This is a 1:40 scale model of a WWII era German G7e/T3 torpedo. It is designed to be fitted with a micro motor and electronic timer. It's intended for use with the Robbe U47 or similar model submarines. A launch mechanism is also available in my shop.
The buoyancy is excellent, even when completely filled with water it still hangs just below the surface of the water. To completely waterprooof this model you should paint it and add a O-ring and roll some tape around the connecting bus.
Note that this is the body only, there's no propellor included in this version yet.