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Old 01-11-2014, 08:59 AM   #3
AusCan
Guru
 
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City: Adelaide
Vessel Name: Kokanee
Vessel Model: Cuddles 30 Pilot House Motor Sailer
Join Date: Jul 2012
Posts: 3,218
Rick
Thanks for the article.
Obviously the sea state and hull condition affect the propeller slip. I made my measurements with a relatively clean bottom and in fairly calm seas, and was wondering how it compares to other small displacement boats in similar conditions.
I'm thinking that it would be somewhat indicative of a boats hull efficiency.

I often run at constant power in steady state conditions for the entire day, so it might mean something to me. Also - with a motorsailer, when raising the sails while under power, the result is a decrease in prop slip which gives me increased speed and fuel economy. So I have an interest in this.

Yes, it is an academic exercise; but sometimes I like academic excercises.
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