Propeller combination for a boat propeller drive having...

Details Propeller combination for a boat propeller drive having... Propeller combination for a boat propeller drive having...

2005-08-30

2008-08-05

Kershteyn, Igor (Department: 3745)

Rotary kinetic fluid motors or pumps

Including shaft transmission train, brake, clutch, or...

Hand or foot operated crank, pedal or traction wheel

C415S198100, C415S223000

Reexamination Certificate

active

07407366

ABSTRACT:
Propeller combination for an aft-mounted boat propeller drive unit with counter-rotating pushing propellers (8,9). The forward propeller (9) is made with blades (12) which have blade tips with an outer edge (b) which approaches a straight line. The width of the blade tip is between 40% and 45% of the maximum width of the blade.

REFERENCES:
patent: 3312286 (1967-04-01), Irgens
patent: 3514215 (1970-05-01), Williams
patent: 4632636 (1986-12-01), Smith
patent: 4741670 (1988-05-01), Brandt
patent: 4789306 (1988-12-01), Vorus et al.
patent: RE34011 (1992-07-01), Brandt
patent: 5190441 (1993-03-01), Murphy et al.

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