Semi- dipping propeller propulsion engine of draining and semi- draining boat

摘要

The power which is used was equal, it makes a higher propulsion efficiency possible, it makes that drive system of the propeller is maintained completely with respect to water level possible, the bottom lower part blade was soaked partly regardless of to motion state and the trim of the boat, being the propulsion engine of the draining or semi- draining boat where the upper blade was raised and was arranged, includes the propeller of 1 or more of semi- dipping type, the aforementioned semi- dipping propeller to be arranged in the transom, diameter (D) ratio, or, the waterline with (3) breadth of ship (L) diameter of the semi- dipping propeller for (NpxD) totalIt is larger than 0.50. Selective figure Figure 4