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#1
02-15-2008, 11:01 AM
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| Prop absorb vs power One question. The power absorbed by the propeller is: Diameter^4 x Pitch x Rpm^3 x 1.3 / 1E +14 ? Example: Propeller 23" x 14" 1500 RPM = 172 hp 1050 RPM = 59 hp 600 RPM = 11 hp The calculations are correct? Thank you, Bit  |
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#2
02-15-2008, 12:05 PM
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| No. Power absorbed is a function of torque and rpm. Torque is a function pitch, diameter, rpm, and speed of advance. Therefor your equation cannot be correct, though it may be a curve fit of some specific data. See the following lecture notes. http://ocw.mit.edu/NR/rdonlyres/D5F2...eller_test.pdf
__________________ A vessel is nothing but a bunch of opinions and compromises held together by the faith of the builders and engineers that they did it correctly. Therefor the only thing a Naval Architect has to sell is his opinion. |
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