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Thread: Sundowner Wheel Pants - PowerFlow Exhaust - will they help?

  1. #1

    Sundowner Wheel Pants - PowerFlow Exhaust - will they help?

    On Sat Dec 3 20:43 , David Vance sent:

    You might recall my post asking whether the average Musketeer could attain
    2700 rpm at 8000 feet. The reason behind the question is that the PFS
    exhaust is supposed to provide an extra 200 rpm at cruise altitude.
    Obviously if the average Mouse can already attain redline rpm at altitude,
    there is no need for a fancy exhaust system.

    ---
    Hmmm - my Sport is only 150HP, and it has the original 58" prop.

    Level at about 5,500 ft, the engine pulls about 50 RPM over redline (2,700 RPM)
    at wide open throttle (WOT.) I have a 4-cylinder graphic engine analyzer, and
    the mixtures are very even. I bought an electronic tach, and my mechanical tach
    is pretty close.

    If I pull back the throttle that little bit to bring the RPMs back to the
    redline, the mixtures become very uneven.

    So, over several months last year, we all talked about what that meant, and what
    could be done. Obviously, I could get the prop twisted a little bit - out to
    60", but that would make the climb even 'less' than what I get now.

    There's some 'documentation' that indicates that I should actually change the
    prop to 56" or less, or reduce the GW to 2,000 lbs to get better climb. NOT an
    option.

    So, the picture is, if I had more HP, or if the plane was 'sleeker' the same prop
    would be overrevving MORE than before, and I'd have to pull the throttle back
    even more.

    So it seems to me, I can't go any faster than the plane will fly now, even if I
    had more horsepower or a sleeker plane, cause I'd have to pull the throttle back
    to keep from over-revving, with the associated uneven mixtures.

    Jeff, what did you do with your prop?

    Bill Howard
    BeechSportBill
    N1927W 1973 Sport 150
    Beech Aero Club NorthWest Region Director

    P.S. A little birdy told me the prop was OK out to 2,800 RPM, and I know that the
    engine actually LIKES to run WOT (SMOOTH!,) as long as I'm not heading downhill
    aand go any farther over that 2,750 in level flight.
    ---- Msg sent via @bmi.net Mail v4 - http://www.bmi.net


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  2. #2

    Sundowner Wheel Pants - PowerFlow Exhaust - will they help?

    My IO346A would overrev if I went to full throttle at altitude. I found a rebuilt propeller in Trade-A-Plane that fit, I think it is 73X60 and installed it. It helped brought my cruise at 2500 rpm up from 99/100 knots to 104/105 knots. It didn't hurt my takeoff and climb enough to measure. My old prop was about an inch short and the tips were rounded from 4000 hours or so of use. It now lives in my garage as my wife doesn't like it for an interior decoration and a prop shop would no doubt red line it. More power is always better, but you need for the prop to absorb it.

    Bill Howard <bhoward@bmi.net> wrote:
    On Sat Dec 3 20:43 , David Vance sent:

    You might recall my post asking whether the average Musketeer could attain
    2700 rpm at 8000 feet. The reason behind the question is that the PFS
    exhaust is supposed to provide an extra 200 rpm at cruise altitude.
    Obviously if the average Mouse can already attain redline rpm at altitude,
    there is no need for a fancy exhaust system.

    ---
    Hmmm - my Sport is only 150HP, and it has the original 58" prop.

    Level at about 5,500 ft, the engine pulls about 50 RPM over redline (2,700 RPM)
    at wide open throttle (WOT.) I have a 4-cylinder graphic engine analyzer, and
    the mixtures are very even. I bought an electronic tach, and my mechanical tach
    is pretty close.

    If I pull back the throttle that little bit to bring the RPMs back to the
    redline, the mixtures become very uneven.

    So, over several months last year, we all talked about what that meant, and what
    could be done. Obviously, I could get the prop twisted a little bit - out to
    60", but that would make the climb even 'less' than what I get now.

    There's some 'documentation' that indicates that I should actually change the
    prop to 56" or less, or reduce the GW to 2,000 lbs to get better climb. NOT an
    option.

    So, the picture is, if I had more HP, or if the plane was 'sleeker' the same prop
    would be overrevving MORE than before, and I'd have to pull the throttle back
    even more.

    So it seems to me, I can't go any faster than the plane will fly now, even if I
    had more horsepower or a sleeker plane, cause I'd have to pull the throttle back
    to keep from over-revving, with the associated uneven mixtures.

    Jeff, what did you do with your prop?

    Bill Howard
    BeechSportBill
    N1927W 1973 Sport 150
    Beech Aero Club NorthWest Region Director

    P.S. A little birdy told me the prop was OK out to 2,800 RPM, and I know that the
    engine actually LIKES to run WOT (SMOOTH!,) as long as I'm not heading downhill
    aand go any farther over that 2,750 in level flight.
    ---- Msg sent via @bmi.net Mail v4 - http://www.bmi.net



    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

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    [Non-text portions of this message have been removed]



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  3. #3

    Sundowner Wheel Pants - PowerFlow Exhaust - will they help?

    Well.

    The Long Beach ACO has approved the use of a 74DM6S5-0-58 prop for my sport
    at 2150lbs and the 160hp engine. I am waiting for the paperwork from them
    with the approval before I run out and get a new prop. Their main concern
    was, now get this, NOISE. Changing the prop to 58" will produce more noise
    and the ACO was concerned it might not pass FAR 36 requirements. Never mind
    that there are 10,000 airplanes out there with an 0-320 and Sensenich 58"
    prop.

    Anyway, that's are Tax dollars at work.

    I hope to have the prop by April.

    Jeff




    _____

    From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]
    On Behalf Of Bill Howard
    Sent: Saturday, December 03, 2005 10:00 PM
    To: mike@rellihan.com; musketeermail@yahoogroups.com;
    bac-mail@beechaeroclub.org; David Vance
    Subject: [musketeermail] Re: Sundowner Wheel Pants - PowerFlow Exhaust -
    will they help?



    On Sat Dec 3 20:43 , David Vance sent:

    You might recall my post asking whether the average Musketeer could attain
    2700 rpm at 8000 feet. The reason behind the question is that the PFS
    exhaust is supposed to provide an extra 200 rpm at cruise altitude.
    Obviously if the average Mouse can already attain redline rpm at altitude,
    there is no need for a fancy exhaust system.

    ---
    Hmmm - my Sport is only 150HP, and it has the original 58" prop.

    Level at about 5,500 ft, the engine pulls about 50 RPM over redline (2,700
    RPM)
    at wide open throttle (WOT.) I have a 4-cylinder graphic engine analyzer,
    and
    the mixtures are very even. I bought an electronic tach, and my mechanical
    tach
    is pretty close.

    If I pull back the throttle that little bit to bring the RPMs back to the
    redline, the mixtures become very uneven.

    So, over several months last year, we all talked about what that meant, and
    what
    could be done. Obviously, I could get the prop twisted a little bit - out
    to
    60", but that would make the climb even 'less' than what I get now.

    There's some 'documentation' that indicates that I should actually change
    the
    prop to 56" or less, or reduce the GW to 2,000 lbs to get better climb. NOT
    an
    option.

    So, the picture is, if I had more HP, or if the plane was 'sleeker' the same
    prop
    would be overrevving MORE than before, and I'd have to pull the throttle
    back
    even more.

    So it seems to me, I can't go any faster than the plane will fly now, even
    if I
    had more horsepower or a sleeker plane, cause I'd have to pull the throttle
    back
    to keep from over-revving, with the associated uneven mixtures.

    Jeff, what did you do with your prop?

    Bill Howard
    BeechSportBill
    N1927W 1973 Sport 150
    Beech Aero Club NorthWest Region Director

    P.S. A little birdy told me the prop was OK out to 2,800 RPM, and I know
    that the
    engine actually LIKES to run WOT (SMOOTH!,) as long as I'm not heading
    downhill
    aand go any farther over that 2,750 in level flight.
    ---- Msg sent via @bmi.net Mail v4 - http://www.bmi.net


    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org





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