Ships – Building – Canal and ferry boats
Patent
1976-11-03
1978-05-09
Kelmachter, Barry L.
Ships
Building
Canal and ferry boats
114162, B63H 516
Patent
active
040880915
ABSTRACT:
There is disclosed a fin structure for mounting in an opening in the hull of a power boat having an elongated rectangular panel connected between the base edges of a pair of elongated fins, each fin having a base edge, a leading edge and a trailing edge, being joined to the elongated rectangular panel to locate the pair of fins in substantially parallel alignment and to form a channel adapted to receive a propeller and propeller shaft therein with the propeller in proximity of the trailing edges, the trailing edge of each fin projecting from one end of the base edge beyond the outer most extremeties of the propeller received in the channel, the leading edge extending from the end of the trailing edge and sloping forward along the hull to the other end of the base edge in a manner to be more distant from the rectangular panel at any point than the propeller shaft received in the channel such that the propeller and propeller shaft are entirely contained within the channel formed between the pair of fins to protect the propeller and propeller shaft from damage when the fin structure is mounted in the opening in the hull such that the fins extend from the hull, the leading edges forming skids and offering a minimum of resistance to movement through water as well as adding stability to the hull and increasing the efficiency of the propeller. A rudder may be attached to each trailing edge of the fins and a "V-drive" unit may be added to reverse the longitudinal direction of the transmission power-train between the propeller shaft and an engine inside the hull.
REFERENCES:
patent: 961750 (1910-06-01), Branth
patent: 985187 (1911-02-01), Lindgren
patent: 1007583 (1911-10-01), Loetzer
patent: 1108340 (1914-08-01), Criqui
patent: 3823684 (1974-07-01), Baggs
Kelmachter Barry L.
Madsen Raymond L.
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