[Electric Boats] Prop load...vs....Motor load

 

Unless I missed someone else making a comment, I think the information related to airplane props and how they are tested in both static and inflight conditions is exactly the same as a boat.
The term "unload" is used to describe the difference in power to turn the prop in a static condition, (such as being secured on a test bench) and the power to turn the prop at the same rpm in flight (or forward movement in a boat) if the craft is moving the power needs at the motor will always be less.

I'm sure there are bits of info about this in boat papers, but the principle is enough alike, that a study of aircraft props (fullsize or model) will give a good understanding of energy consumption.

Ron

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