Today's Message Index:
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1. 05:38 AM - Re: The old nose wheel shimmy issue (Kelly McMullen)
2. 06:22 AM - Re: The old nose wheel shimmy issue (Tim Olson)
3. 06:29 AM - Re: The old nose wheel shimmy issue (Kelly McMullen)
4. 06:39 AM - Re: The old nose wheel shimmy issue (Tim Olson)
5. 06:46 AM - Re: The old nose wheel shimmy issue (Kelly McMullen)
Message 1
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| Subject: | Re: The old nose wheel shimmy issue |
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@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@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
>>>
>>
>>
>>
>>
>>
>
Message 2
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| Subject: | Re: The old nose wheel shimmy issue |
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:
> 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@gmail.com
> <mailto:apilot2@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@myrv10.com
> <mailto:Tim@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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>
>
Message 3
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| Subject: | Re: The old nose wheel shimmy issue |
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.
>
Message 4
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| Subject: | Re: The old nose wheel shimmy issue |
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. :)
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.
>>
>
Message 5
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| Subject: | Re: The old nose wheel shimmy issue |
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:
>
> 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. :)
>
> 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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