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  1. E

    What prop to use for a 18hp 440cc Duromax engine?

    I forgot to note that I'm building a 2/3 scale BF-109E-4 so to stay scale I want to use a 3 blade 60" prop. What I really need to know is what pitch should I make it to make work. Let's assume my empty weight is 250lbs (theoretically it should weigh even less) and I only weigh 115lbs. My plane...
  2. E

    What prop to use for a 18hp 440cc Duromax engine?

    What size and pitch prop do I need for 18hp 440cc Duromax engine? I plan on direct drive, trying to acheive 65mph cruise speed at 2700 rpm. I know the le Pelican and the Quickie had 18hp engines and were capable of that speed.
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