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Old 07-13-2015, 04:24 AM
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Originally Posted by 52larry52 View Post
Bobby Mcgee, From Master Airscrew props, "2-blade to 3-blade conversion: decrease the diameter by 1" and increase the pitch by 1" if possible. Adjust to 2" for larger diameters (14" and up)." SO, I guess it depends on what brand of prop's instructions you want to follow. It looks like, as with so many other things in this hobby, there is more than one "right "answer. My conclusion is, "I guess it doesn't matter that much".
Let's be complete here. Master Airscrew also says "It is all right to keep the same pitch when going from 2 blade to 3." I think you're right that it's not a big deal. Even when not changing the number of blades, a one-inch pitch change doesn't usually affect performance much. When you go from two blades to three, a lot of times you're also changing brands and maybe blade shape, so the important thing is to see what works. The "reduce diameter by one inch and ..." is just a starting point.