Power boat

Ships – Building – Observation boats

Patent

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Details

B63B 118

Patent

active

039526780

ABSTRACT:
A central, longitudinally extending, main body boat portion has a step planing surface located forward of the boat's center of gravity. Parallel side sponsons are connected by a wing structure to the main body with the sponsons parallel to the main body portion. Each sponson has forward and rearward stepped planing surfaces disposed, respectively, forwardly and rearwardly of the boat's center of gravity. The propeller and powerplant therefor are disposed in the main body portion and positioned relative to the stepped portions to cause the propeller to operate two-thirds in water at higher speeds. Fins at the under and rear sides of the boat cooperate with a rudder disposed at the forward main underside portion in steering the boat. One of such fins is disposed close to the wash leaving the propeller to counterbalance the torque of the propeller. Each wing structure, connecting the main body and the sponson, is tapered to a sharp, leading edge and to a thin trailing edge with the leading edge disposed approximately twice as far from the water as the trailing edge at higher boat speeds. During higher speeds, the sponsons prevent relatively passing air from escaping sidewise and air is compressed under the wing structure producing a lift which carries most of the weight of the boat. This lift decreases if the boat rises from the water, due to the water surface conditions, and thus balance conditions prevail during boat travel.

REFERENCES:
patent: 1396831 (1921-11-01), Gardner
patent: 1842858 (1932-01-01), Couzinet
patent: 3112725 (1963-12-01), Malrose
patent: 3118411 (1964-01-01), Koriagin
patent: 3394673 (1968-07-01), Hamori
patent: 3785330 (1974-01-01), Fox
patent: D117415 (1939-10-01), Gassaway
patent: D215370 (1969-09-01), Calkins

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