As the Michigan chapter of Model Warship Combat Inc., we build and battle radio controlled 1/144th scale reproductions of World War I and World War II ships. Our ships use CO2-powered cannons to fire BBs at each other, piercing the balsa-skinned hulls. If we take in too much damage (and the ship's pump can't keep up) we sink! The damage is repaired within minutes, allowing us to battle several times in a day.