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Thread: Let's compare Pacer cruise speeds

  1. #21
    mmoyle's Avatar
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    Default Re: Let's compare Pacer cruise speeds

    The article about the engine build was on Lyconís Web site. Donít see it today.


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  2. #22

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    Default Re: Let's compare Pacer cruise speeds

    Could you please explain what a ďnon integral camshaftĒ is? Iíve never heard the term.
    Thanks!

  3. #23
    Administrator Steve Pierce's Avatar
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    Default Re: Let's compare Pacer cruise speeds

    Quote Originally Posted by FLFlyer View Post
    Could you please explain what a “non integral camshaft” is? I’ve never heard the term.
    Thanks!
    The cam and gear are cast together unlike the early cams where the gear bolted on. From my conversations with Ken at LyCon I was under the impression that new cams from Lycoming have the same duration on both intake and exhaust but the older cams have 20 degree more duration on the intake I believe which gives better low end torque.

  4. #24

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    Default Re: Let's compare Pacer cruise speeds

    Thanks Steve, now I know!

  5. #25
    ysifly2's Avatar
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    Default Re: Let's compare Pacer cruise speeds



    It was too nice out today to not skip out of work and take advantage of it. Started the day flying, with my dad and son along, to airport restaurant for breakfast, and was so smooth thought maybe a good day to do a speed check run.

    So, we topped off the tanks and off we went.

    PA22/20-150
    Approx 100lbs shy of gross.
    Prop: McCauley 7459
    Rpm: 2450
    Alt: 3000 ft
    No wheel pants - 6x6
    No fairings installed
    3 legged Triangle route
    Took three parameter checks along each path to average out

    Ground temp: 70f
    Barometer: 30.22

    Results:
    Average IAS 120 mph
    True AS calc: 126 mph
    Average GPS ground speed: 125.2 mph




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  6. #26

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    Default Re: Let's compare Pacer cruise speeds

    Quote Originally Posted by ysifly2 View Post
    Prop: McCauley 7459

    Average IAS 120 mph
    True AS calc: 126 mph
    Average GPS ground speed: 125.2 mph
    I'm curious about your McCauley 7459 prop. My Sensenich is stamped 74MDM6-0-58, but the measurements at the 75% station line indicates approximately 60", from memory. Do I take it your McCauley measures 59" at this point? Also, does anyone know offhand what propellers are legal for installation on PA-22's? Where is this documented?

  7. #27
    ysifly2's Avatar
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    Default Re: Let's compare Pacer cruise speeds

    Quote Originally Posted by Subsonic View Post
    I'm curious about your McCauley 7459 prop. My Sensenich is stamped 74MDM6-0-58, but the measurements at the 75% station line indicates approximately 60", from memory. Do I take it your McCauley measures 59" at this point? Also, does anyone know offhand what propellers are legal for installation on PA-22's? Where is this documented?
    Iíve never tried to measure a prop... so am only going by whatís stamped on it.
    Legal propellers list in type cert.
    McCauley covered by an STC.

    Bryan


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  8. #28
    CamTom12's Avatar
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    Default Re: Let's compare Pacer cruise speeds

    Quote Originally Posted by ysifly2 View Post
    Iíve never tried to measure a prop... so am only going by whatís stamped on it.
    Legal propellers list in type cert.
    McCauley covered by an STC.

    Bryan


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    Might have been repitched?

  9. #29

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    Default Re: Let's compare Pacer cruise speeds

    If a prop has been repitched, it will be stamped on the hub. You need to go to the specific manual for any given prop to determine where the pitch measurement is taken. It isnít always at the 75% location.


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  10. #30
    ysifly2's Avatar
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    Default Re: Let's compare Pacer cruise speeds

    Quote Originally Posted by dgapilot View Post
    If a prop has been repitched, it will be stamped on the hub. You need to go to the specific manual for any given prop to determine where the pitch measurement is taken. It isn’t always at the 75% location.
    i'm not questioning if my prop has been re-pitched or not, as far as information I have, the propeller is as it was manufactured. I was just including the prop information in my data set for the speed check I had done.

    According to the McCauley owners manual, for this prop, the pitch number does indicate pitch at .75 radius.


    Bryan

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