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prop balancing

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dashwood

Joined: 24 Jan 2009
Posts: 73
Location: sw ontario canada

Posted: Thu Aug 05, 2010 4:46 am Post subject: prop balancing

I have been searching the posts for " reasons for early gearbox failures" i have some small nicks in my prop(warp ) and know it has never been balanced. i do not feel any vibrations but am not sure what a smooth run wood feel like either. what is the detailed procedure for balancing. what is the balance tool i am hearing about. i have a three blade prop so the balancer would most likely be a pinpoint on the bench???? i have never had the prop off so . how would one find the exact center to start from.

_________________
Ross Alexander: CH701 driver 912ul 788tt
It only takes two things to fly, airspeed and money

Roger Lee

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

Posted: Thu Aug 05, 2010 4:57 am Post subject: Re: prop balancing

PostPosted: Mon Aug 02, 2010 9:41 am    Post subject: Re: Prop balancer 	Reply with quote Edit/Delete this post Delete this post

Hi Dick,



Here is the website to get a wheel / prop balancer. Roughly $115.



I would call him. You need to ask for a model DU42 with the 14" shaft.

714-842-9210

Marc Parnes will most likely answer the phone

http://www.marcparnes.com/Universal_Motorcycle_Wheel_Balancer.htm

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Thu Aug 05, 2010 7:56 am Post subject: prop balancing

Okay, I cheated, I'm a machinist as well as an LSARM so I turned some hubs to fit the prop center and used a long dowel pin to center the prop. My friend's balance uses two pieces of 3/4" band saw blade as the balancing runners with level adusters on three points. It cost his dad about $5 to make with some junk box parts and a little plywood. Easy to adjust until it was dead flat on the runners and I turned the prop to put the balance between blades 1 and 2, 2 and 3, and then 3 and 1, adding tape squares to the blades until there was no movement of the vertical blade no matter how I placed the prop on the runners.  Simple to do, took less than an hour to find what I had to do to get in balance, hard to explain and unfortunately I didn't take any pictures.

Rick



On Thu, Aug 5, 2010 at 7:46 AM, dashwood <dashwoodlock(at)hotmail.com (dashwoodlock(at)hotmail.com)> wrote:

 [quote]--> RotaxEngines-List message posted by: "dashwood" <dashwoodlock(at)hotmail.com (dashwoodlock(at)hotmail.com)>

  

 I have been searching the posts for " reasons for early gearbox failures" i have some small nicks in my prop(warp ) and know it has never been balanced. i do not feel any vibrations but am not sure what a smooth run wood feel like either. what is the detailed procedure for balancing. what is the balance tool i am hearing about. i have a three blade prop so the balancer would most likely be a pinpoint on the bench???? i have never had the prop off so . how would one find the exact center to start from.

  

 --------

 Ross Aalexander: CH701 driver 912ul 398tt

 

 

 

 

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George Myers

Joined: 10 Jan 2006
Posts: 76
Location: San Marcos, Texas

Posted: Thu Aug 05, 2010 12:15 pm Post subject: prop balancing

--

George Myers

Joined: 10 Jan 2006
Posts: 76
Location: San Marcos, Texas

Posted: Thu Aug 05, 2010 12:45 pm Post subject: prop balancing

--

craig(at)craigandjean.com
Guest

Posted: Thu Aug 05, 2010 1:02 pm Post subject: prop balancing

BTW: you can build your own dynamic balancer for relatively little money.

The biggest expense (if you don't have one) is a digital storage

oscilloscope. This is how Gary Ray balanced the prop on his Corvair-powered

Zenith 601XL:



http://picasaweb.google.com/Papawobo/DynamicBalancing#

Dick Maddux

Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl

Posted: Fri Aug 06, 2010 4:21 am Post subject: prop balancing

Roger

  I ordered the balancer from Mark and should have it Monday. Thanks for the info !

                                                    Dick Maddux

                                                    912UL

                                                    Milton,Fl

 PS : am installing a Kiev on another paradise today wish I had the balancer BUT, they are usually spot on. (or close)

  [quote][b]

Roger Lee

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

Posted: Fri Aug 06, 2010 5:22 am Post subject: Re: prop balancing

Hi Dick,



I think it should work out fairly well for you. It does a good job on wheels and props. The hardest thing to do for any balancer is to get very high quality bearings if your balancer uses them. Some people just take a rod and put it on the edge of two pieces of metal setting on end with sharpened edges like a knife to make it more sensitive. This balancer that you bought has served me well for 3 years and the price was right to have something that was easy, cost effective and reliable.

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Fri Aug 06, 2010 5:43 am Post subject: prop balancing

Roger,



In all this discussion about balancing props, including the hub and bolts, 

and the supposed Rotax prop out-of-balance tolerance of 0.5 gram no one has 

mentioned the spinner. The spinner rotates with the prop. How do you balance 

a spinner to within 0.5 grams? Spinners can be out easily that much. You 

certainly can't on the Universal Motorcycle Wheel Balancer you recommended.



Hugh McKay



--------------------------------------------------

From: "Roger Lee" <ssadiver1(at)yahoo.com>

Sent: Friday, August 06, 2010 9:22 AM

To: <rotaxengines-list(at)matronics.com>

Subject: Re: prop balancing



 	  Quote: 	
		   



 Hi Dick,



 I think it should work out fairly well for you. It does a good job on 

 wheels and props. The hardest thing to do for any balancer is to get very 

 high quality bearings if your balancer uses them. Some people just take a 

 rod and put it on the edge of two pieces of metal setting on end with 

 sharpened edges like a knife to make it more sensitive. This balancer that 

 you bought has served me well for 3 years and the price was right to have 

 something that was easy, cost effective and reliable.



 --------

 Roger Lee

 Tucson, Az.

 Light Sport Repairman - Maintenance Rated

 Rotax Repair Center

 520-574-1080





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=307765#307765

kjburns(at)btinternet.com
Guest

Posted: Fri Aug 06, 2010 7:04 am Post subject: prop balancing

Dynamic prop balancer-see below $1500 seems steep, form a group to buy one, and 

book it out, cheaper than wrecking an Prop /Hub/Crank combination



http://www.rpxtech.com/rpxweb/Dynavibe.asp



Kevin



---

flyadive(at)gmail.com
Guest

Posted: Fri Aug 06, 2010 8:38 am Post subject: prop balancing

Gaggle:

  

 At work I do a lot of vibration and shock testing.  The company is considering a dynamic balancer with computer.

  

 Now that there have been a few that have done the static balancing - Has any one done a comparison is results between the static and dynamic?  

 What kinds of improvements have you noted?

  

 Barry

 On Fri, Aug 6, 2010 at 9:22 AM, Roger Lee <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)> wrote:

 [quote]--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)>

 

Hi Dick,



I think it should work out fairly well for you. It does a good job on wheels and props. The hardest thing to do for any balancer is to get very high quality bearings if your balancer uses them. Some people just take a rod and put it on the edge of two pieces of metal setting on end with sharpened edges like a knife to make it more sensitive. This balancer that you bought has served me well for 3 years and the price was right to have something that was easy, cost effective and reliable.

 

--------

Roger Lee

Tucson, Az.

Light Sport Repairman - Maintenance Rated

Rotax Repair Center

520-574-1080





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=307765#307765

 h as List Un/Subscription,

 www.matronics.com/Navigator?RotaxEngines-List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List

 ronics.com/" target="_blank">http://forums.matronics.com

 Matt Dralle, List Admin.

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[b]

Roger Lee

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

Posted: Fri Aug 06, 2010 5:15 pm Post subject: Re: prop balancing

I have a dynamic balancer and yes it can make a big difference, but not all props are out as much as another. Some get a little correction while others get more. there are others things at play sometimes after the static and after it's back on the engine. Usual cost is any where from $250-$350 for a dynamic balance. A dynamic balancer's cost is around $4k and up.

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

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