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Thread: Propeller clocking to #1 TDC

  1. #1
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    Default Propeller clocking to #1 TDC

    A high time supercub pilot mentioned that the propeller should be clocked to #1 cylinder TDC to assist in hand propping and balance to the engine firing. The prop should be about 10 o'clock (and 4) when #1 is coming up to the compression cycle.

    Hand propping I don't think we have to worry about, but the balance comment was interesting.

    With the light weight catto prop is there a clocking preference?

    This is on a EX-2.

    Thanks
    Dan Arnold
    KEUL

  2. #2
    Senior Member Dan L's Avatar
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    Default Re: Propeller clocking to #1 TDC

    Quote Originally Posted by aeroaddict View Post
    A high time supercub pilot mentioned that the propeller should be clocked to #1 cylinder TDC to assist in hand propping and balance to the engine firing. The prop should be about 10 o'clock (and 4) when #1 is coming up to the compression cycle.

    Hand propping I don't think we have to worry about, but the balance comment was interesting.

    With the light weight catto prop is there a clocking preference?

    This is on a EX-2.

    Thanks
    72587BB7-7B43-4C4E-ACFA-2399CB1EA36F.jpg

    I like the timing your friend mentioned. It just looks right on a Cub. And if hand propping is ever necessary this is where you want it.

    I donít see how positioning it like this could allow for better balance though. All props should be dynamically balanced in my opinion.
    Flying Carbon Cub EX #11 since 2011

  3. #3
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    Default Re: Propeller clocking to #1 TDC

    Yup, should look just like that. I agree with your balance comment.
    Dan Arnold
    KEUL

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