Oar

Details Oar Oar

1985-11-26

1987-05-12

Nase, Jeffrey V.

Marine propulsion

Oar or paddle

440107, B63H 1604

Patent

active

046646370

ABSTRACT:
The oar disclosed herein is re-enforce by a stay which is anchored at both ends of the oar shaft and is supported near the oar lock location by a brace. The two points, where the stay emanates from the oar shaft, lie in the same plane as a set of points at the tip of the brace. The points, that define the aforementioned plane may be aligned to form a triangle. The triangle is assigned a vertex near the tip of the brace. When the oar blade is normal to the water surface during an oar stroke, the vertex of the aforementioned triangle points downwardly with respect to the force direction of the blade in the water. The stroke forces thereby produce a moment that tends to unfeather the oar blade. The unfeathering of the oar blade must be arrested by an oar lock as soon as the blade surface becomes normal to the water surface. To maintain the oar blade in the proper position during the stroke requires no handle torque as long as the oar lock of the oar is equipped with a stop to prevent further unfeathering of the oar.

REFERENCES:
patent: 231016 (1880-08-01), Davis
patent: 2213538 (1940-09-01), Whitehead
patent: 3025538 (1962-03-01), Holand
patent: 3324490 (1967-06-01), Jewett

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