# hull interactions efficiency

Discussion in 'Props' started by ikh_one86, Aug 23, 2010.

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### ikh_one86New Member

i would like to ask, does any one know what is the value for hull efficiency for high seed vessel? i would like to predicted in order to design propulsion system for high speed vessel.

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### jehardimanSenior Member

For a high speed vessel, it should be just under 1 if you arranged the hull and propeller right.

eta(h) = (1-t)/(1-w) in Taylor notation where t is the thrust deduction factor and w is the wake fraction. Unlike a moderate speed vessel which can have eta(h) over 1.0, a high speed (semi-planing) vessel will have t larger than w so will always be less than 1.0.

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### ikh_one86New Member

thanks jehardimen.. anothe question is, where can i have Wageningen which cover for 5 blade of propeller.

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### Olavnaval architect

Wageningen B-Series Open Water Curves

ihk_one86,

you might want to check this out: Wageningen B-Series Propeller Charts

This PDF contains curves plotting KT, KQ, and η0 as a function of J as well as the polynomials derived from tank measurements to express the open water characteristics of Wageningen propellers with 2 to 7 blades and various P/D.

Hope this helps.

Edit: There's also a publication by Peter van Oossanen and M. W. C. Oosterveld: Further Computer Analysed Data of the Wageningen B-Screw Series from 1975.

Last edited: Aug 24, 2010
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