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Old 11-25-2010 | 01:15 PM
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apalsson
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Default RE: Three bladed props vs. two bladed props.
ORIGINAL: Barry Cazier

Is cowl width much of a consideration?
Not really. I got used to 3-blade props on my Extra300 where I have a 22x10 Biela on a 56cc engine.
After having used this combination, I changed the prop on my YAK from a 2-blade 23x8 to a 3-blade 22x10. Despite the YAK having a relatively wide cowl opening, my assessment is that I have improved prop efficiency.
Some people like to increase slightly the spacing between the front of the cowl and the back of the prop on planes like YAKs with wide cowls.
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