Stepped bottom for boat

Ships – Displacement-type hull

Patent

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Details

114291, B63B 106

Patent

active

048439886

ABSTRACT:
A design for the bottom of a boat is provided which has particular applicability for the case of single-screw planing boats. The invention comprises stepped regions in each after outboard corner of the hull bottom which are sized and configured so as to give a substantial reduction in wetted bottom area, while at the same time avoiding encroaching on those two regions of the hull bottom which it is desirable to have remain in contact with the water surface in the planing condition. The first of these bottom regions which it is important to have remain wetted is a narrow arrowhead-shaped band which begins at the forward boundary of the region of the bottom which is wetted by solid water at high speed and extends for a short distance aft. This is the region of high pressure on the bottom of the boat which supports its weight in the planing condition. The second region of hull bottom which it is important to have remain wetted is that region down the middle of the boat which is above the propeller, propeller shaft, strut, and rudder. This is so that these items are shielded from the passage of ventilating air down from the surface, and are thus enabled to operate at maximum efficiency, and also so that they are prevented from causing undesirable spray and turbulence in the wake behind the boat. The configuration has the further advantage that a substantial reduction in wetted bottom area is achieved without reducing the wetted length in the planing condition, which would tend to cause porpoising.

REFERENCES:
patent: 3149351 (1964-09-01), Plum
patent: 3763810 (1973-10-01), Payne
patent: 3802370 (1974-04-01), Collier
patent: 3807337 (1974-04-01), English et al.
patent: 3996869 (1976-12-01), Hadley
patent: 4644890 (1987-02-01), Lott

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