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Prop-Balancing a TD

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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Sun Nov 18, 2012 8:30 am Post subject: Prop-Balancing a TD

Hi Gaggle:



A bit of an unusual question.

I have balanced props using dynamic balancing on planes, but, they were all trike gear.

Now I want to balance the prop on an RV6 (Tail Dragger).

 Since there is a nose up attitude and the prop is not sitting S&L, my thoughts are; asymmetric loading would affect the outcome.

And two things would happen:

1 - The prop would not reach the highest possible RPM and

 2 - I would be fighting the asymmetric loading and never be able to achieve a balance in the S&L configuration.

So, if I am correct about my concerns; how can I secure the plane in a S&L ground attitude?

 



Thanks Gaggle,

Barry

PS

I want to do this so bad because I just did a plane where I was able to reduce the displacement from 0.38 to 0.04 IPS

 WOW!  What a noticeable physical difference that made.

 

  [quote][b]

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sun Nov 18, 2012 9:25 am Post subject: Prop-Balancing a TD

Where aare you located? I'd love to have my prop  balanced, but I doubt there's anyone doing this within a few hundred miles of  me. (Central Colorado)

  

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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Sun Nov 18, 2012 1:56 pm Post subject: Prop-Balancing a TD

Hi John:



Well, I'm a bit further than a few hundred from you... All the way out in NJ.

Wish I was closer.

Barry



On Sun, Nov 18, 2012 at 12:25 PM, JohnF <n29cx(at)ridgeviewtel.us (n29cx(at)ridgeviewtel.us)> wrote:

 [quote]       Where are you located? I'd love to have my prop  balanced, but I doubt there's anyone doing this within a few hundred miles of  me. (Central Colorado)

  

 [quote]   ---

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Mon Nov 19, 2012 5:21 am Post subject: Re: Prop-Balancing a TD

The same technology used to dynamically balance an airplane propellor is used to balance helicopter rotors. It does not matter what the angle of the rotating disk is with respect to the earth's gravitational field. It is measuring the rotating mass imbalance with respect to its rotational center axis.

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Thom Riddle
Buffalo, NY (9G0)

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon Nov 19, 2012 6:24 am Post subject: Re: Prop-Balancing a TD

I'm with Thom,



I to balance props and have owned a helicopter. The angle won't make any difference. It is the rotating mass. You do not need full in flight rpm. I use 4800-5000 on the ground to balance. This depends on each persons prop rpm setup on their individual plane. The balancing instrument doesn't care because you just plug that number in and it gets divided by 2.43 any way because we have the gear reduction.

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Roger Lee
Tucson, Az.
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Light Sport Repairman
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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Mon Nov 19, 2012 6:33 am Post subject: Re: Prop-Balancing a TD

...I doubt there's anyone doing this within a few hundred miles of me. (Central Colorado) ....



Many active FBOs with repair stations offer dynamic prop balancing. They are getting more and more common as the price of equipment comes down. If I was doing mechanic work even half-time, I'd buy one but I'm still trying to be retired and only do actual work on other's airplanes once in a while.

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Thom Riddle
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