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  1. #1

    Join Date
    Dec 2005
    Wallingford, CT
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    Who makes 3-blade props?

    Hello all,

    I'm trying to find a 3-blade prop to best fit with my Magnum XL 91RFS four stroke engine. I think the ideal 3-blade would be 13x6, 13x7, or 14x6, but I cannot seem to find anyone who makes these size plastic props.

    I know Master Airscrew makes a 13x8, but I think that the extra inch in pitch might be too much. I also know Graupner makes a 12.5x7, which I'm considering, but it's going into a warbird though, so I was hoping for that extra 1/2 - 1 1/2" on the diameter for a more scale look.


  2. #2
    carrellh's Avatar
    Join Date
    Mar 2003
    Garland, TX
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    RE: Who makes 3-blade props?

    There are very few 3 blade props available in the range that might possibly work on a 91 four stroke.

    I found these, and punched the numbers into ThrustHP to get the "load" numbers. In theory, two props with the same load number will turn the same RPM on a given engine.

    Master Airscrew
    13x8 342732
    14x7 403368
    12.5x7 256348
    xoar, wood props
    14x5 288120
    14x6 345744

    For comparison, here are some two blade load numbers
    12x12 248832
    13x9 257049
    14x6 230496
    14x7 268912
    14x8 307328
    15x6 303750
    15x7 354375
    16x6 393216

    Our club is having a kit building contest and my brother and I will be entering a GP 40 size Corsair that is a tribute to the 3rd place Thompson Trophy Winner at the 1949 Cleveland National Air Race. The engine is a 70 four stroke. I'm buying a 16x8 three blade for the static judging and will switch to a 13x6 two blade for the flying competition.
    - Carrell

  3. #3
    Hobbsy's Avatar
    Join Date
    Dec 2001
    Colonial Beach, VA

    RE: Who makes 3-blade props?

    PT, Joe Zingali will put one of these together any way you want it and get it to you quicl]kly.
    Minneapolis Moline G 1350, 585 cubic inches, 141.4 hp, 9.7 GPH fuel use, 4.75 inch bore, 5.50 inch stroke
    CR==15.3 to 1
    Max pull== 14,178
    Front tires==11x15
    Rear tires 24.5x32

    Club Saito member #5

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