Surface piercing propeller performance
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Authors
Peterson, Derek T.
Subjects
Advisors
Papoulias, Fotis
Date of Issue
2005-09
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
This thesis addresses possible improvements in the efficiency (thrust) of surface piercing propellers; in particular with respect to the angle of the propeller shaft came to mind. Preliminary calculations based on the basic pitch/diameter geometry suggest that about 3-5% efficiency is lost if the shaft is parallel to the flow, compared to skewed a few degrees in the "paddlewheel" direction at certain speeds. More accurate calculations based on the lift characteristics of each blade, on the angle of attack and the flow of water over each blade and given a set of basic assumption on the over all performance of each blade, as the blade enters and leaves the water; are used to determine the increase in efficiency. Full scale experimental results are also presented in support of the calculations.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Astronautical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
xiv, 53 p. : col. ill. ;
Citation
Distribution Statement
Approved for public release; distribution is unlimited.