Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Coating – specific composition or characteristic
Patent
1981-10-06
1988-08-30
Hornsby, Harvey C.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Coating, specific composition or characteristic
415212R, 415214, 416 93A, F01D 528
Patent
active
047672781
ABSTRACT:
Improved screw propellers especially useful in the propulsion of small boats are constructed at low cost from cast iron characterized by rounded graphite in a ferritic, pearlitic and/or acicular matrix. The propeller is exceptionally strong and may be driven by a prime mover at a speed up to 9,000 revolutions per minute without the blades losing their pitch or being easily damaged when submerged objects are struck at high speed. The disclosure is also concerned with outboard motors provided with the ductile iron propeller of the invention, and with small power boats having a propulsion unit which includes the ductile iron propeller of the invention. The propeller has certain preferred dimensions and characteristics, and should be constructed from ductile iron having the composition disclosed herein. The disclosed ductile iron propeller improves the operation of propulsion units of the type normally provided with inexpensive light weight propellers for the reasons noted herein. The disclosure also relates to a method of operating a power boat having a propulsion unit including the propeller of the invention.
REFERENCES:
patent: 2044294 (1936-06-01), Handler
patent: 2996035 (1961-08-01), Torrey
patent: 3000790 (1961-09-01), Wiltmoser
patent: 3269351 (1966-08-01), Shimanckas
patent: 3729345 (1973-04-01), Oda
patent: 3846045 (1974-11-01), Mincuzzi
patent: 4080198 (1978-03-01), Heyer
patent: 4090813 (1978-05-01), Minato et al.
patent: 4096002 (1978-06-01), Ikawa
patent: 4099994 (1978-07-01), Ikawa
patent: 4338128 (1982-07-01), Farge
Hornsby Harvey C.
Landingham, Jr. L. S. Van
Stinson Frankie L.
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