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Old 03-10-2012
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Re: Propeller drag test under sail.

Originally Posted by CalebD View Post
Very clever testing as usual and it seems quite conclusive for 3 blade fixed props.
I'm not sure this test answers the same question for my fixed 2 blade prop that is mounted in the dead wood in a cutaway in front of our rudder. With this configuration we can align the prop with the hull theoretically 'hiding' it from being a real drag.
Do you know of any studies that might have been done on fixed 2 blade props with this configuration?
Thanks in advance, as always.
Pretty hard to test that, and I would guess with a two blade the differences would be less "dramatic", but one thing I have learned is that if the prop begins to spin:

1- It is not as hidden as you thought

2- Is taking the path of least resistance

When we had a Cape Dory 27 with two blade even after I aligned it vertical it would still begin to spin...
-Maine Sail / CS-36T

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