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Thread: Torque ? Wood prop, Continental IO-240

  1. #1

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    Default Torque ? Wood prop, Continental IO-240

    Hello everyone,
    I bought a crashed kitfox 5 with an IO-240 in it, and rebuilt the plane in the past few months.
    I purchased a new propeller from pros inc.

    I was wondering if I can have some information shared about the torque settings for the prop bolts. What should I torque them to? then, how often should I re-tighted, or check them.

  2. #2
    Senior Member efwd's Avatar
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    Default Re: Torque ? Wood prop, Continental IO-240

    Your going to need to let one know what prop and engine combination your using to get your answer. Congrats on nearing completion.

  3. #3
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    Default Re: Torque ? Wood prop, Continental IO-240

    Doesn't the prop manufacturer have torque info available? JImChuk

  4. #4
    Senior Member jrevens's Avatar
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    Default Re: Torque ? Wood prop, Continental IO-240

    Jim's right... every propeller I've ever bought, whether wood, composite or metal has had available recommended torque values. Wood props, especially, will vary depending on type of wood, composition & other factors. That is one area you'd be very wise to avoid guessing about. Follow the manufacturer's recommendations/specifications.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

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    Default Re: Torque ? Wood prop, Continental IO-240

    Quote Originally Posted by jrevens View Post
    Jim's right... every propeller I've ever bought, whether wood, composite or metal has had available recommended torque values. Wood props, especially, will vary depending on type of wood, composition & other factors. That is one area you'd be very wise to avoid guessing about. Follow the manufacturer's recommendations/specifications.
    Thanks guys I'll contact props incorporated.

  6. #6

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    Default Re: Torque ? Wood prop, Continental IO-240

    Quote Originally Posted by jrevens View Post
    Jim's right... every propeller I've ever bought, whether wood, composite or metal has had available recommended torque values. Wood props, especially, will vary depending on type of wood, composition & other factors. That is one area you'd be very wise to avoid guessing about. Follow the manufacturer's recommendations/specifications.
    I found out. Any where between 4 and 6 ft lbs.

  7. #7
    Senior Member PapuaPilot's Avatar
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    Default Re: Torque ? Wood prop, Continental IO-240

    Do you have the torque sequence and is it done in increments?
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5 Outback, Cont. IO-240
    Flying since 2016

  8. #8
    Senior Member jrevens's Avatar
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    Default Re: Torque ? Wood prop, Continental IO-240

    Quote Originally Posted by kitfoxJeff View Post
    I found out. Any where between 4 and 6 ft lbs.
    I sure don't want to muddy the waters, but that sure sounds like a VERY low torque spec for a wood prop. Do you know what kind of wood it is made of? Hard Maple is one of the common woods used by some manufacturers. Are you using a face ("crush") plate? What size bolts?

    Here are some common propeller brands in the Experimental world, and their recommended torque values for wood props, 3/8" bolts and a crush plate -

    Sensenich : 15 to 19 ft. lbs.
    Aymar-DeMuth : 18 ft. lbs.
    Pacesetter : 25 ft. lbs.
    Prince : 17.5 ft. lbs.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  9. #9
    Senior Member PapuaPilot's Avatar
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    Default Re: Torque ? Wood prop, Continental IO-240

    Good point John. The torque on my Catto prop is 25 ft-lb.
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5 Outback, Cont. IO-240
    Flying since 2016

  10. #10
    Senior Member jiott's Avatar
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    Default Re: Torque ? Wood prop, Continental IO-240

    This sure is one area where you want to get it right! There are many stories of a prop coming off in flight.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

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