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Prop Balance

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jeff(at)rmmm.net
Guest

Posted: Wed Apr 27, 2011 4:28 pm Post subject: Prop Balance

HI All,

I'm going back to my original warp drive 3 blade prop in hopes of it being smother running. As well I need to go back to the original fiberglass spinner and backplate. I have a fellow willing to fly here to do a harmonic balance of the prop but has shown concern of attaching the needed weights to the fiberglass back plat / spinner. Just curious to what others have done and how they have attached any weights needed.

Thanks in advance,



Jeff R.



N128LJ Gold Rush

P.S. Lets not forget the Rough River fly-in this years is on Labor Day weekend. It could be time to get fired up again.

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rehn(at)rockisland.com
Guest

Posted: Wed Apr 27, 2011 6:04 pm Post subject: Prop Balance

Jeff

I had mine balanced and the weight was attached to the back plate, seemed routine to me. I can take a photo for you if you like. My spinner is aluminum, seems I heard they where preferred for some reason? Might check that out as well.

Jerry

Mono 914



Sent from my iPad



On Apr 27, 2011, at 5:23 PM, Jeffrey Roberts <jeff(at)rmmm.net> wrote:



 	  Quote: 	
		   

 

 HI All,

 I'm going back to my original warp drive 3 blade prop in hopes of it being smother running. As well I need to go back to the original fiberglass spinner and backplate. I have a fellow willing to fly here to do a harmonic balance of the prop but has shown concern of attaching the needed weights to the fiberglass back plat / spinner. Just curious to what others have done and how they have attached any weights needed.

 E


	




 	  Quote: 	
		   Thanks in advance,

 

 Jeff R.

 

 N128LJ Gold Rush

 

 

 P.S. Lets not forget the Rough River fly-in this years is on Labor Day weekend. It could be time to get fired up again.

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neveyre(at)aol.co.uk
Guest

Posted: Wed Apr 27, 2011 10:11 pm Post subject: Prop Balance

Hi Jeff,

   AN970 washers with AN3 bolts as needed, in the rear face of the backplate.

   Ident the backplate, prop and spinner so it goes back on in the same place if you take it off anytime.

   Cheers,

   Nev.

 

 

   

 

 

   --

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pete(at)lawless.info
Guest

Posted: Wed Apr 27, 2011 11:12 pm Post subject: Prop Balance

Hi Jeff



Just drill a hole though the back plate and bolt on the penny washers so

they are located inside the spinner.



Pete



--

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lamprey(at)infocom.co.ug
Guest

Posted: Fri Apr 29, 2011 12:37 am Post subject: Prop Balance

Jeff,

  

 Let the spinner float in a tank of water, rotate  it, see which side gravitates down, then compensate on the other side with a  weight of some kind (eg washer) glued or glassed into the inside.  Spin  again, if it spins without bias, its balanced, hey presto.

  

 Richard

 Europa 168, 5Y-LRY,  Kenya

   [quote][b]

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fklein(at)orcasonline.com
Guest

Posted: Fri Apr 29, 2011 9:49 am Post subject: Prop Balance

On Apr 29, 2011, at 12:27 AM, Richard Lamprey wrote:

 	  Quote: 	
		  Let the spinner float in a tank of water, rotate it, see which side gravitates down, then compensate on the other side with a weight of some kind (eg washer) glued or glassed into the inside.  Spin again, if it spins without bias, its balanced, hey presto.

	




Richard...excellent..straightforward and simple...

Why am I thinking you must be a technical consultant for the Harry Potter films? ))

Cheers,

Fred

do not archive





 [quote][b]

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lamprey(at)infocom.co.ug
Guest

Posted: Sat Apr 30, 2011 7:21 pm Post subject: Prop Balance

Jeff, you are very welcome.  I cant say that I  can claim the credit for this, I read about it somewhere many years ago.   It is the fibre-'seam' in the spinner that seems to cause most the inbalance, so  the counter-weight will lie somewhere opposite from this.  Of course it is  quite challenging to get the spinner to float or lie in the water (with its  holes), but a good idea can be had about the imbalance, and a lot cheaper and  more convenient than dynamic balancing.

  

 All best

 Richard

 Kenya

     [quote][b]

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