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arplnplt(at)gmail.com
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 Posted: Sun Aug 19, 2012 7:16 pm Post subject: Shudder/shimmy on landing |
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How many have NOT had any outside tire wear after 150 hours or so? I just flipped and re-balanced my tires and wheels after 166 hours. The outside of my tires were worn so I could not see the grooves.
I had the shimmy but now it is only when I let the nose wheel touch after landing. So I just re-balanced the nose wheel and will test tomorrow.
Dave leikam
On Aug 19, 2012, at 4:50 PM, Chris wrote:
[quote]
And the RV-14 has main gear with rectangular cross section...they finally listened.
-Chris
N919AR
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Mon Aug 20, 2012 6:26 am Post subject: Re: Shudder/shimmy on landing |
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I like to fly early. I taxied 90* to the morning sun and my nose wheel/pant started the fore-aft oscillation at 15-18 kts GS during phase 1. Since, I have flown with the family near gross wt and have very little shudder/shimmy. I flew up to a pancake breakfast with my 90 lb son/copilot Sat. I could feel an up and down motion from main gear. Hmmm...that's interesting. I know my Van's supplied tires are 5/16" out of round(no reason to balance an out of round tire), but never noticed it during first 25 hrs of testing. All I could think of was maybe I was riding more on the corners of the tires at low fuel/people loading and feeling scalloped tires. I have an entire set of Desser retreads/tubes to install at annual in November.
Van's first flight test in the -10 noted a shimmy. They said it was a brake disc .002" off...they knew about this since day one.
I believe we will always have problems with our round flexible, twistable gear legs, especially flying lightweight(which Sat was the first time in 50 hrs). So fly at gross and see if it makes a difference with yours. Note: I have reinforced/improved wheel pant mounting, matco nose wheel and orig unbalanced/out of round/crappy tires/tubes. At least they don't leak down!
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Wayne G. |
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taildragon(at)msn.com
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| Posted: Mon Aug 20, 2012 2:32 pm Post subject: Shudder/shimmy on landing |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> OK, lets summarize what people have said. There seem to be multiple "triggers" to cause the shudder/shimmy effect on landing. It could be mains and/or nose wheel: light toe in/out, brake disk "off", wheel pants "off", tires "off"...you can take your pick. The point is that the tapered main gear is too sensitive to a variety of "triggers". Lets make the tapered main gear less susceptible by changing the dynamic.
Steve T at steve(at)aircraftspecialty.com (steve(at)aircraftspecialty.com) has offered to make up stiffeners but needs to know would aluminum or wood work better? How long of a piece are we talking about?
I, for one, would like to give this a shot.
Roger "mine shudders, too" Standley
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Strasnuts
Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT
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| Posted: Mon Aug 20, 2012 3:45 pm Post subject: Shudder/shimmy on landing |
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Make it too stiff and it may transfer energy to places you don't want it.
Sent from my iPhone
On Aug 20, 2012, at 16:31, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
[quote] <?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> OK, lets summarize what people have said. There seem to be multiple "triggers" to cause the shudder/shimmy effect on landing. It could be mains and/or nose wheel: light toe in/out, brake disk "off", wheel pants "off", tires "off"...you can take your pick. The point is that the tapered main gear is too sensitive to a variety of "triggers". Lets make the tapered main gear less susceptible by changing the dynamic.
Steve T at steve(at)aircraftspecialty.com (steve(at)aircraftspecialty.com) has offered to make up stiffeners but needs to know would aluminum or wood work better? How long of a piece are we talking about?
I, for one, would like to give this a shot.
Roger "mine shudders, too" Standley
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40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours |
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taildragon(at)msn.com
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| Posted: Mon Aug 20, 2012 4:30 pm Post subject: Shudder/shimmy on landing |
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Seano,
Agreed, what size did you use?
Subject: Re: RV10-List: Re: Shudder/shimmy on landing
From: sean(at)braunandco.com
Date: Mon, 20 Aug 2012 17:41:23 -0600
To: rv10-list(at)matronics.com
Make it too stiff and it may transfer energy to places you don't want it.
Sent from my iPhone
On Aug 20, 2012, at 16:31, "Roger Standley" <[url=mailto:taildragon(at)msn.com]taildragon(at)msn.com[/url]> wrote:
[quote] OK, lets summarize what people have said. There seem to be multiple "triggers" to cause the shudder/shimmy effect on landing. It could be mains and/or nose wheel: light toe in/out, brake disk "off", wheel pants "off", tires "off"...you can take your pick. The point is that the tapered main gear is too sensitive to a variety of "triggers". Lets make the tapered main gear less susceptible by changing the dynamic.
Steve T at [url=mailto:steve(at)aircraftspecialty.com]steve(at)aircraftspecialty.com[/url] has offered to make up stiffeners but needs to know would aluminum or wood work better? How long of a piece are we talking about?
I, for one, would like to give this a shot.
Roger "mine shudders, too" Standley
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amekler
Joined: 07 Oct 2010
Posts: 164
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| Posted: Mon Aug 20, 2012 5:40 pm Post subject: Re: Shudder/shimmy on landing |
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will the RV-14 gear fit on the 10?
the wing is the same.
Alan
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TimRVator(at)comcast.net
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| Posted: Mon Aug 20, 2012 5:41 pm Post subject: Shudder/shimmy on landing |
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Attached is the email I got back from Van's on this topic.
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partner14
Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas
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| Posted: Mon Aug 20, 2012 6:22 pm Post subject: Shudder/shimmy on landing |
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Not sure about the gear, but the wing is NOT the same. The wing is a 10 wing, but it is 2 feet shorter. Aileron is the same, but the flaps are shorter. I would imagine that the attach point for the gear is not only engineered different, but would not adapt to the existing 10 mount point.
Don McDonald
From: amekler <amekler(at)metrocast.net>
To: rv10-list(at)matronics.com
Sent: Monday, August 20, 2012 8:40 PM
Subject: Re: Shudder/shimmy on landing
--> RV10-List message posted by: "amekler" <amekler(at)metrocast.net (amekler(at)metrocast.net)>
will the RV-14 gear fit on the 10?
the wing is the same.
Alan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=381430#38or?RV10-List" target="_blank">http://www.matronics.com/Navigator?RV10-Lis===
[quote][b]
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Don A. McDonald
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aircraftspecialty(at)gmai
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| Posted: Mon Aug 20, 2012 9:10 pm Post subject: Shudder/shimmy on landing |
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Does anyone have their fairings off at the moment?
If you do, and you have a free minute, please measure the diameter of the gear leg a few inches down from the fuselage. Then go 18" down the gear leg past the first point you measured and measure the next diameter there please. Those are the two measurements I'll need to make a prototype.
Thanks
Steve
P.S. Most people I have talked to believe this should be made of wood. If anyone has a differing opinion, let me know.
P.P.S. right now I still can't promise I'll make this available, but since it's an issue affecting a lot of folks I'll definitely give it a really good look. I just want to make sure that whatever I make is of good quality and will address the problem.
Take care
Steve
P.S. you can email the measurements to
steve(at)aircraftspecialty.com (steve(at)aircraftspecialty.com)
Sent from my iPhone
On Aug 20, 2012, at 15:31, "Roger Standley" <taildragon(at)msn.com (taildragon(at)msn.com)> wrote:
[quote] <?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> OK, lets summarize what people have said. There seem to be multiple "triggers" to cause the shudder/shimmy effect on landing. It could be mains and/or nose wheel: light toe in/out, brake disk "off", wheel pants "off", tires "off"...you can take your pick. The point is that the tapered main gear is too sensitive to a variety of "triggers". Lets make the tapered main gear less susceptible by changing the dynamic.
Steve T at steve(at)aircraftspecialty.com (steve(at)aircraftspecialty.com) has offered to make up stiffeners but needs to know would aluminum or wood work better? How long of a piece are we talking about?
I, for one, would like to give this a shot.
Roger "mine shudders, too" Standley
---
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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