Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Integrally shaped or blended into hub
Patent
1992-03-23
1994-10-04
Kwon, John T.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Integrally shaped or blended into hub
416 93A, 416244B, B63H 120
Patent
active
053520939
ABSTRACT:
A propeller for use on low power motors, such as two-horsepower or less electric trolling motors, is provided with three or more blades on a hub wherein the hub diameter to the blade length (i.e. the length of the blade from the hub to the outermost tip) is in the ratio of at least 1.250 to 1. The hub diameter to blade length ration is such as to produce a propeller having increased performance and is substantially weedless. The width of each blade at its root is equal to or greater than the blade length and the ratio of the sum of the widths of the blades to the circumference of the hub is approximately 1.2 to 1. The true or actual pitch of the blades is measured at 0.7 the radius of the propeller and produces the best results as far as performance and weedlessness is concerned within the range of 2" to 7". The leading edge of one blade forms a junction with the hub in close proximity to a plane containing both the longitudinal axis of the hub and the junction of the trailing edge of the next adjacent blade. The improved weedlessness obtained by this last named structure, namely, locating the junction of the leading edge of one blade either in the same plane or in close proximity to the plane containing the longitudinal axis of the hub and the junction of the trailing edge of the next adjacent blade is effective with two or more blades.
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Hannon R. Douglas
Lackman George E.
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