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Old 09-15-2016, 08:59 AM   #21
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Quote:
Originally Posted by djmarchand View Post
Fewer blades result in less blade area, so to compensate you have to add pitch.


David
Very obvious to you and I....but not others.
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Old 09-15-2016, 09:03 AM   #22
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David, Thanks for a nice deductive job. I think you are right on based on some figuring using the "Propeller Handbook"
Whenever I have run my boat through a calculator, it always seems to want to come up with a 22x20 3 blade, which I always assume is the same as my 22x18 4 blade as far as load is concerned.
So if I can't get 3" pitch taken off this prop, I'll sell it...
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Old 09-15-2016, 02:22 PM   #23
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"Fewer blades result in less blade area, so to compensate you have to add pitch."

Only so much blade area is required to put a certain HP in the water.

Any extra is just more drag. Thats why there are 2blade 3 blade 4 blade 5 blade ,,,,,,
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