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  1. #1

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    Upgrade for a OS Max 60FP

    Hello Bax,

    I scored a beautiful NIB OS Max 60FP at a Swap Meete last weekend. It is planned to be used in a BTE Models Venture 60. After looking the engine over, it looks like the 60A carb had a relatively small throat (even smaller than the 55AX). Would any of the later OS carbs would be a better fit for this engine and perhaps give it a boost and a little more spirit?

    Would you have a recommendation as to the best prop for this engine and sport aircraft combination?

    Thanks for your help,

    Bob
    Club Saito #61 Cub Brotherhood #107
    Spitfire Brotherhood #143
    Kadet Brotherhood #3

  2. #2
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    RE: Upgrade for a OS Max 60FP

    For propeller, an 11 x 7, 11 x 8, or 12 x 6 would be good ones to start with, and go from there. See how the engine runs and the airplane flies. Prop it to run in the high 11,000's or better when leaned to just rich of peak RPM while on the ground.

    As far as the carb is concerned, OS didn't really make any others that fit. The small venturi is needed to give good handling as well as a good fuel draw. Go to a larger intake venturi, and you'll lose some of the very nice handling characteristics.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com

  3. #3

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    RE: Upgrade for a OS Max 60FP

    hi
    what i am doing is using the remote neelde valve and opening the stock one 4 turns out save those fingers

    http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXFJY5

  4. #4

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    RE: Upgrade for a OS Max 60FP

    Thanks Bax, I'll keep that advice. I wasn't expecting the plane to become an instant fire breather with a change of carb, just looking to gain a larger prop or a few more RPM. I appreciate the advice and will prop it so. I might even try a lower pitch 13" if the plane can take the diameter. I'm betting that the 12x6 will be the one, though.

    And thanks for the idea on the RNV. I think that I might have one.

    Bob
    Club Saito #61 Cub Brotherhood #107
    Spitfire Brotherhood #143
    Kadet Brotherhood #3


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