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The old nose wheel shimmy issue
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Tim Olson



Joined: 25 Jan 2007
Posts: 2761

PostPosted: Thu Dec 28, 2017 6:22 am    Post subject: The old nose wheel shimmy issue Reply with quote

Sounds good on the progress Kelly. Wish I was in your
frigid location...our high yesterday was -1F, and today it's
a bit warmer but it comes with crappy weather. We won't be seeing
20F for any time in the 7 day forecast.

Regarding the recap tires, I've used recaps from Desser for the
mains, and also started using the 5" recaps for the RV-14 mains
as well, but I've never used them for the nosewheel yet. I've
always used the standard Van's Aero Classic on the nose. I've only
had to replace one, just one time, in 11 years on the RV-10, and
I did that when I swapped wheels to the proper wheel, so I
still have my original wheel and tire in the hangar as a spare
for either plane.

I do like the recaps on the mains. Saves money and seem to last
longer with the extra thickness. I think I used Monster 5"
on the RV-14 mains...did require opening up the fairings a bit
for their size. On the -10 I've used the 15-6.00 "High Performance
Retread" that they sell, not the monster.

Tim

On 12/28/2017 7:37 AM, Kelly McMullen wrote:
Quote:
Follow-up I am making sloooow progress on the nose gear shimmy issue. I
tightened the belleville nut to around 28 lbs, drilled new cotter pin
hole, added washer to the donut stack, went out and tried again.
Performed test, and got results so many reported....much better, but
shimmy still there at 12-16 kts. Borrowed a wheel balancer (Desser used
to sell, stand with axle, cones,external bearings) and sure enough, nose
wheel required the same 1.5 oz of wt. Some report lead wts hard to
find.  I used steel wts, but likely will replace with lead later to
better concentrate the wt. Available lead weights:
http://www.matcomfg.com/WEIGHTLEADBALANCE-idv-3682-44.html
I note that with research, nose wheel shimmy is common, which may
trigger main gear shimmy. Many nose wheels require balancing, and almost
all need 1.5 oz directly opposite the valve stem.
When I am satisfied that I have the balance as good as can get, will
test again. After reading reports that go back at least 8 years, the
problem and solutions are pretty uniform...belleville nut force, donut
compression and balancing of the wheel, with almost identical weight
needed in same place. I do have the correct Matco wheel and axle, and a
Desser recap nose tire with the tube that Tim recommends.
I will balance the mains after I rotate the tires for outside wear.
Kelly

P.S. From frigid Aridzona with 36 right now, going to 71 this afternoon.
No, I don't miss the -20 in MN and WI, nor the -50 from Fairbanks. 8^)


-sent from the I-droid implanted in my forearm

On Mon, Dec 18, 2017 at 8:04 AM, Kelly McMullen <apilot2(at)gmail.com
<mailto:apilot2(at)gmail.com>> wrote:

Thanks Tim. Yes, I had 3 friends observe my taxi in from last flight
and comment on how much the nose wheel was shimmying.
Yes, I have had main gear shimmy in the past. Nose is at lower speed
and higher frequency shimmy.
I'll check with the fish scale, get somewhere around 25-30 lb pull
and then drill new hole.

-sent from the I-droid implanted in my forearm

On Mon, Dec 18, 2017 at 7:54 AM, Tim Olson <Tim(at)myrv10.com
<mailto:Tim(at)myrv10.com>> wrote:



I have 2 holes in my gear leg to provide for a little more
adjustment precision.   No big deal on that.

Are you 100% sure that the shimmy is nosewheel? I really doubt
it is.  Almost everyone who has a shimmy, has it in the
mains, although it FEELS like a nosewheel shimmy.  I really
don't find much for issue with the nosewheel at all, other
than making sure you have a good breakout force on the
rotation.  And, of course, there is that need to take out the
play of the donuts occasionally.  I can't remember how many
I have in there, but at least 2.
Tim




On 12/18/2017 08:40 AM, Kelly McMullen wrote:

Well, mine has gotten noticeable enough to do something
about. Of course I reviewed my archives and Tim's website as
refresher.
Taking the cowling off and checking things I found that I
could not tighten the big nut to the next flat, so the
amount of pull is irrelevant at the moment.
Has anyone tried new Belleville washers?
Secondly, I noticed about a 1/4" of up/down play on the nose
gear leg, which I assume is compression of the donuts. (I am
at about 130 hours).
Will check today to see if another washer is needed. Yes, I
have done the service bulletin upgrade, and there was no
play at the time.
I guess the next step will be to get a wheel balancer and
balance the nose wheel. Then do the mains at annual
condition inspection.
Has anyone drilled the bottom of the gear leg to get an
intermediate cotter pin position for the pivot nut?
-sent from the I-droid implanted in my forearm


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Kellym



Joined: 10 Jan 2006
Posts: 1545
Location: Sun Lakes AZ

PostPosted: Thu Dec 28, 2017 6:29 am    Post subject: The old nose wheel shimmy issue Reply with quote

I thought I wrote Minus 20.
I remember walking to grade school in EauClaire uphill both ways through
3' of snow at -30f. (wink, wink)
Kelly
You could be in AZ in 8 hours with that magic 10 or 14.

On 12/28/2017 7:22 AM, Tim Olson wrote:
Quote:


Sounds good on the progress Kelly.  Wish I was in your
frigid location...our high yesterday was -1F, and today it's
a bit warmer but it comes with crappy weather.  We won't be seeing
20F for any time in the 7 day forecast.



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KCHD
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Tim Olson



Joined: 25 Jan 2007
Posts: 2761

PostPosted: Thu Dec 28, 2017 6:39 am    Post subject: The old nose wheel shimmy issue Reply with quote

Yeah, it isn't so bad right now. It's when it's lower than -20
that it gets more painful. I'm thinking of going for a swim
in the Chippewa today. Smile

That really is the beauty of the RV-10, folks. I tell people
all the time that from where I live, I can be anywhere in the
lower 48 in 12 hours or less. There's no excuse not to travel
by RV with the capabilities these planes have.
(although today I'd need known icing to get out of here I think)

Tim
On 12/28/2017 8:28 AM, Kelly McMullen wrote:
Quote:


I thought I wrote Minus 20.
I remember walking to grade school in EauClaire uphill both ways through
3' of snow at -30f. (wink, wink)
Kelly
You could be in AZ in 8 hours with that magic 10 or 14.

On 12/28/2017 7:22 AM, Tim Olson wrote:
>
>
> Sounds good on the progress Kelly.  Wish I was in your
> frigid location...our high yesterday was -1F, and today it's
> a bit warmer but it comes with crappy weather.  We won't be seeing
> 20F for any time in the 7 day forecast.
>



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Kellym



Joined: 10 Jan 2006
Posts: 1545
Location: Sun Lakes AZ

PostPosted: Thu Dec 28, 2017 6:46 am    Post subject: The old nose wheel shimmy issue Reply with quote

Yeah, at about -20 the Chippewa starts emitting fog.
Talk of small world, the A&P I borrowed the wheel balancer from grew up
less than 3 blocks from the house I grew up in, in EauClaire, went to
same grade school, about 4 yrs behind me, now works as mechanic at
Chandler Airport.

On 12/28/2017 7:38 AM, Tim Olson wrote:
Quote:


Yeah, it isn't so bad right now.  It's when it's lower than -20
that it gets more painful. I'm thinking of going for a swim
in the Chippewa today. Smile

That really is the beauty of the RV-10, folks.  I tell people
all the time that from where I live, I can be anywhere in the
lower 48 in 12 hours or less.  There's no excuse not to travel
by RV with the capabilities these planes have.
(although today I'd need known icing to get out of here I think)

Tim


On 12/28/2017 8:28 AM, Kelly McMullen wrote:
>
>
> I thought I wrote Minus 20.
> I remember walking to grade school in EauClaire uphill both ways
> through 3' of snow at -30f. (wink, wink)
> Kelly
> You could be in AZ in 8 hours with that magic 10 or 14.
>
> On 12/28/2017 7:22 AM, Tim Olson wrote:
>>
>>
>> Sounds good on the progress Kelly.  Wish I was in your
>> frigid location...our high yesterday was -1F, and today it's
>> a bit warmer but it comes with crappy weather.  We won't be seeing
>> 20F for any time in the 7 day forecast.
>>
>







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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD
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