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Thread: Climb prop on 49C?

  1. #1

    Climb prop on 49C?

    Browsing the posts on the BAC site after deciding to join, I ran
    across a topic that interested me because of poor cruise performance
    on 6349C, a 1983 model Sundowner.

    I find while climbing I must keep the nose high and speed close to
    80kts where I see about 2500 RPM on the tach. Let the speed creep up
    to 90+ and it's on redline. When I level out I must reduce power
    before or simultaneously with lowering the nose for the same reason.

    In cruise, 2700 RPM gives me between 100 and 105 kts IAS at 6000,
    while 2500 only gives me about 97 kts. Since i just flew from NH
    (ASH) to TX (TKI) against 35 kt headwinds, you can imagine that I'd
    like some more speed.

    In the BAC posts I just ran across several people complaining that
    their x23's could only get 2300 in level flight, and a discussion of
    repitching props to get more. One person wrote he'd never heard of
    Sundowner pilots having trouble reaching max RPM's in level flight.
    This is so opposite to my experience, I have to ask for the wisdom of
    the assembled (y'all).

    Could it be that I a) have a climb prop; 2) have the wrong prop; or
    3) need an overhaul, or 4) something else? I only bought Charlie in
    May, and have put about 40 hours on him since.

    pilot2724@yahoo.com





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  2. #2

    Climb prop on 49C?

    I don't have any problems with RPMs that I know of. I had my tach checked against a digital tach - <50 RPM difference - back when I had the prop balanced at one of our fly ins. You might have the accuracy of your tach checked before spending money on re-pitching.
    As for speeds, your speeds look pretty close. I do all my planning at 100 kts. I do get 105 - 115 IAS at 2550 - 2600 rpm depending on altitude and season. I normally fly at 1500 msl to/from work and on trips up between 4500-7500 msl where she indicates 95-105 depending on temps. Our birds are not known for their speed - "slowdowners". They are known for their craftsmanship and comfort - "Baby Beeches". And for the average weekend trip, I'll trade the 10 - 20 minutes I get beat for the comfort, load, and roominess of my bird any day.
    I have 49Q, a 71 C-23, the second Sundowner off the Beech factory line.
    Blue Skies,
    Chuz
    BAC SE Region Director


    -----Original Message-----
    From: pilot2724@yahoo.com
    To: musketeermail@yahoogroups.com
    Sent: Tue, 24 Oct 2006 4:59 PM
    Subject: [musketeermail] Climb prop on 49C?


    Browsing the posts on the BAC site after deciding to join, I ran
    across a topic that interested me because of poor cruise performance
    on 6349C, a 1983 model Sundowner.

    I find while climbing I must keep the nose high and speed close to
    80kts where I see about 2500 RPM on the tach. Let the speed creep up
    to 90+ and it's on redline. When I level out I must reduce power
    before or simultaneously with lowering the nose for the same reason.

    In cruise, 2700 RPM gives me between 100 and 105 kts IAS at 6000,
    while 2500 only gives me about 97 kts. Since i just flew from NH
    (ASH) to TX (TKI) against 35 kt headwinds, you can imagine that I'd
    like some more speed.

    In the BAC posts I just ran across several people complaining that
    their x23's could only get 2300 in level flight, and a discussion of
    repitching props to get more. One person wrote he'd never heard of
    Sundowner pilots having trouble reaching max RPM's in level flight.
    This is so opposite to my experience, I have to ask for the wisdom of
    the assembled (y'all).

    Could it be that I a) have a climb prop; 2) have the wrong prop; or
    3) need an overhaul, or 4) something else? I only bought Charlie in
    May, and have put about 40 hours on him since.

    pilot2724@yahoo.com



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