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Thread: Best prop pitch for C85 with stroker

  1. #1

    Join Date
    Jan 2013
    Hudson, MA
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    Best prop pitch for C85 with stroker

    Wondering about prop recommendations for a C85 Stroker. The existing prop is a 74-46 Sensenich. Would it be worth re-pitching?

  2. #2
    BC12D-4-85's Avatar
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    Feb 2016
    Fairbanks, AK.
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    Depends. What's your static rpm noted by an accurate device? Is it within the airframe manufacturer's limits? What's the inflight maximum rpm again observed with an accurate tach? I prefer a Sen 76AK-2-40 to 42 for my Taylorcraft C85 Stroker (it's now at 40 from a previous 42). It will turn about 2600 in flight slightly over redline but that's controllable.

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  3. #3
    soyAnarchisto's Avatar
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    Aug 2012
    Boulder, CO
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    all of it - you want to make maximum static rpm according to the TCDS limitations and be able to achieve redline on climb out. The metal sensenich is the best one for the C-85 on the J3 anyway. You didn't say what airframe - read your type cert to see what your limitations and prop options are - then talk to your prop shop if you aren't making what you paid for.

  4. #4
    cubdriver2's Avatar
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    Apr 2003
    upstate NY
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    An AK 76-2 is 74" and pitched to a 40 works well

    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  5. #5

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    Sep 2003
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    Sea level guy here - I just use a wood 72/42, and get delightful performance. When I want to see 1300 fpm, I get the Super Decathlon out for a spin.

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