The mannered null propellent which obstructs the buoyant dispersion device and

摘要

Execution form of the method of obstructing the buoyant dispersion device and the boat is explained generally here. With some execution forms the abundant gas occurs from the propellent, spreads at the level which is lower than the draft line of the boat. The result air bubble vanishes the buoyancy of the boat, gives the non fatal obstruction effect. Selective figure Figure 1