Free-flooding chamber structuremountable on the underside of a w

Details Free-flooding chamber structuremountable on the underside of a w Free-flooding chamber structuremountable on the underside of a w

1976-03-10

1977-09-20

Blix, Trygve M.

Ships

Ballasting

Water tanks

9 6R, 114 56, 114274, B63B 116

Patent

active

040489396

ABSTRACT:
One or more hollow elongated structures are mounted on the underside of a boat to provide wave-forming lift surfaces. Each structure defines a chamber which substantially parallels the length of the boat. Each structure has a pointed, closed forward end, an open rearward end, and an outer surface which tapers, at least in part, to provide a smooth transition between the ends and to define a planing surface that increases in area as it approaches the rearward end. When the boat is at rest, water enters the chamber and helps to stabilize the boat. When the boat gets underway, the chamber empties and the planing action of the outer surface lifts the boat and reduces its wetted surface area. Emptying water from the chamber is facilitated by ducting air or exhaust gases into the chamber. Ducting exhaust gases into the chamber has the advantages of muffling exhaust noise and reducing engine back pressure when the boat is underway, thereby enhancing engine performance. Each of the free-flooding structures preferably has the configuration of a section sliced from a hollow cylindrical tube along a plane that obliquely intersects the axis of the tube. Hydrofoils are preferably carried on the structures to assist in stabilizing and lifting the boat.

REFERENCES:
patent: 2704529 (1955-03-01), Hulett
patent: 2757629 (1956-08-01), Wiltse
patent: 3085535 (1963-04-01), Hunt
patent: 3208422 (1965-09-01), Schopmeyer
patent: 3361104 (1968-01-01), Glass
patent: 3503358 (1970-03-01), Moesly
patent: 3745964 (1973-07-01), Henrich
patent: 3991698 (1976-11-01), Simpson

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