Today's Message Index:
----------------------
1. 05:38 AM - Re: Viton o-rings (charlie heathco)
2. 09:37 AM - Fitting The Spinner To A Hartzell (Matt Dralle)
3. 10:26 AM - Re: Fitting The Spinner To A Hartzell (Louis Willig)
4. 11:44 AM - Nosewheel vibration update (jhnstniii@AOL.COM)
5. 12:43 PM - Re: Nosewheel vibration update (Jeff Orear)
6. 02:54 PM - Re: Nosewheel vibration update (dave.gribble@mchsi.com)
7. 03:23 PM - Re: Nosewheel vibration update (Carl Froehlich)
8. 04:25 PM - Re: Nosewheel vibration update (jhnstniii@AOL.COM)
9. 04:45 PM - Re: Nosewheel vibration update (Kelly McMullen)
10. 05:09 PM - Re: Nosewheel vibration update (Carl Froehlich)
11. 06:26 PM - Re: Nosewheel vibration update (Darrell Reiley)
Message 1
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Subject: | Re: Viton o-rings |
Ok, thanks a bunch for those numbers. Chalrie
----- Original Message -----
From: Tailgummer@aol.com
To: rv-list@matronics.com
Sent: Saturday, August 29, 2009 08:34
Subject: Re: RV-List: Viton o-rings
From Randy Lervold's site:
Standard MS replacement O-rings areMS28775-218; 2-218V-75 are the
Viton O-rings. Try Ace Seal: http://www.aceseal.com.
The High temp fluid is: . MIL-H-83282. Google Royco 782 or Aeroshell
31.
John D
In a message dated 8/29/2009 3:36:52 A.M. Pacific Daylight Time,
cheathco@cox.net writes:
I thought I had the part # someone gave me in reply to my sticking
left brake problem, but as sometimes happens It seems to have gotten
lost in the shuffel. This is for my RV6A. Can you repeat it pls? Im
also going to strongly consider changing to the high temmp fluid. I
assume a qt will do the job? Tnaks, Charlie Heathco
="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/
Navigator?RV-List
ms.matronics.com/">http://forums.matronics.com
tp://www.matronics.com/contribution">http://www.matronics.com/contributio
n
Message 2
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Subject: | Fitting The Spinner To A Hartzell |
Listers,
Hartzell recommends a minimum .1" clearance around the prop blade for the spinner.
I did that exactly, but the prop would still bang on the spinner at full
pitch. I had to hog out to .25" to keep the clearance at .1" at full pitch.
It looked stupid having such a large gap in one area only so I evened it up to
.25" all the way around. But now it kind of looks like I made the holes too
big. I just can't recall seeing other installations to know if my .25" is "too
much". Anyone have any pics or thoughts on the clearance using late-model Van's
CS spinner and a Hartzell, particularly the 72" paddle blades I've got?
Thanks!
Matt Dralle
RV-8 #82880 N998RV
http://www.mykitlog.com/dralle
Message 3
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Subject: | Re: Fitting The Spinner To A Hartzell |
At 12:35 PM 8/30/2009, you wrote:
>
>
><<Listers,
>
>Hartzell recommends a minimum .1" clearance around the prop blade
>for the spinner. I did that exactly, but the prop would still bang
>on the spinner at full pitch. I had to hog out to .25" to keep the
>clearance at .1" at full pitch. It looked stupid having such a
>large gap in one area only so I evened it up to .25" all the way
>around. But now it kind of looks like I made the holes too big. I
>just can't recall seeing other installations to know if my .25" is
>"too much". Anyone have any pics or thoughts on the clearance using
>late-model Van's CS spinner and a Hartzell, particularly the 72"
>paddle blades I've got?>>
Hi Matt,
Look, its a constant speed prop. It will never look like the close
fitted spinner of your old fixed pitch. Unless you plan to enter a
CAFE race or try out at Reno, leave the .25" gap. This, of course is
my opinion, but, my -4 has a similar gap and I think nothing of it.
Louis I Willig
1640 Oakwood Dr.
Penn Valley, PA 19072
610 668-4964
RV-4, N180PF
190HP IO-360, C/S prop
Message 4
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Subject: | Nosewheel vibration update |
Listers--Promised I would report on our efforts to stop the vertical vibration
of our nosewheel/pant assembly. We started with the tire. We bought a motorcycle
wheel balancer (simple rod rolling on ball bearing supports type) and immediately
noticed the tire was quite out of round and out of balance.?We thought
"problem solved" and bought a new tire.?This one was round.?We added weights until
it was balanced, and?during taxi testing were surprised to find there was
no improvement.? We then tried different combinations of tire pressure and bearing
torque (within the required limits).?The best was with very low tire pressure
and medium torque, but we still had the problem at?20 mph or more.? So?then
we glassed?a piece of wood (with four layers of medium weight glass) on to
the leg from the bend at the bottom up to where it enters the cowling, hoping
to change the vibration characteristics.?No improvement!? I wonder if a little
lead in the nose or tail of the pant might help (th
e pant is balanced fore and aft right now so doing this would actually?unbalance
it). We are running out of ideas. One of our hangar buddies was up at OSH watching
the RVs taxi by for takeoff and he said many of them had vibrating nosewheels.
We have the new type nosewheel fork. Don't know if there is a vibrational
difference between this type and the old type. Any ideas? Thanks. LeRoy Johnston
and David White RV-6A N176LD Esperanza 200+ hours flying.????????????????
Message 5
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Subject: | Re: Nosewheel vibration update |
This may seem rather rudimentary, but are you sure it is your
nosewheel that is shimmying? I thought I had a nosewheel shake as
well until a local pilot saw me land while waiting at the hold short
line and reported that my left main was the culprit. I suspect uneven
tire wear, but balancing out the wheel/tire resulted in some
improvement. I plan to replace the main tires/tubes at next
conditional inspection.
Just a thought.
Regards,
Jeff Orear
RV6A N782P
Peshtigo, WI
On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com wrote:
> Listers--Promised I would report on our efforts to stop the vertical
> vibration of our nosewheel/pant assembly. We started with the tire.
> We bought a motorcycle wheel balancer (simple rod rolling on ball
> bearing supports type) and immediately noticed the tire was quite
> out of round and out of balance. We thought "problem solved" and
> bought a new tire. This one was round. We added weights until it was
> balanced, and during taxi testing were surprised to find there was
> no improvement. We then tried different combinations of tire
> pressure and bearing torque (within the required limits). The best
> was with very low tire pressure and medium torque, but we still had
> the problem at 20 mph or more. So then we glassed a piece of wood
> (with four layers of medium weight glass) on to the leg from the
> bend at the bottom up to where it enters the cowling, hoping to
> change the vibration characteristics. No improvement! I wonde r if
> a little lead in the nose or tail of the pant might help (the pant
> is balanced fore and aft right now so doing this would actually
> unbalance it). We are running out of ideas. One of our hangar
> buddies was up at OSH watching the RVs taxi by for takeoff and he
> said many of them had vibrating nosewheels. We have the new type
> nosewheel fork. Don't know if there is a vibrational difference
> between this type and the old type. Any ideas? Thanks. LeRoy
> Johnston and David White RV-6A N176LD Esperanza 200+ hours flying.
>
>
Message 6
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Subject: | Re: Nosewheel vibration update |
Some people have installed a $40 Matco axle that reduces rolling friction... and
some people have changed to a $300 Grove nosewheel with conventional felt seals
(instead of rubber seals) to reduce rolling friction. What setup are you
running?
-------------- Original message ----------------------
From: jhnstniii@aol.com
>
> Listers--Promised I would report on our efforts to stop the vertical vibration
> of our nosewheel/pant assembly. We started with the tire. We bought a motorcycle
> wheel balancer (simple rod rolling on ball bearing supports type) and
> immediately noticed the tire was quite out of round and out of balance.?We
> thought "problem solved" and bought a new tire.?This one was round.?We added
> weights until it was balanced, and?during taxi testing were surprised to find
> there was no improvement.? We then tried different combinations of tire pressure
> and bearing torque (within the required limits).?The best was with very low tire
> pressure and medium torque, but we still had the problem at?20 mph or more.?
> So?then we glassed?a piece of wood (with four layers of medium weight glass)
on
> to the leg from the bend at the bottom up to where it enters the cowling, hoping
> to change the vibration characteristics.?No improvement!? I wonder if a little
> lead in the nose or tail of the pant might help (th
> e pant is balanced fore and aft right now so doing this would
> actually?unbalance it). We are running out of ideas. One of our hangar buddies
> was up at OSH watching the RVs taxi by for takeoff and he said many of them had
> vibrating nosewheels. We have the new type nosewheel fork. Don't know if there
> is a vibrational difference between this type and the old type. Any ideas?
> Thanks. LeRoy Johnston and David White RV-6A N176LD Esperanza 200+ hours
> flying.????????????????
Message 7
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Subject: | Nosewheel vibration update |
Two things to try:
1. Install the MATCO nose wheel axle. Here is the link:
http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This allows
for the axle bolt to be fully tighten without too much pre-load on the
bearings. This help my 8A nose gear problem.
2. Do the same balance on the main gear that you did on the nose gear.
I noted a significant improvement on the nose gear shimmy after I replace my
main gear.
Carl Froehlich
RV-8A (525 hrs)
RV-10 (fuselage)
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Jeff Orear
Sent: Sunday, August 30, 2009 3:31 PM
Subject: Re: RV-List: Nosewheel vibration update
This may seem rather rudimentary, but are you sure it is your nosewheel that
is shimmying? I thought I had a nosewheel shake as well until a local pilot
saw me land while waiting at the hold short line and reported that my left
main was the culprit. I suspect uneven tire wear, but balancing out the
wheel/tire resulted in some improvement. I plan to replace the main
tires/tubes at next conditional inspection.
Just a thought.
Regards,
Jeff Orear
RV6A N782P
Peshtigo, WI
On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com wrote:
Listers--Promised I would report on our efforts to stop the vertical
vibration of our nosewheel/pant assembly. We started with the tire. We
bought a motorcycle wheel balancer (simple rod rolling on ball bearing
supports type) and immediately noticed the tire was quite out of round and
out of balance. We thought "problem solved" and bought a new tire. This one
was round. We added weights until it was balanced, and during taxi testing
were surprised to find there was no improvement. We then tried different
combinations of tire pressure and bearing torque (within the required
limits). The best was with very low tire pressure and medium torque, but we
still had the problem at 20 mph or more. So then we glassed a piece of wood
(with four layers of medium weight glass) on to the leg from the bend at the
bottom up to where it enters the cowling, hoping to change the vibration
characteristics. No improvement! I wonde r if a little lead in the nose or
tail of the pant might help (the pant is balanced fore and aft right now so
doing this would actually unbalance it). We are running out of ideas. One of
our hangar buddies was up at OSH watching the RVs taxi by for takeoff and he
said many of them had vibrating nosewheels. We have the new type nosewheel
fork. Don't know if there is a vibrational difference between this type and
the old type. Any ideas? Thanks. LeRoy Johnston and David White RV-6A N176LD
Esperanza 200+ hours flying.
href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/N
avigator?RV-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contri
bution
Message 8
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Subject: | Re: Nosewheel vibration update |
We balanced the mains and they are round--no improvement. They don't vibrate.?
It is very obviously the nose wheel because we've taxied by with one of us as
observer at various speeds and with the stick in various positions.? The pant/wheel
assembly is going up and down and you can feel it in the cockpit. We have
the bearing with the rubber seals that has to be torqued to spec. Will check
out the MATCO axle. Thanks.????
-----Original Message-----
From: Carl Froehlich <carl.froehlich@verizon.net>
Sent: Sun, Aug 30, 2009 6:20 pm
Subject: RE: RV-List: Nosewheel vibration update
Two things to try:
1.????? Install the MATCO nose wheel axle.? Here is the link: http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html? This allows for the axle bolt to be fully tighten without too much pre-load on the bearings.? This help my 8A nose gear problem.
2.????? Do the same balance on the main gear that you did on the nose gear.? I
noted a significant improvement on the nose gear shimmy after I replace my main
gear.
?
Carl Froehlich
RV-8A (525 hrs)
RV-10 (fuselage)
?
?
From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Jeff Orear
Sent: Sunday, August 30, 2009 3:31 PM
Subject: Re: RV-List: Nosewheel vibration update
?
This may seem rather rudimentary, but are you sure it is your nosewheel that is
shimmying? ?I thought I had a nosewheel shake as well until a local pilot saw
me land while waiting at the hold short line and reported that my left main was
the culprit. ?I suspect uneven tire wear, but balancing out the wheel/tire
resulted in some improvement. ?I plan to replace the main tires/tubes at next
conditional inspection.
?
Just a thought. ?
?
?
Regards,
?
Jeff Orear
RV6A ?N782P
Peshtigo, WI
?
?
On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com wrote:
Listers--Promised I would report on our efforts to stop the vertical vibration
of our nosewheel/pant assembly. We started with the tire. We bought a motorcycle
wheel balancer (simple rod rolling on ball bearing supports type) and immediately
noticed the tire was quite out of round and out of balance.?We thought
"problem solved" and bought a new tire.?This one was round.?We added weights until
it was balanced, and?during taxi testing were surprised to find there was
no improvement.? We then tried different combinations of tire pressure and bearing
torque (within the required limits).?The best was with very low tire pressure
and medium torque, but we still had the problem at?20 mph or more.? So?then
we glassed?a piece of wood (with four layers of medium weight glass) on to
the leg from the bend at the bottom up to where it enters the cowling, hoping
to change the vibration characteristics.?No improvement!? I wonde r if a little
lead in the nose or tail of the pant might help (t
he pant is balanced fore and aft right now so doing this would actually?unbalance
it). We are running out of ideas. One of our hangar buddies was up at OSH
watching the RVs taxi by for takeoff and he said many of them had vibrating nosewheels.
We have the new type nosewheel fork. Don't know if there is a vibrational
difference between this type and the old type. Any ideas? Thanks. LeRoy
Johnston and David White RV-6A N176LD Esperanza 200+ hours flying.????????????????
?
href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
?
?
?
?
http://www.matronics.com/Navigator?RV-List
http://forums.matronics.com
http://www.matronics.com/contribution
?
Message 9
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Subject: | Re: Nosewheel vibration update |
Also balance the wheel pant. Lead shot can be glassed in to accomplish
this, so the wheel pant is balanced about the axle.
jhnstniii@aol.com wrote:
> We balanced the mains and they are round--no improvement. They don't
> vibrate. It is very obviously the nose wheel because we've taxied by
> with one of us as observer at various speeds and with the stick in
> various positions. The pant/wheel assembly is going up and down and you
> can feel it in the cockpit. We have the bearing with the rubber seals
> that has to be torqued to spec. Will check out the MATCO axle. Thanks.
>
>
> -----Original Message-----
> From: Carl Froehlich <carl.froehlich@verizon.net>
> To: rv-list@matronics.com
> Sent: Sun, Aug 30, 2009 6:20 pm
> Subject: RE: RV-List: Nosewheel vibration update
>
> Two things to try:
> 1. Install the MATCO nose wheel axle. Here is the link:
> http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This
> allows for the axle bolt to be fully tighten without too much pre-load
> on the bearings. This help my 8A nose gear problem.
> 2. Do the same balance on the main gear that you did on the nose
> gear. I noted a significant improvement on the nose gear shimmy after I
> replace my main gear.
>
> Carl Froehlich
> RV-8A (525 hrs)
> RV-10 (fuselage)
>
>
> *From:* owner-rv-list-server@matronics.com
> <mailto:owner-rv-list-server@matronics.com>
> [mailto:owner-rv-list-server@matronics.com
> <mailto:owner-rv-list-server@matronics.com?>] *On Behalf Of *Jeff Orear
> *Sent:* Sunday, August 30, 2009 3:31 PM
> *To:* rv-list@matronics.com <mailto:rv-list@matronics.com>
> *Subject:* Re: RV-List: Nosewheel vibration update
>
> This may seem rather rudimentary, but are you sure it is your nosewheel
> that is shimmying? I thought I had a nosewheel shake as well until a
> local pilot saw me land while waiting at the hold short line and
> reported that my left main was the culprit. I suspect uneven tire wear,
> but balancing out the wheel/tire resulted in some improvement. I plan
> to replace the main tires/tubes at next conditional inspection.
>
> Just a thought.
>
>
> Regards,
>
> Jeff Orear
> RV6A N782P
> Peshtigo, WI
>
>
> On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com
> <mailto:jhnstniii@aol.com> wrote:
>
>
> Listers--Promised I would report on our efforts to stop the vertical
> vibration of our nosewheel/pant assembly. We started with the tire. We
> bought a motorcycle wheel balancer (simple rod rolling on ball bearing
> supports type) and immediately noticed the tire was quite out of round
> and out of balance. We thought "problem solved" and bought a new
> tire. This one was round. We added weights until it was balanced,
> and during taxi testing were surprised to find there was no
> improvement. We then tried different combinations of tire pressure and
> bearing torque (within the required limits). The best was with very low
> tire pressure and medium torque, but we still had the problem at 20 mph
> or more. So then we glassed a piece of wood (with four layers of medium
> weight glass) on to the leg from the bend at the bottom up to where it
> enters the cowling, hoping to change the vibration characteristics. No
> improvemen t! I wonde r if a little lead in the nose or tail of the
> pant might help (the pant is balanced fore and aft right now so doing
> this would actually unbalance it). We are running out of ideas. One of
> our hangar buddies was up at OSH watching the RVs taxi by for takeoff
> and he said many of them had vibrating nosewheels. We have the new type
> nosewheel fork. Don't know if there is a vibrational difference between
> this type and the old type. Any ideas? Thanks. LeRoy Johnston and David
> White RV-6A N176LD Esperanza 200+ hours flying.
>
> * *
>
> *href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List <http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List>*
>
> *href="http://forums.matronics.com">http://forums.matronics.com <http://forums.matronics.com">http://forums.matronics.com>*
>
> *href="http://www.matronics.com/contribution">http://www.matronics.com/contribution <http://www.matronics.com/contribution">http://www.matronics.com/contribution>*
>
> * *
>
>
>
> * *
>
> * *
>
> **
>
> **
>
> **
>
> **
>
> **
>
> **
>
> *http://www.matronics.com/Navigator?RV-List*
>
> **
>
> **
>
> **
>
> *http://forums.matronics.com <http://forums.matronics.com/>*
>
> **
>
> **
>
> **
>
> **
>
> *http://www.matronics.com/contribution*
>
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Message 10
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Subject: | Nosewheel vibration update |
Ok.
When you get the MATCO axle, set it up so the wheel spins easily - just
tight enough so there is no bearing slop.
Carl
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of jhnstniii@aol.com
Sent: Sunday, August 30, 2009 7:24 PM
Subject: Re: RV-List: Nosewheel vibration update
We balanced the mains and they are round--no improvement. They don't
vibrate. It is very obviously the nose wheel because we've taxied by with
one of us as observer at various speeds and with the stick in various
positions. The pant/wheel assembly is going up and down and you can feel it
in the cockpit. We have the bearing with the rubber seals that has to be
torqued to spec. Will check out the MATCO axle. Thanks.
-----Original Message-----
From: Carl Froehlich <carl.froehlich@verizon.net>
Sent: Sun, Aug 30, 2009 6:20 pm
Subject: RE: RV-List: Nosewheel vibration update
Two things to try:
1. Install the MATCO nose wheel axle. Here is the link:
<http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html>
http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html This allows
for the axle bolt to be fully tighten without too much pre-load on the
bearings. This help my 8A nose gear problem.
2. Do the same balance on the main gear that you did on the nose gear.
I noted a significant improvement on the nose gear shimmy after I replace my
main gear.
Carl Froehlich
RV-8A (525 hrs)
RV-10 (fuselage)
From: <mailto:owner-rv-list-server@matronics.com>
owner-rv-list-server@matronics.com [
<mailto:owner-rv-list-server@matronics.com?>
mailto:owner-rv-list-server@matronics.com] On Behalf Of Jeff Orear
Sent: Sunday, August 30, 2009 3:31 PM
Subject: Re: RV-List: Nosewheel vibration update
This may seem rather rudimentary, but are you sure it is your nosewheel that
is shimmying? I thought I had a nosewheel shake as well until a local pilot
saw me land while waiting at the hold short line and reported that my left
main was the culprit. I suspect uneven tire wear, but balancing out the
wheel/tire resulted in some improvement. I plan to replace the main
tires/tubes at next conditional inspection.
Just a thought.
Regards,
Jeff Orear
RV6A N782P
Peshtigo, WI
On Aug 30, 2009, at 1:21 PM, <mailto:jhnstniii@aol.com> jhnstniii@aol.com
wrote:
Listers--Promised I would report on our efforts to stop the vertical
vibration of our nosewheel/pant assembly. We started with the tire. We
bought a motorcycle wheel balancer (simple rod rolling on ball bearing
supports type) and immediately noticed the tire was quite out of round and
out of balance. We thought "problem solved" and bought a new tire. This one
was round. We added weights until it was balanced, and during taxi testing
were surprised to find there was no improvement. We then tried different
combinations of tire pressure and bearing torque (within the required
limits). The best was with very low tire pressure and medium torque, but we
still had the problem at 20 mph or more. So then we glassed a piece of wood
(with four layers of medium weight glass) on to the leg from the bend at the
bottom up to where it enters the cowling, hoping to change the vibration
characteristics. No improvemen t! I wonde r if a little lead in the nose or
tail of the pant might help (the pant is balanced fore and aft right now so
doing this would actually unbalance it). We are running out of ideas. One of
our hangar buddies was up at OSH watching the RVs taxi by for takeoff and he
said many of them had vibrating nosewheels. We have the new type nosewheel
fork. Don't know if there is a vibrational difference between this type and
the old type. Any ideas? Thanks. LeRoy Johnston and David White RV-6A N176LD
Esperanza 200+ hours flying.
href=" <http://www.matronics.com/Navigator?RV-List>
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Subject: | Re: Nosewheel vibration update |
OMG... I've heard it all now :-)
--- On Sun, 8/30/09, Kelly McMullen <kellym@aviating.com> wrote:
> From: Kelly McMullen <kellym@aviating.com>
> Subject: Re: RV-List: Nosewheel vibration update
> To: rv-list@matronics.com
> Date: Sunday, August 30, 2009, 6:43 PM
> Kelly McMullen <kellym@aviating.com>
>
> Also balance the wheel pant. Lead shot can be glassed in to
> accomplish this, so the wheel pant is balanced about the
> axle.
>
> jhnstniii@aol.com
> wrote:
> > We balanced the mains and they are round--no
> improvement. They don't vibrate. It is very obviously
> the nose wheel because we've taxied by with one of us as
> observer at various speeds and with the stick in various
> positions. The pant/wheel assembly is going up and
> down and you can feel it in the cockpit. We have the bearing
> with the rubber seals that has to be torqued to spec. Will
> check out the MATCO axle. Thanks.
> >
> > -----Original Message-----
> > From: Carl Froehlich <carl.froehlich@verizon.net>
> > To: rv-list@matronics.com
> > Sent: Sun, Aug 30, 2009 6:20 pm
> > Subject: RE: RV-List: Nosewheel vibration update
> >
> > Two things to try:
> > 1. Install the MATCO nose wheel
> axle. Here is the link: http://www.matcomfg.com/AXLEASSEMBLYA24125INCH-idv-3657-1.html
> This allows for the axle bolt to be fully tighten without
> too much pre-load on the bearings. This help my 8A
> nose gear problem.
> > 2. Do the same balance on the main
> gear that you did on the nose gear. I noted a
> significant improvement on the nose gear shimmy after I
> replace my main gear.
> > Carl Froehlich
> > RV-8A (525 hrs)
> > RV-10 (fuselage)
> >*From:* owner-rv-list-server@matronics.com
> <mailto:owner-rv-list-server@matronics.com>
> [mailto:owner-rv-list-server@matronics.com
> <mailto:owner-rv-list-server@matronics.com?>]
> *On Behalf Of *Jeff Orear
> > *Sent:* Sunday, August 30, 2009 3:31 PM
> > *To:* rv-list@matronics.com
> <mailto:rv-list@matronics.com>
> > *Subject:* Re: RV-List: Nosewheel vibration update
> > This may seem rather rudimentary, but are you
> sure it is your nosewheel that is shimmying? I thought
> I had a nosewheel shake as well until a local pilot saw me
> land while waiting at the hold short line and reported that
> my left main was the culprit. I suspect uneven tire
> wear, but balancing out the wheel/tire resulted in some
> improvement. I plan to replace the main tires/tubes at
> next conditional inspection.
> > Just a thought. Regards,
> > Jeff Orear
> > RV6A N782P
> > Peshtigo, WI
> >On Aug 30, 2009, at 1:21 PM, jhnstniii@aol.com
> <mailto:jhnstniii@aol.com>
> wrote:
> >
> >
> > Listers--Promised I would report on our efforts to
> stop the vertical vibration of our nosewheel/pant assembly.
> We started with the tire. We bought a motorcycle wheel
> balancer (simple rod rolling on ball bearing supports type)
> and immediately noticed the tire was quite out of round and
> out of balance. We thought "problem solved" and bought a new
> tire. This one was round. We added weights until it was
> balanced, and during taxi testing were surprised to find
> there was no improvement. We then tried different
> combinations of tire pressure and bearing torque (within the
> required limits). The best was with very low tire pressure
> and medium torque, but we still had the problem at 20 mph or
> more. So then we glassed a piece of wood (with four
> layers of medium weight glass) on to the leg from the bend
> at the bottom up to where it enters the cowling, hoping to
> change the vibration characteristics. No improvemen t!
> I wonde r if a little lead in the nose or tail of the pant
> might help (the pant is balanced fore and aft right now so
> doing this would actually unbalance it). We are running out
> of ideas. One of our hangar buddies was up at OSH watching
> the RVs taxi by for takeoff and he said many of them had
> vibrating nosewheels. We have the new type nosewheel fork.
> Don't know if there is a vibrational difference between this
> type and the old type. Any ideas? Thanks. LeRoy Johnston and
> David White RV-6A N176LD Esperanza 200+ hours flying.
>
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