Experimental Results of Two Highly Skewed Propellers in Ice: Blade and Shaft Load Measurements

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TypeTechnical Report
Series titleTechnical Report
Subjectpropeller-ice interaction; highly skewed propeller; blade loads; ice milling
AbstractTwo highly skewed controllable pitch model propellers were tested in both open water and ice-covered water in an ice tank. Both propellers had the same skew but were manufactured with two different pitch distributions. The open water and ice experiments were both done at four different pitch settings, each over a range of advance coefficients. The ice strength and the depth cut into the ice by the propeller were varied in the tests. The main aims of the experiments were to measure the effects of these variables on blade loads, in addition to their effects on shaft loads, and to compare the effect of pitch distribution on loading. Shaft loads were measured using conventional dynamometry. Loads on one blade were measured using a six component hub-mounted blade dynamometer designed and built for these tests. The blade dynamometer is described and shaft and blade load measurements are presented and discussed. It was discovered that in certain conditions the individual blade experienced bending moments, thrust and torque loads that were on the order of ten times the mean cycle load during the ice milling event.
Publication date
PublisherNational Research Council Canada. Institute for Marine Dynamics
PlaceSt. John's, NL
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedNo
NRC number5256
NPARC number8895180
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Record identifier6310cd97-5fa8-480e-a705-3ad2c07711c8
Record created2009-04-22
Record modified2016-10-03
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