CUPPED PROPELLER TEST AND ANALYSIS
Cupping a propeller means to deform its blades near the trailing edge, thus increasing the profile camber. Gawn-Burrill propellers with z = 3, P/D varied from 0.8 to 1.6, AE/AO = 0.5, medium cupped, were tested in open water condition. Cavitation tests were performed for P/D = 1.0 The cupped propeller performance could be predicted from the Newton-Rader series by the virtual pitch concept with good accuracy both in cavitating and non-cavitating conditions. Suitable cupping could increase the effective pitch ratio and improve the cavitation performance, however with 5% less efficiency compared to the Newton-Rader series in non-cavitating condition. A numerical method for calculating the virtual pitch of cupped propeller is presented.
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Supplemental Notes:
- Ship Technology Research, v 42 n 4, Oct 1995, p 186 [7 p, 7 ref, 4 tab, 21 fig]
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Authors:
- Hwang
- J-L
- Tsai
- J-F
- Li
- C-Y
- Publication Date: 1995
Language
- English
Subject/Index Terms
- TRT Terms: Cavitation (Mechanics); Propellers; Thrust
- Old TRIS Terms: Cupped propellers; Propeller efficiency
- Subject Areas: Marine Transportation; Vehicles and Equipment;
Filing Info
- Accession Number: 00718489
- Record Type: Publication
- Source Agency: British Maritime Technology
- Files: TRIS
- Created Date: Mar 27 1996 12:00AM