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  #1  
Old 09-29-2017, 06:07 AM
E. D. Eliot E. D. Eliot is offline
 
Join Date: Dec 2005
Location: San Pedro
Posts: 848
Default Balancing tire/hub assembly

Seeking to gain some some knowledge here. I have a new badly out of balance tire - never flown. Took the assembly out to Allen at Anti-Splat and he confirmed that I had the dot on the tire matched to the valve stem, etc. Allen said that he had never seen such an out of balance tire and that he couldn't balance it due to the very small side flanges on the Matco wheel assembly.

Brought the assembly home - took it apart and verified that I didn't have a bunched up/pinched tube, etc. Called Van's tech support and they wanted me to report the solution to them.

Suggestions please, as to what to do next? As they say, it's fun and education - not having too much fun with this one and need education. Thank you all.
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  #2  
Old 09-29-2017, 06:36 AM
JBPILOT JBPILOT is offline
 
Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,562
Default What I did - -

Glued weights where they will fit. A little messy, but works. I have a motorcycle wheel balancer. I also use a buffer with a wool pad to spin it up to actually see how well the static balance worked.
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  #3  
Old 09-29-2017, 06:46 AM
BigJohn BigJohn is offline
 
Join Date: Nov 2008
Location: Gloversville, NY
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Quote:
Originally Posted by JBPILOT View Post
Glued weights where they will fit. A little messy, but works. I have a motorcycle wheel balancer. I also use a buffer with a wool pad to spin it up to actually see how well the static balance worked.
I found out that apparently the glue on those weights deteriorates over time. At last CI I rotated tires, used the balancer device, carefully cleaned the wheel surfaces, and stuck the weights on. Sitting in my warm hangarr several fell off and got stuck between the tire and the wheel pants. Only cause I can think of is the weights had been laying around for a few years.
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  #4  
Old 09-29-2017, 06:53 AM
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tomkk tomkk is offline
 
Join Date: Apr 2014
Location: Port Orange, Fl
Posts: 677
Default

I used one of these https://www.harborfreight.com/motorc...and-98488.html with stick-on weights I got at the auto supply store. Worked great and felt no need to spin it up. If yours is so out of balance that Allan couldn't balance it, though, not sure the stick-ons will work.

If it's that bad it could be a defective tire or wheel. Did you try mounting it on the other wheel?
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  #5  
Old 09-29-2017, 07:00 AM
GWZ GWZ is offline
 
Join Date: May 2009
Location: Greenfield, IN
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I had similar concerns about those weights sticking. It looked to me like our small diameter wheels would only allow the adhesive to touch at each end of the weight. I put a bend in each weight so it would match the radius of the wheel. I ended up using a pipe nipple, a vee block and an arbor press to bend each weight. It was tough bending. I knew the weights wouldn't be lead anymore but didn't expect them to be steel.
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  #6  
Old 09-29-2017, 07:18 AM
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tomkk tomkk is offline
 
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Location: Port Orange, Fl
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Quote:
Originally Posted by GWZ View Post
I had similar concerns about those weights sticking. It looked to me like our small diameter wheels would only allow the adhesive to touch at each end of the weight. I put a bend in each weight so it would match the radius of the wheel. I ended up using a pipe nipple, a vee block and an arbor press to bend each weight. It was tough bending. I knew the weights wouldn't be lead anymore but didn't expect them to be steel.
I've actually had no problem with the weight sticking after several hundred TOs & landings. Cleaned the spot on the wheel well. IIRC, the weights had a thin foam backing that seemed to compensate for the wheel curvature fairly well. Centripetal force forces them outwards with wheel rotation.
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  #7  
Old 09-29-2017, 07:37 AM
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Piper J3 Piper J3 is online now
 
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Location: Hinckley, Ohio
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Possible the marked balance dot is incorrect from the mfg and might be 180 degree out of phase with heavy part of tire. This could explain why assembly can't be balanced by adding weights. Try disassembly and rotate tire on hub.

If you can find a fixture, try checking balance of tire all by itself to confirm tire irregularity.
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  #8  
Old 09-29-2017, 10:21 AM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
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I'm with Tom and GWZ on this. Main wheel weights easily and securely stick onto the hub's inner surface once you have given the weights a slight curve. The nose wheel is a bit more problematic in that you have to place the weights inside of the hub while avoiding the hub's internal structural ribs. The tire balance weights I use are about the size of a small postage stamp (2-4 weights may be required per wheel). Let centripetal forces be your friend!
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  #9  
Old 09-29-2017, 10:54 AM
JBPILOT JBPILOT is offline
 
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Location: Jesup, Iowa
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Default I should have added - -

I glue them on even though they are self adhesive. Takes more to get them off, but they stay in place. 3M Trim adhesive works well.
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  #10  
Old 09-29-2017, 11:32 AM
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Bob Martin Bob Martin is offline
 
Join Date: Jan 2005
Location: Richmond, Virginia
Posts: 1,004
Default New Tire

Take the tire back to where you purchased it. Seems it is not normal. I too had Allen do a set of tires and wheels and Allen remarked about how many weights the Flight Custom III's took to balance. I have contacted Desser about this issue in the past, several years ago, because I have seen weights installed on the inside of tires, almost looking like a patch. I was told it was a weight used in extreme out of balance tires. Turns out it is not easily purchased in a google search but the tire guys know about it and purchase them in bulk. As you can imagine this can get pretty complicated and time consuming taping a weight on the outside of the tire radius to find the amount of weight needed, etc.....
So, if you can...return the tire for another one. Assuming you can't balance it by rotating the red dot around and normal stickon weights.
Just my 2 cents
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