Ships – Building – Observation boats
Patent
1974-12-23
1976-09-14
Reger, Duane A.
Ships
Building
Observation boats
115 17, 115 34R, B63B 126
Patent
active
039800350
ABSTRACT:
A laterally extending trim vane is mounted for rotation about a horizontal axis on a submerged portion of a stern-drive propulsion unit housing, substantially within the slipstream of the propeller.
The trim vane is mounted on structure which depends downwardly from a rearward part of a horizontally elongated intermediate portion of the housing. The aft location of the trim vane provides a relatively large moment arm for the vertical trim force. Hence, for a given moment, the aft position requires less force. Also, the propeller slipstream velocity relative to the vane is considerably higher than the speed of the boat. The aft location of the vane, providing the longer moment arm, and the utilization of slipstream water, providing a relatively high velocity of motive fluid, make it possible to make the control surface of the vane quite small.
REFERENCES:
patent: 1529036 (1925-03-01), Richey
patent: 2099492 (1937-11-01), Luders
patent: 2705468 (1955-04-01), Dix
patent: 3120829 (1964-02-01), Chew et al.
patent: 3199483 (1965-08-01), Ellzey
patent: 3358635 (1967-12-01), McRee
patent: 3433195 (1969-03-01), Poole
patent: 3618551 (1971-11-01), Deslierres
patent: 3804048 (1974-04-01), Cline
Frankfort Charles E.
Reger Duane A.
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