Today's Message Index:
----------------------
1. 09:49 AM - Re: Nosewheel shimmy (Dale Larsen)
2. 10:22 AM - Re: Nosewheel shimmy (John Spicer)
3. 10:23 AM - Re: Nosewheel shimmy (John Spicer)
4. 10:33 AM - Re: Nosewheel shimmy (fcs@jlc.net)
5. 10:34 AM - Re: Nosewheel shimmy (fcs@jlc.net)
6. 09:01 PM - Nose Wheel Shimmy (Laurel Mckone)
7. 09:01 PM - Re: Nosewheel shimmy (Ralph Cloud)
Message 1
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| Subject: | Re: Nosewheel shimmy |
--> RV9-List message posted by: "Dale Larsen" <slickrock@been-there.com>
Axle bolt tension is good, breakout tension is adjusted per plans with a
fish scale. Tire pressure is good, and wheel rotates freely.
On closer investigation, it only occurs at the end of the rollout, when you
start to brake hard. If you don't brake at all, it dosent shimmy. I would
think that if it were due to a balance condition that it would be
poportional to the speed of the wheel.
No shimmy on takeoff.
> --> RV9-List message posted by: "fcs@jlc.net" <fcs@jlc.net>
>
>
> > It moves 1 to 1-1/2 inches at about a 3 Hz rate.
> > Maybe the wheel is out of balance?
> > Dale
>
> Wow, and you say you can't feel this?!? I suppose it is possible that
> your tube is folded or pinched inside the tire, causing major imbalance.
> If you think this is the case, you should immediately take the wheel apart
> and check. Trust me, you don't want to experience a flat tire. Some
> degree of bouncing is to be expected with a spring type nose gear leg, but
> that's way more than I have seen. Check your axle bolt tension while
> you're at it and make sure your wheel is rotating freely. Also check your
> nose fork breakout tension. If it is too loose the wheel can wobble
> violently from side to side just as it touches the pavement. Use a
> fish-scale to actually set it per Vans instructions. The fork must have a
> good bit of tension and not just swivel freely. If you can't find the
> culprit, I would give Vans a call and see if they have any further clues.
>
>
Message 2
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| Subject: | Re: Nosewheel shimmy |
--> RV9-List message posted by: "John Spicer" <spike@spikesplace.org>
Is your brake rotors true ?
----- Original Message -----
From: "Dale Larsen" <slickrock@been-there.com>
Subject: Re: RV9-List: Nosewheel shimmy
> --> RV9-List message posted by: "Dale Larsen" <slickrock@been-there.com>
>
> Axle bolt tension is good, breakout tension is adjusted per plans with a
> fish scale. Tire pressure is good, and wheel rotates freely.
>
> On closer investigation, it only occurs at the end of the rollout, when you
> start to brake hard. If you don't brake at all, it dosent shimmy. I would
> think that if it were due to a balance condition that it would be
> poportional to the speed of the wheel.
>
> No shimmy on takeoff.
>
Message 3
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| Subject: | Re: Nosewheel shimmy |
--> RV9-List message posted by: "John Spicer" <spike@spikesplace.org>
Oops, "Are" your brake rotors true ? Its been a rough morning :)
> Is your brake rotors true ?
>
> ----- Original Message -----
> From: "Dale Larsen" <slickrock@been-there.com>
> To: <rv9-list@matronics.com>
> Sent: Thursday, September 30, 2004 12:48 PM
> Subject: Re: RV9-List: Nosewheel shimmy
>
>
> > --> RV9-List message posted by: "Dale Larsen" <slickrock@been-there.com>
> >
> > Axle bolt tension is good, breakout tension is adjusted per plans with a
> > fish scale. Tire pressure is good, and wheel rotates freely.
> >
> > On closer investigation, it only occurs at the end of the rollout, when you
> > start to brake hard. If you don't brake at all, it dosent shimmy. I would
> > think that if it were due to a balance condition that it would be
> > poportional to the speed of the wheel.
> >
> > No shimmy on takeoff.
> >
>
Message 4
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| Subject: | Re: Nosewheel shimmy |
--> RV9-List message posted by: "fcs@jlc.net" <fcs@jlc.net>
> Axle bolt tension is good, breakout tension is adjusted per plans with a
> fish scale. Tire pressure is good, and wheel rotates freely.
> On closer investigation, it only occurs at the end of the rollout, when
you
> start to brake hard. If you don't brake at all, it dosent shimmy. I
would
> think that if it were due to a balance condition that it would be
> poportional to the speed of the wheel.
> No shimmy on takeoff.
OK, now it's getting strange... Have you EVER overtightened the axle
bolt? The only theory I can cook up to explain your symptoms is as
follows: If your bearings are scored or damaged, then independent
application of brakes will naturally increase the side-loads on the
bearings. If the bearings are scored or damaged in any way, this could
cause binding and wheel hop. ...boy is that a stretch, but... Anyone else
got a theory to offer?
Message 5
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| Subject: | Re: Nosewheel shimmy |
--> RV9-List message posted by: "fcs@jlc.net" <fcs@jlc.net>
At this point, you may want to verify that your nose gear leg is not bent
or installed crooked to.
Message 6
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| Subject: | Nose Wheel Shimmy |
--> RV9-List message posted by: "Laurel Mckone" <lmckone@xtalwind.net>
I had the same problem, I took a piece of tubing and cut it to the propper length
so that I could tighten the nose wheel bolt and keep the spacers from turning
and still have the nose wheel turn easy. Use a piece of dowel just long enough
to hold the tubing between the spacers and slide the dowel out with the nose
wheel bolt, leaving the tubing onthe bolt between the spacers while installing
the wheel.
Laurel McKone N120LM
Message 7
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| Subject: | Nosewheel shimmy |
--> RV9-List message posted by: "Ralph Cloud" <rv9ralph@flash.net>
Is it possible that at you brake the pressure on the nose tire increases
causing the tire to spread under load and rubbing against the wheel pant
causing it to shudder? Check the gap between the tire & wheel pant, and
remember when a load is on the tire it will spread to the sides. When the
rotation gets faster it will expand from the center of rotation.
Ralph
Wings, fuse on order
Livermore, CA
do not archive
> -----Original Message-----
> From: owner-rv9-list-server@matronics.com
> [mailto:owner-rv9-list-server@matronics.com]On Behalf Of Dale Larsen
> Sent: Thursday, September 30, 2004 9:49 AM
> To: rv9-list@matronics.com
> Subject: Re: RV9-List: Nosewheel shimmy
>
>
> --> RV9-List message posted by: "Dale Larsen" <slickrock@been-there.com>
>
> Axle bolt tension is good, breakout tension is adjusted per plans with a
> fish scale. Tire pressure is good, and wheel rotates freely.
>
> On closer investigation, it only occurs at the end of the
> rollout, when you
> start to brake hard. If you don't brake at all, it dosent
> shimmy. I would
> think that if it were due to a balance condition that it would be
> poportional to the speed of the wheel.
>
> No shimmy on takeoff.
>
> > --> RV9-List message posted by: "fcs@jlc.net" <fcs@jlc.net>
> >
> >
> > > It moves 1 to 1-1/2 inches at about a 3 Hz rate.
> > > Maybe the wheel is out of balance?
> > > Dale
> >
> > Wow, and you say you can't feel this?!? I suppose it is possible that
> > your tube is folded or pinched inside the tire, causing major imbalance.
> > If you think this is the case, you should immediately take the
> wheel apart
> > and check. Trust me, you don't want to experience a flat tire. Some
> > degree of bouncing is to be expected with a spring type nose
> gear leg, but
> > that's way more than I have seen. Check your axle bolt tension while
> > you're at it and make sure your wheel is rotating freely. Also
> check your
> > nose fork breakout tension. If it is too loose the wheel can wobble
> > violently from side to side just as it touches the pavement. Use a
> > fish-scale to actually set it per Vans instructions. The fork
> must have a
> > good bit of tension and not just swivel freely. If you can't find the
> > culprit, I would give Vans a call and see if they have any
> further clues.
> >
> >
>
>
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