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Thread: Dynamic Prop Balancing

  1. #1

    Dynamic Prop Balancing

    It's a personal decision on what is smooth enough. Most (not all)
    folks I know who've had it done will say it's made their engine seem
    smoother. If that's your goal, a good engine shop or tuner can spend
    a lot of money precisely balancing everything. On the flip side, if
    your engine is mid-time or approaching TBO and you've never been
    bothered by the vibration of the 4 cylinder beast, don't bother.
    Bob
    A&P, Aero Eng
    N6504R
    --- In musketeermail@yahoogroups.com, "peter_donofrio"
    <pdonofrio@c...> wrote:
    > Has anyone had any experience with dynamic prop balancing? I have a
    > '76 Sundowner going in for annual and don't know if this is
    > something
    > I should consider having done.
    >
    > Thanks,
    > Peter Donofrio
    > N1945L




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  2. #2

    Dynamic Prop Balancing

    I had mine balanced 3 weeks ago by Harmony Aviation, they travel around
    doing it onsite. http://www.propbalancing.com/index.htm



    The guy did a good job, I decided to do it because I just had the engine
    overhauled and a new prop installed. I can't say it made a huge difference
    but I think it was worth doing for the price, I think it was $175. I did
    find out my tach reads 50 rpm high so that was good to know.



    Randy

    Sundowner N4345W





    _____

    From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]
    On Behalf Of peter_donofrio
    Sent: Friday, July 08, 2005 3:44 PM
    To: musketeermail@yahoogroups.com
    Subject: [musketeermail] Dynamic Prop Balancing



    Has anyone had any experience with dynamic prop balancing? I have a
    '76 Sundowner going in for annual and don't know if this is
    something
    I should consider having done.

    Thanks,
    Peter Donofrio
    N1945L




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  3. #3

    Dynamic Prop Balancing

    I basically second Bob's opinion. I have read reports from people who swear they had terrific results, and I have no reason not to believe them. I have had personal experience with six instances of dynamic prop balancing, on both homebuilts and certified planes, and I could never tell the difference on the 4-cylinder planes. In one case with a big six, it seemed very slightly different, but I'd be hard pressed to call it better. The owner thought it was better, and perhaps it really was.

    Now having said this, I'll add one elaboration, or theory, or whatever it might be. I suspect that the occasional ecstatic report might be due to one (or both) of two factors.

    1. There are quite a few cases in which a prop was improperly "clocked" or "indexed", perhaps for a long time. The prop is off for some maintenance (not necessarily prop maintenance); and the owner decides to have (or is talked into having) it dynamically balanced when it is put back on, and it gets properly installed. It feels noticeably smoother. Most of the improvement was probably due to the proper indexing. Ditto for properly indexing the spinner when it is reinstalled.

    2. The prop has been getting nicks dressed out of the leading edge and thrust face for ten or fifteen years. And-or a Constant-Speed Prop has been getting grease added for some length of time. A dynamic balance compensates for all the small spots of aluminum removal; or temporarily compensates for changes in the grease content and distribution.

    At any rate, if you don't see your wingtips and stab tips buzzing in cruise (as opposed to during start-up, low idle, and shut-down), and if your plane seems little different from its peers in the vibration department, you might want to put the money in the 396 kitty instead.

    ----- Original Message -----
    From: Bob Swaim
    To: musketeermail@yahoogroups.com
    Sent: Saturday, July 09, 2005 9:40 AM
    Subject: [musketeermail] Re: Dynamic Prop Balancing


    It's a personal decision on what is smooth enough. Most (not all)
    folks I know who've had it done will say it's made their engine seem
    smoother. If that's your goal, a good engine shop or tuner can spend
    a lot of money precisely balancing everything. On the flip side, if
    your engine is mid-time or approaching TBO and you've never been
    bothered by the vibration of the 4 cylinder beast, don't bother.
    Bob
    A&P, Aero Eng
    N6504R

    --- In musketeermail@yahoogroups.com, "peter_donofrio"
    <pdonofrio@c...> wrote:
    > Has anyone had any experience with dynamic prop balancing? I have a
    > '76 Sundowner going in for annual and don't know if this is
    > something
    > I should consider having done.
    >
    > Thanks,
    > Peter Donofrio
    > N1945L

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



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  4. #4

    Dynamic Prop Balancing

    Now I can tell you that there IS a difference and I
    have had the props balanced of 3 of my airplanes and
    they DO run smoother.
    In addition to that, I feel there is a VERY
    interesting by-product of the test because the test
    shows also harmonics all the way up to 20K and a REAL
    prop balance expert can tell you what you engine is
    doing. It will tell you the condition of your
    magneto's, spark plugs, engine and a variety of other
    data. That information is based on having done tests
    on hundreds or maybe thousands of engines. The guy
    that does mine is is Brian the owner of Sullivan's
    Propellor Shop in Hayward and he does them all, all
    the way from WW2 heavy stuff to the little 100 Horse 4
    bangers. I personally have seen a WW2 airplane that
    shook soo much , the pilot could not read the gauges -
    no kidding- to a smooth running practically zero
    vibration airplane in a matter of 2 hours.
    Cheers
    HarryR
    --- Mike Rellihan <rellihan@rellihan.com> wrote:

    > I basically second Bob's opinion. I have read
    > reports from people who swear they had terrific
    > results, and I have no reason not to believe them.
    > I have had personal experience with six instances of
    > dynamic prop balancing, on both homebuilts and
    > certified planes, and I could never tell the
    > difference on the 4-cylinder planes. In one case
    > with a big six, it seemed very slightly different,
    > but I'd be hard pressed to call it better. The
    > owner thought it was better, and perhaps it really
    > was.
    >
    > Now having said this, I'll add one elaboration, or
    > theory, or whatever it might be. I suspect that the
    > occasional ecstatic report might be due to one (or
    > both) of two factors.
    >
    > 1. There are quite a few cases in which a prop was
    > improperly "clocked" or "indexed", perhaps for a
    > long time. The prop is off for some maintenance
    > (not necessarily prop maintenance); and the owner
    > decides to have (or is talked into having) it
    > dynamically balanced when it is put back on, and it
    > gets properly installed. It feels noticeably
    > smoother. Most of the improvement was probably due
    > to the proper indexing. Ditto for properly indexing
    > the spinner when it is reinstalled.
    >
    > 2. The prop has been getting nicks dressed out of
    > the leading edge and thrust face for ten or fifteen
    > years. And-or a Constant-Speed Prop has been
    > getting grease added for some length of time. A
    > dynamic balance compensates for all the small spots
    > of aluminum removal; or temporarily compensates for
    > changes in the grease content and distribution.
    >
    > At any rate, if you don't see your wingtips and stab
    > tips buzzing in cruise (as opposed to during
    > start-up, low idle, and shut-down), and if your
    > plane seems little different from its peers in the
    > vibration department, you might want to put the
    > money in the 396 kitty instead.
    >
    > ----- Original Message -----
    > From: Bob Swaim
    > To: musketeermail@yahoogroups.com
    > Sent: Saturday, July 09, 2005 9:40 AM
    > Subject: [musketeermail] Re: Dynamic Prop
    > Balancing
    >
    >
    > It's a personal decision on what is smooth enough.
    > Most (not all)
    > folks I know who've had it done will say it's made
    > their engine seem
    > smoother. If that's your goal, a good engine shop
    > or tuner can spend
    > a lot of money precisely balancing everything. On
    > the flip side, if
    > your engine is mid-time or approaching TBO and
    > you've never been
    > bothered by the vibration of the 4 cylinder beast,
    > don't bother.
    > Bob
    > A&P, Aero Eng
    > N6504R
    >
    > --- In musketeermail@yahoogroups.com,
    > "peter_donofrio"
    > <pdonofrio@c...> wrote:
    > > Has anyone had any experience with dynamic prop
    > balancing? I have a
    > > '76 Sundowner going in for annual and don't know
    > if this is
    > > something
    > > I should consider having done.
    > >
    > > Thanks,
    > > Peter Donofrio
    > > N1945L
    >
    > [Non-text portions of this message have been
    > removed]
    >
    >




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  5. #5

    Dynamic Prop Balancing

    Mike, what is proper indexing of the prop and the spinner? Please
    elaborate.

    Larry Stetz


    --- In musketeermail@yahoogroups.com, "Mike Rellihan"
    <rellihan@r...> wrote:
    > I basically second Bob's opinion. I have read reports from people
    who swear they had terrific results, and I have no reason not to
    believe them. I have had personal experience with six instances of
    dynamic prop balancing, on both homebuilts and certified planes, and
    I could never tell the difference on the 4-cylinder planes. In one
    case with a big six, it seemed very slightly different, but I'd be
    hard pressed to call it better. The owner thought it was better,
    and perhaps it really was.
    >
    > Now having said this, I'll add one elaboration, or theory, or
    whatever it might be. I suspect that the occasional ecstatic report
    might be due to one (or both) of two factors.
    >
    > 1. There are quite a few cases in which a prop was
    improperly "clocked" or "indexed", perhaps for a long time. The
    prop is off for some maintenance (not necessarily prop maintenance);
    and the owner decides to have (or is talked into having) it
    dynamically balanced when it is put back on, and it gets properly
    installed. It feels noticeably smoother. Most of the improvement
    was probably due to the proper indexing. Ditto for properly
    indexing the spinner when it is reinstalled.
    >
    > 2. The prop has been getting nicks dressed out of the leading
    edge and thrust face for ten or fifteen years. And-or a Constant-
    Speed Prop has been getting grease added for some length of time. A
    dynamic balance compensates for all the small spots of aluminum
    removal; or temporarily compensates for changes in the grease
    content and distribution.
    >
    > At any rate, if you don't see your wingtips and stab tips buzzing
    in cruise (as opposed to during start-up, low idle, and shut-down),
    and if your plane seems little different from its peers in the
    vibration department, you might want to put the money in the 396
    kitty instead.
    >
    > ----- Original Message -----
    > From: Bob Swaim
    > To: musketeermail@yahoogroups.com
    > Sent: Saturday, July 09, 2005 9:40 AM
    > Subject: [musketeermail] Re: Dynamic Prop Balancing
    >
    >
    > It's a personal decision on what is smooth enough. Most (not
    all)
    > folks I know who've had it done will say it's made their engine
    seem
    > smoother. If that's your goal, a good engine shop or tuner can
    spend
    > a lot of money precisely balancing everything. On the flip
    side, if
    > your engine is mid-time or approaching TBO and you've never been
    > bothered by the vibration of the 4 cylinder beast, don't bother.
    > Bob
    > A&P, Aero Eng
    > N6504R
    >
    > --- In musketeermail@yahoogroups.com, "peter_donofrio"
    > <pdonofrio@c...> wrote:
    > > Has anyone had any experience with dynamic prop balancing? I
    have a
    > > '76 Sundowner going in for annual and don't know if this is
    > > something
    > > I should consider having done.
    > >
    > > Thanks,
    > > Peter Donofrio
    > > N1945L
    >
    > [Non-text portions of this message have been removed]




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  6. #6

    Dynamic Prop Balancing

    Please do a BAC search on "prop indexing" (without the quotes). It has been addressed repeatedly, and all the info you need is there.

    ----- Original Message -----
    From: hamlej1
    To: musketeermail@yahoogroups.com
    Sent: Saturday, July 09, 2005 10:19 PM
    Subject: [musketeermail] Re: Dynamic Prop Balancing


    Mike, what is proper indexing of the prop and the spinner? Please
    elaborate.

    Larry Stetz


    --- In musketeermail@yahoogroups.com, "Mike Rellihan"
    <rellihan@r...> wrote:
    > I basically second Bob's opinion. I have read reports from people
    who swear they had terrific results, and I have no reason not to
    believe them. I have had personal experience with six instances of
    dynamic prop balancing, on both homebuilts and certified planes, and
    I could never tell the difference on the 4-cylinder planes. In one
    case with a big six, it seemed very slightly different, but I'd be
    hard pressed to call it better. The owner thought it was better,
    and perhaps it really was.
    >
    > Now having said this, I'll add one elaboration, or theory, or
    whatever it might be. I suspect that the occasional ecstatic report
    might be due to one (or both) of two factors.
    >
    > 1. There are quite a few cases in which a prop was
    improperly "clocked" or "indexed", perhaps for a long time. The
    prop is off for some maintenance (not necessarily prop maintenance);
    and the owner decides to have (or is talked into having) it
    dynamically balanced when it is put back on, and it gets properly
    installed. It feels noticeably smoother. Most of the improvement
    was probably due to the proper indexing. Ditto for properly
    indexing the spinner when it is reinstalled.
    >
    > 2. The prop has been getting nicks dressed out of the leading
    edge and thrust face for ten or fifteen years. And-or a Constant-
    Speed Prop has been getting grease added for some length of time. A
    dynamic balance compensates for all the small spots of aluminum
    removal; or temporarily compensates for changes in the grease
    content and distribution.
    >
    > At any rate, if you don't see your wingtips and stab tips buzzing
    in cruise (as opposed to during start-up, low idle, and shut-down),
    and if your plane seems little different from its peers in the
    vibration department, you might want to put the money in the 396
    kitty instead.
    >
    > ----- Original Message -----
    > From: Bob Swaim
    > To: musketeermail@yahoogroups.com
    > Sent: Saturday, July 09, 2005 9:40 AM
    > Subject: [musketeermail] Re: Dynamic Prop Balancing
    >
    >
    > It's a personal decision on what is smooth enough. Most (not
    all)
    > folks I know who've had it done will say it's made their engine
    seem
    > smoother. If that's your goal, a good engine shop or tuner can
    spend
    > a lot of money precisely balancing everything. On the flip
    side, if
    > your engine is mid-time or approaching TBO and you've never been
    > bothered by the vibration of the 4 cylinder beast, don't bother.
    > Bob
    > A&P, Aero Eng
    > N6504R
    >
    > --- In musketeermail@yahoogroups.com, "peter_donofrio"
    > <pdonofrio@c...> wrote:
    > > Has anyone had any experience with dynamic prop balancing? I
    have a
    > > '76 Sundowner going in for annual and don't know if this is
    > > something
    > > I should consider having done.
    > >
    > > Thanks,
    > > Peter Donofrio
    > > N1945L

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



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