Today's Message Index:
----------------------
0. 12:15 AM - A Message From AeroElectric's Bob Nuckolls... (Matt Dralle)
1. 12:55 AM - Landing Gear Shimmy on RV8a (Charles Brame)
2. 03:49 AM - Re: Landing Gear Shimmy on RV8a (Hopperdhh@aol.com)
3. 06:56 AM - Re: Landing Gear Shimmy on RV8a (mr.gsun@gmail.com)
4. 06:58 AM - Re: Landing Gear Shimmy on RV8a (Charles Kuss)
5. 07:16 AM - Re: Landing Gear Shimmy on RV8a (Robin Marks)
6. 08:55 AM - Re: Landing Gear Shimmy on RV8a (thomas sargent)
7. 01:31 PM - Re: Landing Gear Shimmy on RV8a (Doug Weiler)
Message 0
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Subject: | A Message From AeroElectric's Bob Nuckolls... |
Dear Listers,
The well known Bob Nuckolls of the AeroElectric posted a great message Monday on
the AeroElectric-List regarding the Matronics Lists and the importance of supporting
the operation during the Fund Raiser. Please take a minute to read Bob's
commentary below, reposted to the other Matronics Lists with his permission...
Date: Mon, 05 Nov 2012 08:58:41 -0600
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: AeroElectric-List: Re: Please Make A Contribution Today!
At 02:14 AM 11/5/2012, Matt Dralle wrote:
>
> Each year at the end of the List Fund Raiser, I post a message
> acknowledging everyone that so generously made a Contribution to
> support the Lists. Its my way of publicly thanking everyone that
> took a minute to show their appreciation for the Lists.
>
I will add my voice to this suggestion. It's
easy to enjoy the benefits of what's available to us
off-the-shelves at the corner mega-marts. It's
seldom that we give pause to learn and understand the
processes and tools that made it possible to reach out
and select from dozens of options.
This, and all civil societies, runs on talent, energy
and mobility. Mobility exploited by thousands of hands,
machines and transportation that figure into the
'infrastructure' that puts the boxes of Wheaties and
Pop Tarts on the shelves.
See "I pencil" http://tinyurl.com/36xkhq
Any break in that chain of time, talent and resources
at least interrupts if not totally halts flow of
that benefit. Matt's room full of byte-thrashers is
like the natural gas pumping station a few miles from
my house. If those pumps stop, who ever is expecting
the furnace to come on at the other end of the pipe
is at risk for reduced service and/or higher costs
for that service.
Matt's yearly endeavor to keep his pumps running is
a trivial burden on the members of the Lists
but of incalculable value to those who participate
on them. No donation is too small.
We go to a fly-in a willingly chuck a few bucks into
the coffee can at the drinks and donuts table, let's
chuck a few bucks into Matt's coffee can too. 50,000
pounds of value doesn't get to the shelves on time
if one 18-wheeler runs out of gas. The T-bytes of
data flow we all enjoy don't get from your keyboard
to the screens of others unless Matt pays the light
bill and strokes the machines to keep them happy.
No, $5 won't get you a free copy of the 'Connection
or a fuel sampler but it will go toward the assurance
that logging onto your favorite List will open
doors that you would be sorely missed should you find
that hitting the return key doesn't produce the
expected response.
$5 from every List customer on Matt's system will
go a very long way to keeping the byte-pumps running.
$More$ will go a long way to upgrading the size
and quality of the machines as the old ones get
long in the tooth. No matter what size of donation
you choose . . . please do it now . . .
Bob . . .
Please make your Contribution today to support the continued operation and upgrade
of these services. You can pick up a really nice gift for making your Contribution
too!
You may use a Credit Card or Paypal at the Matronics Contribution Site here:
http://www.matronics.com/contribution
or, you can send a personal check to the following address:
Matronics / Matt Dralle
581 Jeannie Way
Livermore, CA 94550
Matt Dralle
Matronics Email List Administrator
Message 1
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Subject: | Landing Gear Shimmy on RV8a |
I had similar shimmy problems on my 6A. I tried balancing the tires
with little or no help. Van's answer was to reduce the tire pressure.
As I remember, Van's recommendation was about 20 psi. My shimmy
stopped at 25 psi and I have used that ever since. I have found that
lower to higher ambient temperature will change the tire pressure
enough that the shimmy will sometimes return. Likewise, my 25 psi
flatland tire pressure didn't work in Denver, and lowering the tire
pressure to less than 20 psi solved that.
Another possible cause is the axle nut(s) being too tight. Make sure
all the tires will spin freely with the airplane jacked up. I had that
problem with the nose gear which caused the nose gear to bounce
vertically on landing. Basically, the axle was too tight due to the
design, and the tire wouldn't freely rotate more than 1/2 turn. I went
to a Grove wheel and axle and that solved that problem.
Charlie Brame
RV-6A N11CB
San Antonio
-----------------------------------------------------------
> Time: 03:08:03 PM PST US
> Subject: RV-List: Landing Gear Shimmy on RV8a
> From: "fastpilotrv8" <fastpilotrv8@aol.com>
>
>
> I on my 2002 RV8a has had the landing gear shimmy has gotten much
> worse in the
> last 6 flights . I am running 45 lbs air , no flats spots . The
> mains are really
> shaking a lot. anyone with Ideas please watch the video on You Tube
> and
> please give me your Ideas
>
> http://www.youtube.com/watch?v=_HrcTKt3zBc
>
> my email is fastpilotrv8@aol.com
Message 2
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Subject: | Re: Landing Gear Shimmy on RV8a |
Hi ??,
The nose wheel looks to have low tire pressure but does not shake. Could
it be the mains have too much pressure? I run about 38 to start with in my
RV7A (200 HP) mains. By the time I add air they're usually down to about
32. I've been told they shake a lot though.
What changed in the last 6 flights? Do the wheels turn free, or are the
bearings too loose? Maybe clean up the bearings and look for signs of
corrosion, etc. Could it be that it has always done this and you just became
aware of it? Look at the brakes,too. Could they be getting into the act
somehow?
Back to the nose wheel. I have the AntiSplat gear leg brace, and now run
50 PSI in the nose tire. Only have a few hours since putting it on. So
far, so good!
Just some ideas.
Dan Hopper
N766DH
In a message dated 11/5/2012 6:08:35 P.M. Eastern Standard Time,
fastpilotrv8@aol.com writes:
--> RV-List message posted by: "fastpilotrv8" <fastpilotrv8@aol.com>
I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in
the last 6 flights . I am running 45 lbs air , no flats spots . The
mains are really shaking a lot. anyone with Ideas please watch the video on
You Tube and please give me your Ideas
http://www.youtube.com/watch?v=_HrcTKt3zBc
my email is fastpilotrv8@aol.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=386965#386965
Message 3
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Subject: | Re: Landing Gear Shimmy on RV8a |
My thought when I saw your video was that something is loose. Did you
jack it up and really wiggle everything good? I run 35-37 psI and have a
small amount of shimmy sometimes when increasing taxi speed. If I touch
the brakes, it goes away and all is well.
I found that lower pressure helps my landings, eliminates shimmy but rubs
on the wheel pants on touchdown. Rubbing on the sidewalls of my expensive
Michelin tires bothered me.
How do you attach your camera to the wing? I see the suction cups for the
GoPro camera but just don't trust that. Do you back out a few screws from
the wing and screw down a mounting plate?
Greg
do not archive
On Tue, Nov 6, 2012 at 12:54 AM, Charles Brame <chasb@satx.rr.com> wrote:
> I had similar shimmy problems on my 6A. I tried balancing the tires with
> little or no help. Van's answer was to reduce the tire pressure. As I
> remember, Van's recommendation was about 20 psi. My shimmy stopped at 25
> psi and I have used that ever since. I have found that lower to higher
> ambient temperature will change the tire pressure enough that the shimmy
> will sometimes return. Likewise, my 25 psi flatland tire pressure didn't
> work in Denver, and lowering the tire pressure to less than 20 psi solved
> that.
>
> Another possible cause is the axle nut(s) being too tight. Make sure all
> the tires will spin freely with the airplane jacked up. I had that problem
> with the nose gear which caused the nose gear to bounce vertically on
> landing. Basically, the axle was too tight due to the design, and the tire
> wouldn't freely rotate more than 1/2 turn. I went to a Grove wheel and
> axle and that solved that problem.
>
> Charlie Brame
> RV-6A N11CB
> San Antonio
>
> -----------------------------------------------------------
>
>
> Time: 03:08:03 PM PST US
> Subject: RV-List: Landing Gear Shimmy on RV8a
> From: "fastpilotrv8" <fastpilotrv8@aol.com>
>
>
> I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in
> the
> last 6 flights . I am running 45 lbs air , no flats spots . The mains
> are really
> shaking a lot. anyone with Ideas please watch the video on You Tube and
> please give me your Ideas
>
> http://www.youtube.com/watch?v=_HrcTKt3zBc
>
> my email is fastpilotrv8@aol.com
>
> *
>
> *
>
>
Message 4
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Subject: | Landing Gear Shimmy on RV8a |
Robin,
-Is there a way to visually determine if you have the 9A legs? How do the
y differ from the 8A units?
Charlie
--- On Mon, 11/5/12, Robin Marks <robin@painttheweb.com> wrote:
From: Robin Marks <robin@painttheweb.com>
Subject: RE: RV-List: Landing Gear Shimmy on RV8a
Ok, I hate to take you way off the reservation here but Vans miss-shipped s
ome RV-8A kits with RV-9A gear legs. Ask me how I know? I purchased a parti
ally built kit from about your era (Builder # 80721) and it shipped with th
e 9A legs. We knew something was not right when we tried to align the wheel
s. This was most obvious when pushing backwards. The only reason I of know
this is the same thing happened to at least 2 other 8A builders that contac
ted me through the list. We cleaned up the legs and returned them to Vans f
or a free replacement ~8+ years later. (Thank you Vans!). At least one flew
several hours before discovering the issue. Mine would not push backwards
more than a few feet w/o skipping so I have no idea one can push in/out the
plane in this configuration. Now this is pretty unlikely to be your issue
and I am sure that others will chime in on the shimmy problem. Just wanted
to let you know of the gear leg issue just in case.
Robin
-----Original Message-----
From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matro
nics.com] On Behalf Of fastpilotrv8
Sent: Monday, November 05, 2012 3:07 PM
Subject: RV-List: Landing Gear Shimmy on RV8a
I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in
the last 6 flights .- I am running 45 lbs air , no flats spots .- The m
ains are really shaking a lot.- anyone with Ideas please watch the video
on You Tube and please give me your Ideas
http://www.youtube.com/watch?v=_HrcTKt3zBc
my email is- - fastpilotrv8@aol.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=386965#386965
le, List Admin.
Message 5
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Subject: | Landing Gear Shimmy on RV8a |
I don't know if you can tell visually but they will be a touch "toe in" and
when rolling the plane in reverse they will splay a bit and then skip. It
seemed to roll forward more normally then it would when pushed in reverse.
The alignment was not immediately obvious (just a few degrees) but the reve
rse push test made the misalignment obvious.
Good luck,
Robin
From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matro
nics.com] On Behalf Of Charles Kuss
Sent: Tuesday, November 06, 2012 6:59 AM
Subject: RE: RV-List: Landing Gear Shimmy on RV8a
Robin,
Is there a way to visually determine if you have the 9A legs? How do they
differ from the 8A units?
Charlie
--- On Mon, 11/5/12, Robin Marks <robin@painttheweb.com<mailto:robin@paintt
heweb.com>> wrote:
From: Robin Marks <robin@painttheweb.com<mailto:robin@painttheweb.com>>
Subject: RE: RV-List: Landing Gear Shimmy on RV8a
s.com<mailto:rv-list@matronics.com>>
se?to=robin@painttheweb.com>>
Ok, I hate to take you way off the reservation here but Vans miss-shipped s
ome RV-8A kits with RV-9A gear legs. Ask me how I know? I purchased a parti
ally built kit from about your era (Builder # 80721) and it shipped with th
e 9A legs. We knew something was not right when we tried to align the wheel
s. This was most obvious when pushing backwards. The only reason I of know
this is the same thing happened to at least 2 other 8A builders that contac
ted me through the list. We cleaned up the legs and returned them to Vans f
or a free replacement ~8+ years later. (Thank you Vans!). At least one flew
several hours before discovering the issue. Mine would not push backwards
more than a few feet w/o skipping so I have no idea one can push in/out the
plane in this configuration. Now this is pretty unlikely to be your issue
and I am sure that others will chime in on the shimmy problem. Just wanted
to let you know of the gear leg issue just in case.
Robin
-----Original Message-----
From: owner-rv-list-server@matronics.com</mc/compose?to=owner-rv-list-ser
ver@matronics.com> [mailto:owner-rv-list-server@matronics.com</mc/compose?t
o=owner-rv-list-server@matronics.com>] On Behalf Of fastpilotrv8
Sent: Monday, November 05, 2012 3:07 PM
Subject: RV-List: Landing Gear Shimmy on RV8a
pose?to=fastpilotrv8@aol.com>>
I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in
the last 6 flights . I am running 45 lbs air , no flats spots . The mains
are really shaking a lot. anyone with Ideas please watch the video on You
Tube and please give me your Ideas
http://www.youtube.com/watch?v=_HrcTKt3zBc
my email is fastpilotrv8@aol.com</mc/compose?to=fastpilotrv8@aol.com>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=386965#386965
* The Builder's Bookstore www.buildersbooks.com<br<http://www.builders
books.com%3cbr> --> http://www.m============
<http://www.matronics.com/contribution>
rsbooks.com>
m>
Message 6
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Subject: | Re: Landing Gear Shimmy on RV8a |
I had a similar problem on my RV-6A. Lower tire pressure helped. What
solved the problem was replacing the original equipment tires (which wore
out in a year anyway) with Michelin Condors. I normally keep 30 - 32ps in
the tires.
--
Tom Sargent
Message 7
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Subject: | Re: Landing Gear Shimmy on RV8a |
I'd try two things. Bring the tire pressure down to about 30 psi. If
that doesn't work I'd change the brand of tires. I had similar issues
with my first RV-4 and this process worked.
Doug Weiler
RV-4 finished and flying
RV-7 finished and flying
On 11/5/2012 5:07 PM, fastpilotrv8 wrote:
>
> I on my 2002 RV8a has had the landing gear shimmy has gotten much worse in the
last 6 flights . I am running 45 lbs air , no flats spots . The mains are
really shaking a lot. anyone with Ideas please watch the video on You Tube and
please give me your Ideas
>
> http://www.youtube.com/watch?v=_HrcTKt3zBc
>
> my email is fastpilotrv8@aol.com
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=386965#386965
>
>
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