4 ms·Some of them are. I had one as a kid. The base allowed the boat to float in water.by bmitc 5y agoSome of them are. I had one as a kid. The base allowed the boat to float in water.lb1lf 5y ago-Then you misplaced the keel and suddenly had an enforced lesson in vessel stability in the comfort of your bathtub... Good times.bombcar 5y agoThe Germans had access to a motor - always described in the manual but not available to the US.