Author: "Larry Bowen" <larry@...> Time: Tue Dec 21, 2004 8:13 am PST Link
Related question:
My tires came with two dots painted on them. A dark red (almost black?),
and a pale yellow dot. I lined up the valve stem with the dark red dot.
I have slight but noticable shimmy immediately after lift off. I'm
wondering if I should have lined up the valve stem with the yellow dot.
Anyone know?
-
Larry Bowen, RV-8, 47.7 hrs.
Larry@BowenAero.com
http://BowenAero.com
Matthew said:
> It is a simple as throwing them in the spare parts bin. You don't
> used them in the RV application. (Of course, took me an hour to
> figure this out.)
>
> Matthew
> RV-9A Canopy
> www.n523rv.com
> --- In vansairforce@yahoogroups.com, "wolfrv684015" <wolfrv6@a...>
> wrote:
>> What is the trick when mounting the valve stem through the rim?
>> Cleveland gives you two nuts and a washer. Are they to adjust the
>> length of the valve stems coming out of the rim? I cannot find any
>> information on this. May be simple, but not to me.
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Author: "rp10294648" <f1rocket@...> Time: Tue Dec 21, 2004 10:14 am PST Link
As I understand it, the yellow dot should be aligned with the valve
stem. If you are using the tire that came with the kit, you'll be
replacing it after the first year anyway.
Randy
F1 Rocket
www.pflanzer-aviation.com
--- In vansairforce@yahoogroups.com, "Larry Bowen" <larry@b...> wrote:
>
> Related question:
>
> My tires came with two dots painted on them. A dark red (almost
black?),
> and a pale yellow dot. I lined up the valve stem with the dark red
dot.
> I have slight but noticable shimmy immediately after lift off. I'm
> wondering if I should have lined up the valve stem with the yellow
dot.
> Anyone know?
>
> -
> Larry Bowen, RV-8, 47.7 hrs.
> Larry@B...
> http://BowenAero.com
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Author: "Cary Rhodes" <rhodeseng@...> Time: Tue Dec 21, 2004 1:18 pm PST Link
gentlemen
I'm not casting any dispersions here and am only making this
comment/question for knowledge.
how can a tire that is round be mated to an unknown rim or hub and
have to be oriented to a particular spot.
I might could understand if both parts had been spin tested or
balanced in some way and a 'most advantageous' combination chosen.
But for one to be an unknown, I don't see that one position could be
better than another.
cary rhodes
--- In vansairforce@yahoogroups.com, "rp10294648" <f1rocket@c...>
wrote:
> As I understand it, the yellow dot should be aligned with the valve
> stem. If you are using the tire that came with the kit, you'll be
> replacing it after the first year anyway.
>
> Randy
> F1 Rocket
> www.pflanzer-aviation.com
>
> --- In vansairforce@yahoogroups.com, "Larry Bowen" <larry@b...>
wrote:
> >
> > Related question:
> >
> > My tires came with two dots painted on them. A dark red (almost
> black?),
> > and a pale yellow dot. I lined up the valve stem with the dark
red
> dot.
> > I have slight but noticable shimmy immediately after lift off.
I'm
> > wondering if I should have lined up the valve stem with the
yellow
> dot.
> > Anyone know?
> >
> > -
> > Larry Bowen, RV-8, 47.7 hrs.
> > Larry@B...
> > http://BowenAero.com
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Author: John Myers <jmyers@...> Time: Tue Dec 21, 2004 2:31 pm PST Link
Cary,
I have always heard that the red dot supposedly denotes the lightest part
of the tire and therefore should be mated with the valve stem of the tube
because that should be the heaviest location of the tube. I have always
been a little skeptical because with the hole cut in the rim, the addition
of the tube stem and the so called light spot of the tire, would there be
more than an ounce difference and if so I wonder where that ounce
difference might be. Anyway, I have passed along what I have been told and
still wonder about.
I personally, usually match up the red dot with the valve stem and then go
fly to check it out. FWIW, the last time I changed a tire with a new GY
Flight Special II, I ended up taking it back off and putting the weather
checked one back on because it was so much better balance or round
(whichever was causing gear gyrations and shake). I still have to tap the
brakes after I lift off to stop the gear shake.
I guess the "color alignment" stuff is to help us get a so called best
chance starting place for balance.
Still wondering too, but the "rest of the story follows"
The more official answer from Desser is quoted as follows for tube type
aircraft wheels: ( I added the emphasis)
Their web site covering this is at http://www.desser.com/mounting.html
"Use the correct tire and tube for the wheel assembly.
Clean inside of tire, then lubricate lightly with talc.
Inflate tube to slightly round, and insert in tire.
Align yellow stripe on tube with red balance dot on tire. Align red dot
with valve if no stripe on tube.
When mounting tire and tube on wheel, be sure that wheel bolts are torqued
to wheel manufacturer's instructions before inflating.
Inflate tire in a safety cage to rated pressure.
Deflate assembly to equalize stretch.
Reinflate to rated pressure.
After 12 hour stretch period, reinflate to rated inflation pressure.
NOTE: Aircraft tubes are made of 100% natural rubber and will diffuse
limited amounts of inflation gas. Check inflation pressure prior to each
flight.
If pressure drops more than 5 percent in the next 24 hours:
Check valve core for leakage.
If OK, disassemble tire/tube from wheels and check tube for leaks. Replace
tube if necessary."
End quote.
Hope this helps.
John
At 03:03 PM 12/21/2004, you wrote:
>gentlemen
>
>I'm not casting any dispersions here and am only making this
>comment/question for knowledge.
>
>how can a tire that is round be mated to an unknown rim or hub and
>have to be oriented to a particular spot.
>
>I might could understand if both parts had been spin tested or
>balanced in some way and a 'most advantageous' combination chosen.
>
>But for one to be an unknown, I don't see that one position could be
>better than another.
>
>cary rhodes
[Non-text portions of this message have been removed]
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Author: "steve zicree" <szicree@...> Time: Tue Dec 21, 2004 2:32 pm PST Link
Good point. I just figured that the dot indicates the lightest side of the tire and they want us to align it with the valve stem, which would be the heaviest side of the tube. Or maybe the dot is just there so that we can more easily find the stem when checking tire pressures. Hmmm?
----- Original Message -----
From: Cary Rhodes
To: vansairforce@yahoogroups.com
Sent: Tuesday, December 21, 2004 1:03 PM
Subject: [VAF Mailing List] Re: Tire Balance
gentlemen
I'm not casting any dispersions here and am only making this
comment/question for knowledge.
how can a tire that is round be mated to an unknown rim or hub and
have to be oriented to a particular spot.
I might could understand if both parts had been spin tested or
balanced in some way and a 'most advantageous' combination chosen.
But for one to be an unknown, I don't see that one position could be
better than another.
cary rhodes
--- In vansairforce@yahoogroups.com, "rp10294648" <f1rocket@c...>
wrote:
> As I understand it, the yellow dot should be aligned with the valve
> stem. If you are using the tire that came with the kit, you'll be
> replacing it after the first year anyway.
>
> Randy
> F1 Rocket
> www.pflanzer-aviation.com
>
> --- In vansairforce@yahoogroups.com, "Larry Bowen" <larry@b...>
wrote:
> >
> > Related question:
> >
> > My tires came with two dots painted on them. A dark red (almost
> black?),
> > and a pale yellow dot. I lined up the valve stem with the dark
red
> dot.
> > I have slight but noticable shimmy immediately after lift off.
I'm
> > wondering if I should have lined up the valve stem with the
yellow
> dot.
> > Anyone know?
> >
> > -
> > Larry Bowen, RV-8, 47.7 hrs.
> > Larry@B...
> > http://BowenAero.com
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Author: "Barry Ward" <barry.ward@...> Time: Wed Dec 22, 2004 5:04 am PST Link
John wrote
"...............I personally, usually match up the red dot with the
valve stem and then go
fly to check it out. FWIW, the last time I changed a tire with a new
GY
Flight Special II, I ended up taking it back off and putting the
weather
checked one back on because it was so much better balance or round
(whichever was causing gear gyrations and shake). I still have to
tap the
brakes after I lift off to stop the gear shake.
I guess the "color alignment" stuff is to help us get a so called
best
chance starting place for balance......."
Concerning the red dot on the tire it should be aligned with the
valve. However you mention problems with the Goodyear Flight Custom
II tires.
I had exactly the same problem and tried balancing the wheels,
trying different tire pressures etc. After much effort I came to
the conclusion that the square profile of the tire and perhaps the
harder materiel used by the tire is not suitable for the RV6A type
main gear. In the end I gave the tires away and am now using the
Air Hawk tires that I believe Van's are now shipping with their
kits. They give longer life than the Air Trainer tires that Van's
initially shipped. The round profile of the Air Hawk tires seems to
avoid most of the vibration and shaking of the main gear legs that
the square profile tires produced. I have however noticed with my
plane that if I inflate the tires much above 40 psi there is also a
tendancy for the gear legs to start shaking at certain taxiing
speeds.
Barry
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Author: plaurence@... Time: Fri Dec 24, 2004 5:23 pm PST Link
Barry
It may not be the tires. You may solve the problem by dampening the gear legs.
See http://www.vansairforce.net/turtlewooddesign/roger.htm
Peter
> I had exactly the same problem and tried balancing the wheels,
> trying different tire pressures etc. After much effort I came to the
> conclusion that the square profile of the tire and perhaps the harder
> materiel used by the tire is not suitable for the RV6A type main gear.
> In the end I gave the tires away and am now using the Air Hawk tires
> that I believe Van's are now shipping with their kits. They give
> longer life than the Air Trainer tires that Van's initially shipped.
> The round profile of the Air Hawk tires seems to avoid most of the
> vibration and shaking of the main gear legs that the square profile
> tires produced. I have however noticed with my plane that if I
> inflate the tires much above 40 psi there is also a tendancy for the
> gear legs to start shaking at certain taxiing speeds.
>
> Barry
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Author: "Richard & Roberta Hegy" <rhegy@...> Time: Sat Dec 25, 2004 6:34 am PST Link
Very True, Barry. I have put the gear leg stiffeners on my 7A and have never experienced any wheel balance or shaking problems. I have received comments that my gear looks rock solid, when taxiing, compared to RVs that do not have the stiffeners. I think builders who do not install them are missing out on a smoother operating airplane.
JMHO
Roberta
----- Original Message -----
From: plaurence@the-beach.net
To: vansairforce@yahoogroups.com
Sent: Friday, December 24, 2004 7:01 AM
Subject: Re: [VAF Mailing List] Re: Tire Balance
Barry
It may not be the tires. You may solve the problem by dampening the gear legs.
See http://www.vansairforce.net/turtlewooddesign/roger.htm
Peter
> I had exactly the same problem and tried balancing the wheels,
> trying different tire pressures etc. After much effort I came to the
> conclusion that the square profile of the tire and perhaps the harder
> materiel used by the tire is not suitable for the RV6A type main gear.
> In the end I gave the tires away and am now using the Air Hawk tires
> that I believe Van's are now shipping with their kits. They give
> longer life than the Air Trainer tires that Van's initially shipped.
> The round profile of the Air Hawk tires seems to avoid most of the
> vibration and shaking of the main gear legs that the square profile
> tires produced. I have however noticed with my plane that if I
> inflate the tires much above 40 psi there is also a tendancy for the
> gear legs to start shaking at certain taxiing speeds.
>
> Barry
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Author: "Barry Ward" <barry.ward@...> Time: Sat Dec 25, 2004 10:26 am PST Link
Many thanks Roberta for yours and Peter's advice on the wooden
stiffners for the main gear legs. I never fitted them when
finishing my RV in early 1999 as there was a modification at that
time to the nose wheel leg. Vans came out with a change to the nose
wheel leg design which as well as redesigning the metal leg also
removed the wooden support/fairing which was "bondoed" on to it.
This was to allow the nose wheel leg support to bend in a naturel
manner as there had been previously two nose gear leg failures. If
I ever get around to removing the main wheel leg fairings in the
future I will consider adding the wooden supports. However if I
keep the tire pressure at 40 psi or below everything seems to be
fine as there is no shaking.
Barry RV6A 600 hours.
--- In vansairforce@yahoogroups.com, "Richard & Roberta Hegy"
<rhegy@w...> wrote:
>
> Very True, Barry. I have put the gear leg stiffeners on my 7A and
have never experienced any wheel balance or shaking problems. I have
received comments that my gear looks rock solid, when taxiing,
compared to RVs that do not have the stiffeners. I think builders
who do not install them are missing out on a smoother operating
airplane.
>
> JMHO
> Roberta
]
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