Ships – Hull or hull adjunct employing fluid dynamic forces to... – Having fluid channeling or entrapping configuration
Patent
1989-01-23
1991-02-19
Peters, Jr., Joseph F.
Ships
Hull or hull adjunct employing fluid dynamic forces to...
Having fluid channeling or entrapping configuration
440 44, 440 69, B63B 132
Patent
active
049933493
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
It is well known that boats can be propelled
heteronomously (such as by a sail)
autonomously (where the source of energy is generated within the boat) such as by water jet propulsion or by a marine screw propeller.
Water jet propulsion is advantageous at speeds greater than 70 knots and creates problems in the structure and system as a high rate of flow is needed for satisfactory performance.
Marine screw propulsion (from 2 to 6 blades) creates problems as, if a certain number of revolutions is exceeded, cavitation occurs with reduced thrust.
To drive the propeller alternating marine internal combustion engines cooled by sea water are generally used, but their efficiency is considerably less than that of land-based engines.
The above invention eliminates or appreciably lessens these drawbacks by means of a system which creates a high thrust and at the same time allows the boat to ride on a cushion of air as will be explained below.
SUMMARY OF THE INVENTION
Subject of the invention is a system of propulsion for boats obtained by thrust from jets of air inside a pair of equal rectilinear parallel channels, open on the downward side, symmetrical in relation to the longitudinal axis, mounted under the hull, substantially flat, placed one on each side of a third and broader rectilinear axial channel. While in movement, the hull is therefore practically resting on the air entering the pair of channels and on that generated in the middle channel due to boat movement itself. All this causes the boat to be raised above the surface of the water thus reducing sliding friction.
The air is sucked in near the bow end by an internally mounted engine-driven propeller and is carried in two tubular ducts inside the hull, flowing out through apertures at the summit of the pair of channels near the stern. The propeller is driven by an internal combustion engine of the type used on land.
The mouths for air outflow are fitted with on-off valves and with directional conveyors to stop the jets in one channel or the other and change their direction thus driving the boat forward or slowing it down as desired.
On each of its sides, respectively towards bow and stern, there are at least two nozzles fitted with on-off valves connected to the tubular parallel ducts carrying compressed air so that by opening one or other of the nozzles, the boat can be turned round in either direction as desired and can make any other limited movements that may be required within a small space.
The on-off valves and directional conveyors are served by hydraulic cylinders operated by a set of controls, placed on a dashboard and the like, from a unit driven by the propeller engine.
The cross section of the central channel is substantially in the shape of a wide arc joined at the ends by narrower arcs.
The section of the channels placed side by side is throughout substantially semi-circular.
The hull has substantially vertical sides and a base which is practically formed of the three said channels and of the lower extremities of the sides which project laterally, in convex form, in relation to the external vertical sides of the lateral channels and at a level above their base. These projecting sides therefore help to keep the boat steady when lying still or moving slowly while, when at a certain speed, they are practically off the water thereby reducing friction.
The nozzles are placed in the small longitudinal groove formed between the external vertical sides of the pair of channels and the lateral convex sections of the bottom of the hull.
The directional conveyors of the tubular ducts carrying compressed air are formed of a sort of vertical arched groove, with the concave side towards air jet inflow, articulated crosswise to its axis and to the channel in which each conveyor is mounted.
Said articulation makes possible its partial or complete projection in the space occupied by the channel, compelling the jet of compressed air flowing to the stern to turn downwards and towards the bow, to slow down the boat or put it into
REFERENCES:
patent: 1408178 (1922-02-01), Downing
patent: 1656411 (1928-01-01), Baldwin
patent: 1795596 (1931-03-01), Fleming et al.
patent: 1837508 (1931-12-01), Volf, Jr.
patent: 1960826 (1934-05-01), Ouellett
patent: 2993462 (1961-07-01), Gough
Peters Jr. Joseph F.
Sotelo Jesus D.
Striker Michael J.
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