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03prop_des_det

# 03prop_des_det - Propeller Design(Detail Stage To this...

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Propeller Design (Detail Stage) To this point we have developed the K T vs J 2 (J 4 ) design approach. Most references present the series data in alternative format. One version is curves of constant efficiency and 1/J on a scale of P/D vs B P1 or P/D vs Kq 1/4 *J -5/4 . These are due to D. W. Taylor plotting the series data using B P which we will define later. The best description of use of the forms of the charts I found was in PNA, page 159 Propulsion and Propellers Section 10: Propeller Design, by Karl Schoenherr. The following is excerpted from the text: The procedure in using these charts depends on the nature of the problem to be solved; that is, on which data are known and which are unknown. In general, propeller design problems belong to one of the following categories: 1. Preliminary Design. a. Given: The designed speed of the ship, the corresponding ehp and the propeller diameter .Required: The propeller pitch and the rpm for best efficiency. b. Given: The designed speed of the ship the corresponding ehp and the engine rpm. Required: The propeller pitch and the propeller diameter for best efficiency. 2. Final Design. Given: The ehp curve as a function of the ship speed, the propeller diameter, and the power output of the engine at the designed rpm.

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