Marine propeller

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

416234, 416237, 416243, B63H 118

Patent

active

047893060

ABSTRACT:
A multi-bladed marine propeller designed for efficient operation in intermediate, partially cavitating flow regions between fully cavitating flow and noncavitating flow. Each of the blades has a radially inner subcavitating section and an outer section which is configured to have a higher angle of attack and tapered trailing and leading edges so that it supercavitates at high speeds either with or without ventilation and subcavitates at low speeds. Various other features of each blade include different length chords on the pressure and suction sides of the outer section and an inclined trailing surface area extending between the chord ends for improved off design, design point, and astern operation. A minimized transition area is included between the inner and outer sections, and narrow chord lengths are provided in the tip area to minimize and balance overall tip section drag. The supercavitating outer section also has positive rake to improve ventilation performance and positive skew to minimize undesirable transition flow. The result is a propeller with improved efficiency at low speeds without degrading the supercavitating section performance at high speed.

REFERENCES:
patent: D138866 (1944-09-01), Orsett
patent: 283592 (1883-08-01), Fulmer
patent: 329822 (1885-11-01), De Bruignac
patent: 411802 (1889-10-01), Freed
patent: 746007 (1903-12-01), Bruncker
patent: 794010 (1905-07-01), Hayden
patent: 978677 (1910-12-01), Taylor
patent: 1041912 (1912-10-01), Tyson
patent: 1688639 (1928-10-01), Larson
patent: 1872749 (1932-08-01), Karageorge
patent: 1895252 (1933-01-01), Kontos
patent: 2327453 (1943-08-01), Presser
patent: 2421798 (1947-06-01), Marshall
patent: 2582107 (1952-01-01), Dakin
patent: 3065723 (1962-11-01), Tulin
patent: 3077173 (1963-02-01), Lang
patent: 3306246 (1967-02-01), Reder
patent: 3572962 (1971-03-01), Embleton et al.
patent: 4073601 (1978-02-01), Kress
patent: 4293280 (1981-10-01), Yim
Minutes of Meeting of Panel H-8, Society of Naval Architects and Marine Engineers, Bethesda, Md., Jan. 14, 1985.
Photograph, Propeller Design, Hatteras Yachts, 1986.
"Performance Data of Propellers for High-Speed Craft" by R. N. Newton and H. P. Rader, The Royal Institution of Naval Architects, quarterly transactions, Apr. 1961, vol. 103, No. 2.
"Supercavitating and Superventilated Propellers", by Roderick A. Barr, presented at the Annual Meeting, New York, N.Y., Nov. 12-13, 1970, The Society of Naval Architects and Marine Engineers, pp. 417-443.
"A Rational Approach to Propeller Geometry", No. 11, by J. Lester Klein, The Society of Naval Architects and Marine Engineers, paper presented at Propellers 75, Philadelphia, Pa., Jul. 22-23, 1975. 1975.
"RMI and Ingalls Select Lips Propellers for U.S. Navy Vessels", from Lips Service (a newsletter by Lips Propellers), fall, 1985.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Marine propeller does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Marine propeller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Marine propeller will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1491644

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.