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bruce1hwjohnson(at)yahoo.
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 Posted: Fri Feb 15, 2013 12:25 pm Post subject: Gear leg stiffeners |
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Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
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flying-nut(at)cfl.rr.com
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| Posted: Fri Feb 15, 2013 12:34 pm Post subject: Gear leg stiffeners |
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You might have nosegear shimmy ..... easy for someone on the ground to see. If so, just tighten up the nose fork nut so that a spring scale reads 25-30 Lbs when pulled at the axle. You may need to add Belleville washers for more dampening. The washers 'wear in' a little after initial tightening.
Linn
On 2/15/2013 3:24 PM, Bruce Johnson wrote:
[quote] Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
No virus found in this message.
Checked by AVG - www.avg.com
02/15/13 [b]
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bruce1hwjohnson(at)yahoo.
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| Posted: Fri Feb 15, 2013 1:05 pm Post subject: Gear leg stiffeners |
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I'll double check, but it sure felt like it was the mains. Like I said never happened before
From: Linn <flying-nut(at)cfl.rr.com>
To: rv10-list(at)matronics.com
Sent: Friday, February 15, 2013 1:33 PM
Subject: Re: Gear leg stiffeners
You might have nosegear shimmy ..... easy for someone on the ground to see. If so, just tighten up the nose fork nut so that a spring scale reads 25-30 Lbs when pulled at the axle. You may need to add Belleville washers for more dampening. The washers 'wear in' a little after initial tightening.
Linn
On 2/15/2013 3:24 PM, Bruce Johnson wrote:
[quote] Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
No virus found in this message.
Checked by AVG - www.avg.com
02/15/13
[b]
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carl.froehlich(at)verizon
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| Posted: Fri Feb 15, 2013 1:06 pm Post subject: Gear leg stiffeners |
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Yep – at 65 hours now and just did the third nose gear fork nut tighten. On my 8A this eventually stabilized out so I just check it at each annual.
Carl
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Linn
Sent: Friday, February 15, 2013 3:33 PM
To: rv10-list(at)matronics.com
Subject: Re: Gear leg stiffeners
You might have nosegear shimmy ..... easy for someone on the ground to see. If so, just tighten up the nose fork nut so that a spring scale reads 25-30 Lbs when pulled at the axle. You may need to add Belleville washers for more dampening. The washers 'wear in' a little after initial tightening.
Linn
On 2/15/2013 3:24 PM, Bruce Johnson wrote:
| Quote: |
Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
No virus found in this message.
Checked by AVG - www.avg.com
02/15/13 |
http://forums.matronics.com[/url] - List Contribution Web generous nbsp; -Matt Dralle, List href="http://www.matronics.com/contribution">http://www.matronics.com/c=[/b] [/quote]
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rv10flyer(at)live.com
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| Posted: Fri Feb 15, 2013 1:13 pm Post subject: Gear leg stiffeners |
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Bruce;
I just had the same situation last week. I added some air to the front tire and verified the torque was right on the fork nut, but for some reason the plane shakes at a certain speed when I taxi now. I thought it was the taxiway, but than it occurred to me that I have been over the same taxiway in the past without an issue, so I don’t know why it does it now, no issue on takeoff or landing, only when I do a taxi at a job pace.
From: Bruce Johnson (bruce1hwjohnson(at)yahoo.com)
Sent: Friday, February 15, 2013 1:04 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Gear leg stiffeners
I'll double check, but it sure felt like it was the mains. Like I said never happened before
From: Linn <flying-nut(at)cfl.rr.com>
To: rv10-list(at)matronics.com
Sent: Friday, February 15, 2013 1:33 PM
Subject: Re: Gear leg stiffeners
You might have nosegear shimmy .... easy for someone on the ground to see. If so, just tighten up the nose fork nut so that a spring scale reads 25-30 Lbs when pulled at the axle. You may need to add Belleville washers for more dampening. The washers 'wear in' a little after initial tightening.
Linn
On 2/15/2013 3:24 PM, Bruce Johnson wrote:
| Quote: | Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
No virus found in this message.
Checked by AVG - www.avg.com
02/15/13
< font>
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href="http://forums.matronics.com">http://forums.matronics.com
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flying-nut(at)cfl.rr.com
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| Posted: Fri Feb 15, 2013 1:32 pm Post subject: Gear leg stiffeners |
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If you have nose gear shimmy and add air over your normal pressure, you're setting yourself up for tire wear in the center treads.Â
When I was a baby pilot my mentor said to air up the tire so the outside tread just lifts off the pavement. You don't have to measure the pressure. It stands to reason that one tire pressure won't fit a plane that weighs lots Vs. one that weighs little. This filling method has worked for me.Â
If you have a problem with vibration on the ground, get an observer to watch and see what's going on. Mains can have tracking problems, nose can shimmy and both will suffer from out-of-balance conditions. You really can't tell what's out of whack because both nose and mains transmit their vibration to the fuselage .... and then to your butt.
Linn
On 2/15/2013 4:13 PM, Pascal wrote:
[quote] Bruce;
I just had the same situation last week. I added some air to the front tire and verified the torque was right on the fork nut, but for some reason the plane shakes at a certain speed when I taxi now. I thought it was the taxiway, but than it occurred to me that I have been over the same taxiway in the past without an issue, so I don’t know why it does it now, no issue on takeoff or landing, only when I do a taxi at a job pace.
Â
Â
From: Bruce Johnson (bruce1hwjohnson(at)yahoo.com)
Sent: Friday, February 15, 2013 1:04 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Gear leg stiffeners
Â
I'll double check, but it sure felt like it was the mains. Like I said never happened before
Â
From: Linn <flying-nut(at)cfl.rr.com> (flying-nut(at)cfl.rr.com)
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Sent: Friday, February 15, 2013 1:33 PM
Subject: Re: Gear leg stiffeners
Â
You might have nosegear shimmy ..... easy for someone on the ground to see. If so, just tighten up the nose fork nut so that a spring scale reads 25-30 Lbs when pulled at the axle. You may need to add Belleville washers for more dampening. The washers 'wear in' a little after initial tightening.
Linn
On 2/15/2013 3:24 PM, Bruce Johnson wrote:
| Quote: | Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
No virus found in this message.
Checked by AVG - www.avg.com
02/15/13
< font> |
No virus found in this message.
Checked by AVG - www.avg.com
02/15/13 [b]
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bruce1hwjohnson(at)yahoo.
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| Posted: Fri Feb 15, 2013 1:33 pm Post subject: Gear leg stiffeners |
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Mine is about 45 mph on take off and landing, taxi is fine. And it shakes, I almost aborted my take off this morning. When I first started flying it I had heard about the slow leaks of the Van's tire and tried putting slime in them, that was fun. About 35 to 50 it gave a very interesting ride, needless to say taking the slime out was way harder than putting it in. Lesson learned
From: Pascal <rv10flyer(at)live.com>
To: rv10-list(at)matronics.com
Sent: Friday, February 15, 2013 2:13 PM
Subject: Re: Gear leg stiffeners
Bruce;
I just had the same situation last week. I added some air to the front tire and verified the torque was right on the fork nut, but for some reason the plane shakes at a certain speed when I taxi now. I thought it was the taxiway, but than it occurred to me that I have been over the same taxiway in the past without an issue, so I don’t know why it does it now, no issue on takeoff or landing, only when I do a taxi at a job pace.
From: Bruce Johnson (bruce1hwjohnson(at)yahoo.com)
Sent: Friday, February 15, 2013 1:04 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Gear leg stiffeners
I'll double check, but it sure felt like it was the mains. Like I said never happened before
From: Linn <flying-nut(at)cfl.rr.com>
To: rv10-list(at)matronics.com
Sent: Friday, February 15, 2013 1:33 PM
Subject: Re: RV10-List: Gear leg stiffeners
You might have nosegear shimmy ..... easy for someone on the ground to see. If so, just tighten up the nose fork nut so that a spring scale reads 25-30 Lbs when pulled at the axle. You may need to add Belleville washers for more dampening. The washers 'wear in' a little after initial tightening.
Linn
On 2/15/2013 3:24 PM, Bruce Johnson wrote:
| Quote: | Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
No virus found in this message.
Checked by AVG - www.avg.com
02/15/13
< font> |
[quote]
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
http://www.matronics.com/Navi="_blank" href="http://forums.matronics.com/">http://forums.matronics.c-> [/b][b]
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jfrjr(at)roadrunner.com
Guest
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| Posted: Fri Feb 15, 2013 1:35 pm Post subject: Gear leg stiffeners |
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Bruce: Make sure it's not the nose wheel. I have 360 hours and roughly every 100 hours I get a hard shimmy. And each time the lateral torgue on the nose wheel castor had dropped to about 10lbs. Increasing it back to the required 25lbs cured the shimmy completely. Jay Rowe
Sent from my iPhone
On Feb 15, 2013, at 12:24 PM, Bruce Johnson <bruce1hwjohnson(at)yahoo.com (bruce1hwjohnson(at)yahoo.com)> wrote:
[quote]Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
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Lew Gallagher
Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC
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| Posted: Fri Feb 15, 2013 4:53 pm Post subject: Re: Gear leg stiffeners |
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Hey RV10flyer,
Another thought on your slow taxi shake ... have you checked to see if one of your brake pads is dragging? Warped rotor? Flat spot on tire (landed with brake on)? I found that sometimes the right brake pedal on the co-pilot's side wasn't totally releasing, causing that brake to drag (others have solved this with springs or re-drilling the brake pedal hinge rod holes to free it up). To test, you have to jack it up and spin it by hand. It just takes a tiny bit of the pedal not returning to cause this since there is a release bypass in the last bit of piston travel.
Later, - Lew
[quote="rv10flyer(at)live.com"]Bruce;
I just had the same situation last week. I added some air to the front tire and verified the torque was right on the fork nut, but for some reason the plane shakes at a certain speed when I taxi now. I thought it was the taxiway, but than it occurred to me that I have been over the same taxiway in the past without an issue, so I don’t know why it does it now, no issue on takeoff or landing, only when I do a taxi at a job pace.
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http://www.matronics.com/Navigator?RV10-List |
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_________________
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Fri Feb 15, 2013 9:57 pm Post subject: Re: Gear leg stiffeners |
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Occasionally I get a nose wheel fore-aft shimmy around 15 kts GS. If my plane sits in one place more than 10 days, Van's tires get flat spots which can induce resonance in the round gear legs. I know my tires are out of round by 1/4" and have Desser retreads in stock when I get a few more hours on these.
Fly more.
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Wayne G. |
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partner14
Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas
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| Posted: Sat Feb 16, 2013 5:20 am Post subject: Gear leg stiffeners |
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Bruce, it's not Van's tire, it's the tubes. Spend the bucks and get Leak Stop tubes.
Don McDonald
--- On Fri, 2/15/13, Bruce Johnson <bruce1hwjohnson(at)yahoo.com> wrote:
| Quote: |
From: Bruce Johnson <bruce1hwjohnson(at)yahoo.com>
Subject: Re: Gear leg stiffeners
To: "rv10-list(at)matronics.com" <rv10-list(at)matronics.com>
Date: Friday, February 15, 2013, 3:33 PM
Mine is about 45 mph on take off and landing, taxi is fine. And it shakes, I almost aborted my take off this morning. When I first started flying it I had heard about the slow leaks of the Van's tire and tried putting slime in them, that was fun. About 35 to 50 it gave a very interesting ride, needless to say taking the slime out was way harder than putting it in. Lesson learned
From: Pascal <rv10flyer(at)live.com>
To: rv10-list(at)matronics.com
Sent: Friday, February 15, 2013 2:13 PM
Subject: Re: Gear leg stiffeners
Bruce;
I just had the same situation last week. I added some air to the front tire and verified the torque was right on the fork nut, but for some reason the plane shakes at a certain speed when I taxi now. I thought it was the taxiway, but than it occurred to me that I have been over the same taxiway in the past without an issue, so I don’t know why it does it now, no issue on takeoff or landing, only when I do a taxi at a job pace.
From: [url=/mc/compose?to=bruce1hwjohnson(at)yahoo.com]Bruce Johnson[/url]
Sent: Friday, February 15, 2013 1:04 PM
To: [url=/mc/compose?to=rv10-list(at)matronics.com]rv10-list(at)matronics.com[/url]
Subject: Re: Gear leg stiffeners
I'll double check, but it sure felt like it was the mains. Like I said never happened before
From: Linn <flying-nut(at)cfl.rr.com>
To: rv10-list(at)matronics.com
Sent: Friday, February 15, 2013 1:33 PM
Subject: Re: Gear leg stiffeners
You might have nosegear shimmy .... easy for someone on the ground to see. If so, just tighten up the nose fork nut so that a spring scale reads 25-30 Lbs when pulled at the axle. You may need to add Belleville washers for more dampening. The washers 'wear in' a little after initial tightening.
Linn
On 2/15/2013 3:24 PM, Bruce Johnson wrote:
| Quote: | Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
No virus found in this message.
Checked by AVG - www.avg.com
02/15/13
< font> |
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Don A. McDonald
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rv10flyer(at)live.com
Guest
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| Posted: Sat Feb 16, 2013 6:35 am Post subject: Gear leg stiffeners |
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sounds like the situation I was in, hadn't flown in weeks. and it was about
15 kts when it started.
I guess I need to go taxi around and get it all rounded out again!
Thanks for the feedback!
--
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TimRVator(at)comcast.net
Guest
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| Posted: Mon Feb 18, 2013 6:30 am Post subject: Gear leg stiffeners |
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Photos of shimmy damper fabrication and installation attached. I made
mine out of Fir, attached with strapping tape for now.
They made a huge improvement in landing roll out shimmy. Wheel
balancing did little to no good. Tire pressure at 39psi seems to be a
sweet spot on my plane.
Tim
--
Tim Lewis -- HEF (Manassas, VA)
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 350 hrs
Bruce Johnson said the following on 2/15/2013 3:24 PM:
| Quote: | Does anybody have a picture handy of the wood stiffeners I have heard
about?? I have got 87 hrs on 151BJ and have never had a problem until
today. Full fuel, two 200lb guys and wow what a shake. I dropped my
passenger and still had a shake and then landed without one. Took off
again and it was just a minute shake, landed with none. Weird after
all these take offs and landings for it to start now. I am going to
pull the fairings off and check for other things, but while I am at it
I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
|
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Jim Combs
Joined: 24 Jan 2010
Posts: 141
Location: Lexington, Ky
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| Posted: Mon Feb 18, 2013 6:50 am Post subject: Gear leg stiffeners |
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How did you attach the fir damper to the landing gear leg?
Jim Combs (N312F Flying - And painted)
Do Not Archive
On Mon, Feb 18, 2013 at 9:29 AM, Tim Lewis <TimRVator(at)comcast.net (TimRVator(at)comcast.net)> wrote:
[quote]Photos of shimmy damper fabrication and installation attached. I made mine out of Fir, attached with strapping tape for now.
They made a huge improvement in landing roll out shimmy. Wheel balancing did little to no good. Tire pressure at 39psi seems to be a sweet spot on my plane.
Tim
--
Tim Lewis -- HEF (Manassas, VA)
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 350 hrs
Bruce Johnson said the following on 2/15/2013 3:24 PM:
| Quote: | Does anybody have a picture handy of the wood stiffeners I have heard about?? I have got 87 hrs on 151BJ and have never had a problem until today. Full fuel, two 200lb guys and wow what a shake. I dropped my passenger and still had a shake and then landed without one. Took off again and it was just a minute shake, landed with none. Weird after all these take offs and landings for it to start now. I am going to pull the fairings off and check for other things, but while I am at it I might put the stiffeners on. Thanks in advance
Do not archive
Bruce Johnson
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[b]
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_________________
RV-10 -> N312F - Flying as of 12/2008 |
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rv10flyer(at)live.com
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| Posted: Mon Feb 18, 2013 7:56 am Post subject: Gear leg stiffeners |
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Tim;
Very nice setup. Do you, by any chance, have the dimensions? (width, length,
Height, size of the oval for the gear leg (how deep to fit)) I know little
about woodworking, except the pine wood derby I once built, but I'll play
around with this if I know what I 'm aiming for in my garage.
Thx
--
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TimRVator(at)comcast.net
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| Posted: Mon Feb 18, 2013 5:05 pm Post subject: Gear leg stiffeners |
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Attached is the RV-6 plans section on shimmy dampers for reference, and
a page of notes that I used in making my RV-10 dampers.
As I recall, here was my process for making a single shimmy damper:
- Start with 1"x2.5" fir, cut to the 12-13 degree angle depicted on my
drawing (two pieces, mirror image). Plan to end up with pieces 22" long.
- Mark a line on the leading edge that will result in the damper half
being 3/4" wide at the top, and about 1/2" wide at the bottom (my
drawing says 11/32", I think that's incorrect).
- With the band saw table tilted 30 degrees, cut along that line, such
that you have fabricated the leading edge of the shimmy damper half.
Repeat on the other shimmy damper half
- Cut the trailing edge to stay within the contour of the gear leg
fairing trailing edge.
- Glue the two halves together with good quality waterproof glue. Clamp
to dry.
- I taped mine to the landing gear with packing tape. I may fiberglass
it on in the future, as described in the RV-6 plans.
--
Tim Lewis -- HEF (Manassas, VA)
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 350 hrs
Pascal said the following on 2/18/2013 10:55 AM:
[quote]
Tim;
Very nice setup. Do you, by any chance, have the dimensions? (width,
length, Height, size of the oval for the gear leg (how deep to fit)) I
know little about woodworking, except the pine wood derby I once
built, but I'll play around with this if I know what I 'm aiming for
in my garage.
Thx
--
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rv10flyer(at)live.com
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| Posted: Mon Feb 18, 2013 5:45 pm Post subject: Gear leg stiffeners |
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Thanks!
On Feb 18, 2013, at 5:04 PM, Tim Lewis <TimRVator(at)comcast.net> wrote:
[quote] Attached is the RV-6 plans section on shimmy dampers for reference, and a page of notes that I used in making my RV-10 dampers.
As I recall, here was my process for making a single shimmy damper:
- Start with 1"x2.5" fir, cut to the 12-13 degree angle depicted on my drawing (two pieces, mirror image). Plan to end up with pieces 22" long.
- Mark a line on the leading edge that will result in the damper half being 3/4" wide at the top, and about 1/2" wide at the bottom (my drawing says 11/32", I think that's incorrect).
- With the band saw table tilted 30 degrees, cut along that line, such that you have fabricated the leading edge of the shimmy damper half. Repeat on the other shimmy damper half
- Cut the trailing edge to stay within the contour of the gear leg fairing trailing edge.
- Glue the two halves together with good quality waterproof glue. Clamp to dry.
- I taped mine to the landing gear with packing tape. I may fiberglass it on in the future, as described in the RV-6 plans.
--
Tim Lewis -- HEF (Manassas, VA)
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 350 hrs
Pascal said the following on 2/18/2013 10:55 AM:
>
>
> Tim;
> Very nice setup. Do you, by any chance, have the dimensions? (width, length, Height, size of the oval for the gear leg (how deep to fit)) I know little about woodworking, except the pine wood derby I once built, but I'll play around with this if I know what I 'm aiming for in my garage.
> Thx
>
> --
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