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jkreidler
Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI
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 Posted: Tue Aug 02, 2011 4:36 am Post subject: Static Prop Balancing |
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Before having our prop dynamically balanced I would like to balance it statically. After all it doesn't much make sense to make a dynamic correction for a static condition that will change over time as the prop is dressed for various reasons.
I found an article on EAA's site about balancing, but the apparatus they used requires a hole through the prop hub, which we do not have. Does anyone have any experience doing a static balance on a two blade Hartzell prop? I would just take it into a prop shop to have it done, but if it is simple I would like to check at each annual.
http://www.eaa.org/experimenter/articles/2009-11_howto_props.asp
Thoughts and tips appreciated.
Thanks, Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Wayne Elsner, Kyle Hokel, Tony Kolar, Jason Kreidler
N44YH - #40617 - Flying [quote][b]
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_________________
Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler
N44YH - Flying - #40617 |
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Tue Aug 02, 2011 5:07 am Post subject: Static Prop Balancing |
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Your prop is statically balanced when it is made and when it is
overhauled by a prop shop. It should not need any further static
balancing. I don't believe there is any simple way for you to check that
balance on a constant speed prop. Your dynamic prop balance technician
will be able to tell immediately if the static balance isn't close
enough for him to be able to do the dynamic balance. He will tell you to
take the prop to a prop shop and have them do a static balance. Not a
normal problem unless someone has been overly aggressive filing out a
ding in one prop blade.
On 8/2/2011 5:32 AM, jason.kreidler(at)regalbeloit.com wrote:
| Quote: | Before having our prop dynamically balanced I would like to balance it
statically. After all it doesn't much make sense to make a dynamic
correction for a static condition that will change over time as the
prop is dressed for various reasons.
I found an article on EAA's site about balancing, but the apparatus
they used requires a hole through the prop hub, which we do not have.
Does anyone have any experience doing a static balance on a two blade
Hartzell prop? I would just take it into a prop shop to have it done,
but if it is simple I would like to check at each annual.
http://www.eaa.org/experimenter/articles/2009-11_howto_props.asp
Thoughts and tips appreciated.
Thanks, Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Wayne Elsner, Kyle Hokel, Tony Kolar, Jason Kreidler
N44YH - #40617 - Flying
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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dave.saylor.aircrafters(a
Guest
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| Posted: Tue Aug 02, 2011 5:50 am Post subject: Static Prop Balancing |
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Jason,
I've dynamically balanced lots of props and lots of helicopters but
never tried to do a static balance on a prop. You should see some
balance weights on the hub when you get the prop--those are from the
static balance after manufacture/overhaul. Don't change anything
until you're doing a dynamic balance.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Tue, Aug 2, 2011 at 5:32 AM, <jason.kreidler(at)regalbeloit.com> wrote:
| Quote: | Before having our prop dynamically balanced I would like to balance it
statically. After all it doesn't much make sense to make a dynamic
correction for a static condition that will change over time as the prop is
dressed for various reasons.
I found an article on EAA's site about balancing, but the apparatus they
used requires a hole through the prop hub, which we do not have. Does
anyone have any experience doing a static balance on a two blade Hartzell
prop? I would just take it into a prop shop to have it done, but if it is
simple I would like to check at each annual.
http://www.eaa.org/experimenter/articles/2009-11_howto_props.asp
Thoughts and tips appreciated.
Thanks, Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Wayne Elsner, Kyle Hokel, Tony Kolar, Jason Kreidler
N44YH - #40617 - Flying
|
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http://www.matronics.com/Navigator?RV10-List |
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jkreidler
Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI
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| Posted: Tue Aug 02, 2011 9:22 am Post subject: Re: Static Prop Balancing |
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You’re both correct; we do have weights in place from the factory static balance. We have on 325 hours and are going to get the prop dynamically balanced. Over the course of those 325 hours we have had to dress the prop from normal operation. So before I have the prop dynamically balanced I want to confirm that it is still statically balanced.
From reading the Experimenter article we are told that even coats of paint can affect the static balance of the prop, so it seems worthwhile to me to verify the static balance.
If I know the prop is statically balanced before having it dynamically balanced I will have a starting point for the future when it is necessary to dress the prop again. If it is not statically balance before having it dynamically balanced then we would need to have it dynamically rebalanced after dressing (not that it wouldn't be a good idea). Anyway, my point is to start with a known good static balance.
So, has anyone done this on a constant speed prop? The racing guys must....
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_________________
Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler
N44YH - Flying - #40617 |
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pitts_pilot(at)bellsouth.
Guest
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| Posted: Tue Aug 02, 2011 10:28 am Post subject: Static Prop Balancing |
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On 8/2/2011 1:22 PM, jkreidler wrote:
| Quote: |
You’re both correct; we do have weights in place from the factory static balance. We have on 325 hours and are going to get the prop dynamically balanced. Over the course of those 325 hours we have had to dress the prop from normal operation. So before I have the prop dynamically balanced I want to confirm that it is still statically balanced.
Static balance is akin to using a grenade to get rid of a fly. If you
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want to do that, it's your prop, but you've had good advice already that
it's gonna be a waste of time. If your prop is not close to balance, you
already feel the vibration a lot. Keep in min that engine/prop vibration
is very subjective. I lay a bowl of water on the glareshield to visibly
show how much vibration is present. If there isn't much, then I can save
my customer some bucks. Then I do the dynamic balance and repeat the
water thingy again. You can definitely see the difference. Some can feel
the difference, I can't.
| Quote: | > From reading the Experimenter article we are told that even coats of paint can affect the static balance of the prop, so it seems worthwhile to me to verify the static balance.
Affect it? Absolutely! However, the exercise is akin to aerodynamic
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cleanup to gain knots. Takes a lot for a little gain.
| Quote: | If I know the prop is statically balanced before having it dynamically balanced I will have a starting point for the future when it is necessary to dress the prop again. If it is not statically balance before having it dynamically balanced then we would need to have it dynamically rebalanced after dressing (not that it wouldn't be a good idea). Anyway, my point is to start with a known good static balance.
Doesn't make any difference. The dynamic balance will take care of any
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static unbalance and you won't even notice. Any change after the dynamic
balance (like a little dressing) will upset the apple cart once again.
| Quote: |
So, has anyone done this on a constant speed prop? The racing guys must....
Probably not .... they just do the dynamic balance with a whole lot of
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extra RPMs.
Linn .... balanced a few props
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