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05-14-2009, 09:34 AM
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Join Date: Jun 2005
Location: C09 - Morris
Posts: 579
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Has anyone tried Dyna Beads in their tires?
http://www.innovativebalancing.com/
Has anyone tried Dyna Beads in their tires to balance them, maybe reduce nose wheel bounce?
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(This post by: Christopher Checca EAA Lifetime Member #799388)
Allen Checca (father)
Christopher Checca (son)
RV-6A - N468AC
ENGINE: Lycoming 180 HP O-360-A1A
PROPELLER: Senisentch 72FM859-1-85
WEIGHT: Empty Aircraft 1152 lbs
BASED: KC09 - Morris, IL.
Flying since June 6, 2005
N468AC Web Site
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05-14-2009, 10:06 AM
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Join Date: Jan 2005
Location: Las Vegas, NV
Posts: 488
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In my other RV
(38' diesel), they put balancing sand in the tires at the last tire change. I would NOT recommend it or similar products for our flying RVs.
Two issues - first, the sand all ends up at the bottom of the tire while the vehicle sits (or probably when flying). Typically, I feel more vibration than without the sand for the first few miles. Later it gets better, but not sure it's really helping. Our flying RVs would likely see this initial imbalance on landing, arguably the worst time to be out of balance.
Second - the sand gets in your tire gauge and screws up the back flow valve (and maybe the tire stem valve too). They are supposed to install a sintered metal filter below the tire valve, but I'm not sure whether my installer left them out, or whether they are just ineffective...
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Terry F.
RV 7A N457RV
250 hours and lovin it! 
Southern Nevada EAA Chapter 1300 - www.eaa1300.org
Paid VAF 03/17
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05-14-2009, 10:30 AM
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Join Date: Jul 2007
Location: Keller, TX
Posts: 1,553
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I looked at the "how it works" page and was wondering how the beads stay in place when there is no centripedal force, i.e. when the tire is not rotation. frazital answered that one - they don't!
Doesn't sound like a good idea. At first they are going to make things mroe off-balance until the distribute.
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RV-8 180 hp IO-360 N247TD with 10" SkyView!
VAF Donations Made 8/2019 and 12/2019
"Cum omni alio deficiente, ludere mortuis."
(When all else fails, play dead.)
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05-24-2009, 02:13 PM
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Join Date: Mar 2007
Location: Cambridge MA
Posts: 131
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The beads won't bother an air gauge (they don't really get suspended in the air), but they also rely on centrifugal force to hold them in place. They work pretty well on cars, RV's and motorcycles. I'm not sure how they would be on an airplane. The tire wouldn't be balanced when it first contacted the runway, but I am unsure whether it would balance out so quickly as to work well or if it would take too long.
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Student pilot and RV wanna-be
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10-14-2010, 08:39 PM
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Join Date: Oct 2006
Location: Seattle, wa
Posts: 679
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Nice responses from those who have never tried them in a RV.
Here is a response from someone who has tried them:
Gear leg shimmy while slowing....... gone
1/2 oz each tire
30 psi
in a -4
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10-15-2010, 02:14 PM
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Join Date: Oct 2009
Location: Fort Myers
Posts: 370
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I've got a Goldwing and there are lots of guys on that forum that swear by them. Overall a lot of positive reviews and the only bad thing generally said is that they did not notice any improvement. (no harm-no foul). I agree with bikepilot though inasmuch as we don't have a general speeding up and slowing down (as in terrestrial vehicles) which allows the beads to centrifugally spread out. It's zero to 60 in .2 seconds and they'd all be sitting in one spot. Sounds like it might contribute to shimmy initiation.
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10-15-2010, 04:12 PM
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Join Date: Oct 2006
Location: Seattle, wa
Posts: 679
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Quote:
Originally Posted by Flybuddy2
It's zero to 60 in .2 seconds and they'd all be sitting in one spot. Sounds like it might contribute to shimmy initiation.
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I flew with Mike Seager in the -7 trainer.... He said the leg shimmy on decel was normal, nothing you could do but try to transit the speed and get out of it. Had it in the -4 but not bad. Added dyna beads and all shimmy went away. No adverse effects.
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10-15-2010, 06:47 PM
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Join Date: Oct 2009
Location: Fort Myers
Posts: 370
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Quote:
Originally Posted by asav8tor
I flew with Mike Seager in the -7 trainer.... He said the leg shimmy on decel was normal, nothing you could do but try to transit the speed and get out of it. Had it in the -4 but not bad. Added dyna beads and all shimmy went away. No adverse effects.
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Cool...actual experience trumps educated guesses.
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10-16-2010, 06:58 PM
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Join Date: Dec 2006
Location: Belleville
Posts: 306
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49clipper
So, if it is simply a balance issue, why not just balance the tire and rim combination and solve the problem?
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10-16-2010, 11:34 PM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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I am running 375/65/16 Mickey Thomson my dodge, 10 oz. of anti freeze in each tire, no wheel weights, no vibration.
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