older and became interested in control line flying it broke his heart to watch us fly his motor on the concrete netball courts, the best we could do were prop rides we didn't have enough power to safely do a loop without whipping the lines to get a faster approach.