Today's Message Index:
----------------------
1. 01:28 AM - Fuel Return Line Fittings (Gerd + Uli Nowack)
2. 05:30 AM - Re: Landing gear shimmy (Dennis W. Wilt)
3. 06:25 AM - Re: Landing gear shimmy (James, Clive R)
4. 06:45 AM - Re: Landing gear shimmy (Dennis W. Wilt)
5. 07:15 AM - Re: Landing gear shimmy (Bob Haas)
6. 07:18 AM - Re: Landing gear shimmy (Dennis W. Wilt)
7. 07:31 AM - Re: Landing gear shimmy (Tex Mantell)
8. 07:53 AM - Re: Landing gear shimmy (Bernard Melendez, Jr.)
9. 12:50 PM - Re: Landing gear shimmy (Bill Strahan)
10. 06:10 PM - Re: Landing gear shimmy (Bill Strahan)
11. 11:03 PM - Official Lightning-List FAQ (Frequently Asked Questions) (Matt Dralle)
12. 11:16 PM - Official Lightning-List Usage Guidelines (Matt Dralle)
Message 1
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| Subject: | Fuel Return Line Fittings |
Since my last posting I got several mails from people who are interested
in my experience with the ULPower engine.
So I might not be the only user of that engine for long.
If you are considering the possible use of one of the ULPower engines in
your projected Lightning, remember that these engines need a fuel return
line and a connection to your tanks . I used A/C Spruce`s part no.
AN867-2 , which has a smaller inner diameter than the feed line
flanges that are already in the tanks. As you can see I had to epoxy
them on from the outside. It worked, but it was something I wish I had
avoided.
So you can do yourself a big favor and ask for a set of those fuel
tank connector fittings when you order your kit, to be installed from
the inside of the tank as they should be .
You can simply close them up with plugs if you reconsider and go for
the Jabiru engine .
Gerd Kit 89 D-ELIY
Message 2
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| Subject: | Re: Landing gear shimmy |
It would be nice to see some pictures of the stiffener as you built it and
as you complete the installation.
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: Bill Strahan <bill@gdsx.com>
Sent: Tue, May 1, 2012 1:37 am
Subject: Lightning-List: Landing gear shimmy
Hey, I've talked about this before, haven't I? I've had 3 big changes I wa
nted
o make for a long time: 1) Fix fuel distribution issue. 2) Make some sh
ort
ingtips. 3) Eliminate the landing gear shimmy.
I installed the flow straightener tube and vanes that Nick sent me about a
year
go. That did an amazing job. Perfect? No. Good enough that I'm not
onsidering installing fuel injection? Yep. So #1 is adressed.
I still need to make short wingtips, but my passenger yesterday asked "Why
does
t shake like that after you land?" GRRRRR.
So I bought an axe handle and started chatting with neighbors here on the
irport about cutting and shaping it. I figured I'd buy a 1.125" ball cutte
r
nd put a radius in it. Kept putting that off because it didn't sound like
fun.
Then it hit me: I really just need it stiffer in fore/aft flexing. And
hatever stiffener I make needs to glue to the gear leg so it needs to be a
very
ood fit. Nothing fits better than fiberglass built in-place!
I decided I would tape off the gear and lay up 3 laminations of 7oz cloth
irectly onto the back of the gear leg. I did that tonight, and it's curing
.
omorrow I'll sand the back of that and use some flock and 5 minute epoxy to
ttach a 1/8" thick piece of balsa wood that extends about 1.5" behind the g
ear.
nce that's cured I'll lay up about 6 layers of cloth on both sides of the
alsa, overlapping onto the section that's on the gear. So the gear shouldn
't
nd up much stiffer since it only has 1/8" thickness between the 6 layer
amination, but it should be SUPER stiff across the 1.5" section.
So I should get that done tomorrow, and let it cure overnight. Then I'll p
op it
ff the gear, trim it, and glue it onto the landing gear leg.
Any thoughts? Nick, any suggestions on the best adhesive to attach to the
gear?
hould I remove the paint or glue to the paint?
When I glue it I'll put a couple of zip ties around it to hold it while it
ures, and leave them on just in case it ever comes loose.
Fingers crossed, I can report in a few days that I have eliminated the dang
himmy once and for all.
ead this topic online here:
http://forums.matronics.com/viewtopic.php?p=372188#372188
-= - The Lightning-List Email Forum -
-= Use the Matronics List Features Navigator to browse
-= the many List utilities such as List Un/Subscription,
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Message 3
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| Subject: | Landing gear shimmy |
Hi Dennis, I don't think you could stick anything to a gear leg that
wouldn't come off when the leg flexed. Where wood has been fitted before
wasn't it held on with hose clips?
To hold the wood in place without hose clips I would have thought you
would need to 'bandage' it on with fibreglass tape. As you say, good fit
and glued but held all along so it has to flex with the leg.
For sticking things to aluminium there is a primer chemical, nasty
stuff, I don't know what it's called, some kind of chromate maybe, needs
painting on and curing with heat.
Interestingly I have Lighting gear legs on my Esqual but no shimmy, even
with the great big RV spats (which I took off, anyone want to buy
them?). Different wheels and brake discs though.
Just about to fit 6 ply tyres so maybe that will change :(
Good luck, regards, Clive
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of Dennis
W. Wilt
Sent: 01 May 2012 13:29
Subject: Re: Lightning-List: Landing gear shimmy
It would be nice to see some pictures of the stiffener as you built it
and as you complete the installation.
Dennis
N616DW (Arion Lightning <http://www.flylightning.net/> S/N 132)
-----Original Message-----
From: Bill Strahan <bill@gdsx.com>
Sent: Tue, May 1, 2012 1:37 am
Subject: Lightning-List: Landing gear shimmy
Hey, I've talked about this before, haven't I? I've had 3 big changes I
wanted
to make for a long time: 1) Fix fuel distribution issue. 2) Make
some short
wingtips. 3) Eliminate the landing gear shimmy.
I installed the flow straightener tube and vanes that Nick sent me about
a year
ago. That did an amazing job. Perfect? No. Good enough that I'm not
considering installing fuel injection? Yep. So #1 is adressed.
I still need to make short wingtips, but my passenger yesterday asked
"Why does
it shake like that after you land?" GRRRRR.
So I bought an axe handle and started chatting with neighbors here on
the
airport about cutting and shaping it. I figured I'd buy a 1.125" ball
cutter
and put a radius in it. Kept putting that off because it didn't sound
like fun.
Then it hit me: I really just need it stiffer in fore/aft flexing. And
whatever stiffener I make needs to glue to the gear leg so it needs to
be a very
good fit. Nothing fits better than fiberglass built in-place!
I decided I would tape off the gear and lay up 3 laminations of 7oz
cloth
directly onto the back of the gear leg. I did that tonight, and it's
curing.
Tomorrow I'll sand the back of that and use some flock and 5 minute
epoxy to
attach a 1/8" thick piece of balsa wood that extends about 1.5" behind
the gear.
Once that's cured I'll lay up about 6 layers of cloth on both sides of
the
balsa, overlapping onto the section that's on the gear. So the gear
shouldn't
end up much stiffer since it only has 1/8" thickness between the 6 layer
lamination, but it should be SUPER stiff across the 1.5" section.
So I should get that done tomorrow, and let it cure overnight. Then
I'll pop it
off the gear, trim it, and glue it onto the landing gear leg.
Any thoughts? Nick, any suggestions on the best adhesive to attach to
the gear?
Should I remove the paint or glue to the paint?
When I glue it I'll put a couple of zip ties around it to hold it while
it
cures, and leave them on just in case it ever comes loose.
Fingers crossed, I can report in a few days that I have eliminated the
dang
shimmy once and for all.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=372188#372188
" target=_blank
saprocessedanchor="true">http://www.matronics.com/Navigator?Lightning-L
i
st
rocessedanchor="true">http://forums.matronics.com
blank saprocessedanchor="true">http://www.matronics.com/contribution
Message 4
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| Subject: | Re: Landing gear shimmy |
Clive,
I don't think I am really interested in putting this modification on my Lig
htning, but the concept was interesting and I would like to see how it is d
one. I have the LSA gear on my Lightning and do not have a shimmy.
Have a wonderful day,
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: James, Clive R <clive.james@uk.bp.com>
Sent: Tue, May 1, 2012 9:25 am
Subject: RE: Lightning-List: Landing gear shimmy
Hi Dennis, I don=99t think you could stick anything to a gear leg tha
t wouldn=99t come off when the leg flexed. Where wood has been fitted
before wasn=99t it held on with hose clips?
To hold the wood in place without hose clips I would have thought you woul
d need to =98bandage=99 it on with fibreglass tape. As you say,
good fit and glued but held all along so it has to flex with the leg.
For sticking things to aluminium there is a primer chemical, nasty stuff, I
don=99t know what it=99s called, some kind of chromate maybe,
needs painting on and curing with heat.
Interestingly I have Lighting gear legs on my Esqual but no shimmy, even wi
th the great big RV spats (which I took off, anyone want to buy them?). Dif
ferent wheels and brake discs though.
Just about to fit 6 ply tyres so maybe that will change :(
Good luck, regards, Clive
From: owner-lightning-list-server@matronics.com [mailto:owner-lightning-lis
t-server@matronics.com] On Behalf Of Dennis W. Wilt
Sent: 01 May 2012 13:29
Subject: Re: Lightning-List: Landing gear shimmy
It would be nice to see some pictures of the stiffener as you built it and
as you complete the installation.
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: Bill Strahan <bill@gdsx.com>
Sent: Tue, May 1, 2012 1:37 am
Subject: Lightning-List: Landing gear shimmy
Hey, I've talked about this before, haven't I? I've had 3 big changes I wa
nted
to make for a long time: 1) Fix fuel distribution issue. 2) Make some s
hort
wingtips. 3) Eliminate the landing gear shimmy.
I installed the flow straightener tube and vanes that Nick sent me about a
year
ago. That did an amazing job. Perfect? No. Good enough that I'm not
considering installing fuel injection? Yep. So #1 is adressed.
I still need to make short wingtips, but my passenger yesterday asked "Why
does
it shake like that after you land?" GRRRRR.
So I bought an axe handle and started chatting with neighbors here on the
airport about cutting and shaping it. I figured I'd buy a 1.125" ball cutt
er
and put a radius in it. Kept putting that off because it didn't sound like
fun.
Then it hit me: I really just need it stiffer in fore/aft flexing. And
whatever stiffener I make needs to glue to the gear leg so it needs to be a
very
good fit. Nothing fits better than fiberglass built in-place!
I decided I would tape off the gear and lay up 3 laminations of 7oz cloth
directly onto the back of the gear leg. I did that tonight, and it's curin
g.
Tomorrow I'll sand the back of that and use some flock and 5 minute epoxy t
o
attach a 1/8" thick piece of balsa wood that extends about 1.5" behind the
gear.
Once that's cured I'll lay up about 6 layers of cloth on both sides of the
balsa, overlapping onto the section that's on the gear. So the gear should
n't
end up much stiffer since it only has 1/8" thickness between the 6 layer
lamination, but it should be SUPER stiff across the 1.5" section.
So I should get that done tomorrow, and let it cure overnight. Then I'll p
op it
off the gear, trim it, and glue it onto the landing gear leg.
Any thoughts? Nick, any suggestions on the best adhesive to attach to the
gear?
Should I remove the paint or glue to the paint?
When I glue it I'll put a couple of zip ties around it to hold it while it
cures, and leave them on just in case it ever comes loose.
Fingers crossed, I can report in a few days that I have eliminated the dang
shimmy once and for all.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=372188#372188
" target=_blank saprocessedanchor="true">http://www.matronics.com/Navig
ator?Lightning-List
rocessedanchor="true">http://forums.matronics.com
blank saprocessedanchor="true">http://www.matronics.com/contribution
http://www.matronics.com/Navigator?Lightning-List
http://forums.matronics.com
http://www.matronics.com/contribution
-= - The Lightning-List Email Forum -
-= Use the Matronics List Features Navigator to browse
-= the many List utilities such as List Un/Subscription,
-= Archive Search & Download, 7-Day Browse, Chat, FAQ,
-= Photoshare, and much much more:
-
-= --> http://www.matronics.com/Navigator?Lightning-List
-
-========================
-= - MATRONICS WEB FORUMS -
-= Same great content also available via the Web Forums!
-
-= --> http://forums.matronics.com
-
-========================
-= - List Contribution Web Site -
-= Thank you for your generous support!
-= -Matt Dralle, List Admin.
-= --> http://www.matronics.com/contribution
-========================
Message 5
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| Subject: | Re: Landing gear shimmy |
Hi Dennis, I missed your message re. gear shimmy. When does
it occur, can you isolate it as far as main or nose
wheel? Bob Haas S/N 00071 N330BH.
From: Dennis W. Wilt
Sent: Tuesday, May 01, 2012 9:45 AM
Subject: Re: Lightning-List: Landing gear shimmy
Clive,
I don't think I am really interested in putting this modification on my
Lightning, but the concept was interesting and I would like to see how
it is done. I have the LSA gear on my Lightning and do not have a
shimmy.
Have a wonderful day,
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: James, Clive R <clive.james@uk.bp.com>
Sent: Tue, May 1, 2012 9:25 am
Subject: RE: Lightning-List: Landing gear shimmy
Hi Dennis, I don=99t think you could stick anything to a gear leg
that wouldn=99t come off when the leg flexed. Where wood has been
fitted before wasn=99t it held on with hose clips?
To hold the wood in place without hose clips I would have thought you
would need to =98bandage=99 it on with fibreglass tape. As
you say, good fit and glued but held all along so it has to flex with
the leg.
For sticking things to aluminium there is a primer chemical, nasty
stuff, I don=99t know what it=99s called, some kind of
chromate maybe, needs painting on and curing with heat.
Interestingly I have Lighting gear legs on my Esqual but no shimmy, even
with the great big RV spats (which I took off, anyone want to buy
them?). Different wheels and brake discs though.
Just about to fit 6 ply tyres so maybe that will change :(
Good luck, regards, Clive
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com?] On Behalf Of Dennis
W. Wilt
Sent: 01 May 2012 13:29
Subject: Re: Lightning-List: Landing gear shimmy
It would be nice to see some pictures of the stiffener as you built it
and as you complete the installation.
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: Bill Strahan <bill@gdsx.com>
Sent: Tue, May 1, 2012 1:37 am
Subject: Lightning-List: Landing gear shimmy
Hey, I've talked about this before, haven't I? I've had 3 big changes I
wanted to make for a long time: 1) Fix fuel distribution issue. 2)
Make some short wingtips. 3) Eliminate the landing gear shimmy. I
installed the flow straightener tube and vanes that Nick sent me about a
year ago. That did an amazing job. Perfect? No. Good enough that I'm
not considering installing fuel injection? Yep. So #1 is adressed. I
still need to make short wingtips, but my passenger yesterday asked "Why
does it shake like that after you land?" GRRRRR. So I bought an axe
handle and started chatting with neighbors here on the airport about
cutting and shaping it. I figured I'd buy a 1.125" ball cutter and put
a radius in it. Kept putting that off because it didn't sound like fun.
Then it hit me: I really just need it stiffer in fore/aft flexing. And
whatever stiffener I make needs to glue to the gear leg so it needs to
be a very good fit. Nothing fits better than fiberglass built in-place!
I decided I would tape off the gear and lay up 3 laminations of 7oz
cloth directly onto the back of the gear leg. I did that tonight, and
it's curing. Tomorrow I'll sand the back of that and use some flock and
5 minute epoxy to attach a 1/8" thick piece of balsa wood that extends
about 1.5" behind the gear. Once that's cured I'll lay up about 6
layers of cloth on both sides of the balsa, overlapping onto the section
that's on the gear. So the gear shouldn't end up much stiffer since it
only has 1/8" thickness between the 6 layer lamination, but it should be
SUPER stiff across the 1.5" section. So I should get that done tomorrow,
and let it cure overnight. Then I'll pop it off the gear, trim it, and
glue it onto the landing gear leg. Any thoughts? Nick, any suggestions
on the best adhesive to attach to the gear? Should I remove the paint
or glue to the paint? When I glue it I'll put a couple of zip ties
around it to hold it while it cures, and leave them on just in case it
ever comes loose. Fingers crossed, I can report in a few days that I
have eliminated the dang shimmy once and for all. Read this topic
online here: http://forums.matronics.com/viewtopic.php?p=372188#372188
" target=_blank
saprocessedanchor="true">http://www.matronics.com/Navigator?Lightning-L
istrocessedanchor="true">http://forums.matronics.comblank
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Message 6
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| Subject: | Re: Landing gear shimmy |
Bob,
I have not had a problem with gear shimmy, yet.
Have a wonderful day,
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: Bob Haas <checkpoint2@comcast.net>
Sent: Tue, May 1, 2012 10:16 am
Subject: Re: Lightning-List: Landing gear shimmy
Hi Dennis, I missed your message re. gear shimmy. When does it
occur, can you isolate it as far as main or nose
wheel? Bob Haas S/N 00071 N330BH.
From: Dennis W. Wilt
Sent: Tuesday, May 01, 2012 9:45 AM
Subject: Re: Lightning-List: Landing gear shimmy
Clive,
I don't think I am really interested in putting this modification on my Lig
htning, but the concept was interesting and I would like to see how it is d
one. I have the LSA gear on my Lightning and do not have a shimmy.
Have a wonderful day,
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: James, Clive R <clive.james@uk.bp.com>
Sent: Tue, May 1, 2012 9:25 am
Subject: RE: Lightning-List: Landing gear shimmy
Hi Dennis, I don=99t think you could stick anything to a gear leg tha
t wouldn=99t come off when the leg flexed. Where wood has been fitted
before wasn=99t it held on with hose clips?
To hold the wood in place without hose clips I would have thought you woul
d need to =98bandage=99 it on with fibreglass tape. As you say,
good fit and glued but held all along so it has to flex with the leg.
For sticking things to aluminium there is a primer chemical, nasty stuff, I
don=99t know what it=99s called, some kind of chromate maybe,
needs painting on and curing with heat.
Interestingly I have Lighting gear legs on my Esqual but no shimmy, even wi
th the great big RV spats (which I took off, anyone want to buy them?). Dif
ferent wheels and brake discs though.
Just about to fit 6 ply tyres so maybe that will change :(
Good luck, regards, Clive
From: owner-lightning-list-server@matronics.com [mailto:owner-lightning-lis
t-server@matronics.com?] On Behalf Of Dennis W. Wilt
Sent: 01 May 2012 13:29
Subject: Re: Lightning-List: Landing gear shimmy
It would be nice to see some pictures of the stiffener as you built it and
as you complete the installation.
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: Bill Strahan <bill@gdsx.com>
Sent: Tue, May 1, 2012 1:37 am
Subject: Lightning-List: Landing gear shimmy
Hey, I've talked about this before, haven't I? I've had 3 big changes I wa
nted
to make for a long time: 1) Fix fuel distribution issue. 2) Make some s
hort
wingtips. 3) Eliminate the landing gear shimmy.
I installed the flow straightener tube and vanes that Nick sent me about a
year
ago. That did an amazing job. Perfect? No. Good enough that I'm not
considering installing fuel injection? Yep. So #1 is adressed.
I still need to make short wingtips, but my passenger yesterday asked "Why
does
it shake like that after you land?" GRRRRR.
So I bought an axe handle and started chatting with neighbors here on the
airport about cutting and shaping it. I figured I'd buy a 1.125" ball cutt
er
and put a radius in it. Kept putting that off because it didn't sound like
fun.
Then it hit me: I really just need it stiffer in fore/aft flexing. And
whatever stiffener I make needs to glue to the gear leg so it needs to be a
very
good fit. Nothing fits better than fiberglass built in-place!
I decided I would tape off the gear and lay up 3 laminations of 7oz cloth
directly onto the back of the gear leg. I did that tonight, and it's curin
g.
Tomorrow I'll sand the back of that and use some flock and 5 minute epoxy t
o
attach a 1/8" thick piece of balsa wood that extends about 1.5" behind the
gear.
Once that's cured I'll lay up about 6 layers of cloth on both sides of the
balsa, overlapping onto the section that's on the gear. So the gear should
n't
end up much stiffer since it only has 1/8" thickness between the 6 layer
lamination, but it should be SUPER stiff across the 1.5" section.
So I should get that done tomorrow, and let it cure overnight. Then I'll p
op it
off the gear, trim it, and glue it onto the landing gear leg.
Any thoughts? Nick, any suggestions on the best adhesive to attach to the
gear?
Should I remove the paint or glue to the paint?
When I glue it I'll put a couple of zip ties around it to hold it while it
cures, and leave them on just in case it ever comes loose.
Fingers crossed, I can report in a few days that I have eliminated the dang
shimmy once and for all.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=372188#372188
" target=_blank saprocessedanchor="true">http://www.matronics.com/Navig
ator?Lightning-List
rocessedanchor="true">http://forums.matronics.com
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ocessedanchor="true">http://forums.matronics.com
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-= - The Lightning-List Email Forum -
-= Use the Matronics List Features Navigator to browse
-= the many List utilities such as List Un/Subscription,
-= Archive Search & Download, 7-Day Browse, Chat, FAQ,
-= Photoshare, and much much more:
-
-= --> http://www.matronics.com/Navigator?Lightning-List
-
-========================
-= - MATRONICS WEB FORUMS -
-= Same great content also available via the Web Forums!
-
-= --> http://forums.matronics.com
-
-========================
-= - List Contribution Web Site -
-= Thank you for your generous support!
-= -Matt Dralle, List Admin.
-= --> http://www.matronics.com/contribution
-========================
Message 7
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| Subject: | Re: Landing gear shimmy |
Interesting subject:
I have reduced the amount of shimmy with better tires, but have not
cured it entirely. Maybe Nick can elaborate on the reasons for the new
gear on the Lsa, as it might give us with the older gear some ideas on
things to try.
Tex,
----- Original Message -----
From: Dennis W. Wilt
To: lightning-list@matronics.com
Sent: Tuesday, May 01, 2012 9:45 AM
Subject: Re: Lightning-List: Landing gear shimmy
Clive,
I don't think I am really interested in putting this modification on
my Lightning, but the concept was interesting and I would like to see
how it is done. I have the LSA gear on my Lightning and do not have a
shimmy.
Have a wonderful day,
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: James, Clive R <clive.james@uk.bp.com>
To: lightning-list <lightning-list@matronics.com>
Sent: Tue, May 1, 2012 9:25 am
Subject: RE: Lightning-List: Landing gear shimmy
Hi Dennis, I don=99t think you could stick anything to a gear
leg that wouldn=99t come off when the leg flexed. Where wood has
been fitted before wasn=99t it held on with hose clips?
To hold the wood in place without hose clips I would have thought you
would need to =98bandage=99 it on with fibreglass tape. As
you say, good fit and glued but held all along so it has to flex with
the leg.
For sticking things to aluminium there is a primer chemical, nasty
stuff, I don=99t know what it=99s called, some kind of
chromate maybe, needs painting on and curing with heat.
Interestingly I have Lighting gear legs on my Esqual but no shimmy,
even with the great big RV spats (which I took off, anyone want to buy
them?). Different wheels and brake discs though.
Just about to fit 6 ply tyres so maybe that will change :(
Good luck, regards, Clive
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of Dennis
W. Wilt
Sent: 01 May 2012 13:29
To: lightning-list@matronics.com
Subject: Re: Lightning-List: Landing gear shimmy
It would be nice to see some pictures of the stiffener as you built it
and as you complete the installation.
Dennis
N616DW (Arion Lightning S/N 132)
-----Original Message-----
From: Bill Strahan <bill@gdsx.com>
To: lightning-list <lightning-list@matronics.com>
Sent: Tue, May 1, 2012 1:37 am
Subject: Lightning-List: Landing gear shimmy
Hey, I've talked about this before, haven't I? I've had 3 big changes I
wanted to make for a long time: 1) Fix fuel distribution issue. 2)
Make some short wingtips. 3) Eliminate the landing gear shimmy. I
installed the flow straightener tube and vanes that Nick sent me about a
year ago. That did an amazing job. Perfect? No. Good enough that I'm
not considering installing fuel injection? Yep. So #1 is adressed. I
still need to make short wingtips, but my passenger yesterday asked "Why
does it shake like that after you land?" GRRRRR. So I bought an axe
handle and started chatting with neighbors here on the airport about
cutting and shaping it. I figured I'd buy a 1.125" ball cutter and put
a radius in it. Kept putting that off because it didn't sound like fun.
Then it hit me: I really just need it stiffer in fore/aft flexing. And
whatever stiffener I make needs to glue to the gear leg so it needs to
be a very good fit. Nothing fits better than fiberglass built in-place!
I decided I would tape off the gear and lay up 3 laminations of 7oz
cloth directly onto the back of the gear leg. I did that tonight, and
it's curing. Tomorrow I'll sand the back of that and use some flock and
5 minute epoxy to attach a 1/8" thick piece of balsa wood that extends
about 1.5" behind the gear. Once that's cured I'll lay up about 6
layers of cloth on both sides of the balsa, overlapping onto the section
that's on the gear. So the gear shouldn't end up much stiffer since it
only has 1/8" thickness between the 6 layer lamination, but it should be
SUPER stiff across the 1.5" section. So I should get that done tomorrow,
and let it cure overnight. Then I'll pop it off the gear, trim it, and
glue it onto the landing gear leg. Any thoughts? Nick, any suggestions
on the best adhesive to attach to the gear? Should I remove the paint
or glue to the paint? When I glue it I'll put a couple of zip ties
around it to hold it while it cures, and leave them on just in case it
ever comes loose. Fingers crossed, I can report in a few days that I
have eliminated the dang shimmy once and for all. Read this topic
online here: http://forums.matronics.com/viewtopic.php?p=372188#372188
" target=_blank
saprocessedanchor="true">http://www.matronics.com/Navigator?Lightning-L
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Message 8
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| Subject: | Re: Landing gear shimmy |
The way I would do it would be to clean thoroughly the bare aluminum gear l
eg, then wrap two layers of 3" wide glass cloth on the gear, in a spiral ma
nner. After cured, sand the rear of the glass and flox/epoxy a shaped pine
wood (or similar wood) shape to the rear. I would then wrap the gear and fa
iring with another three layers of glass cloth. You could then attach the f
actory fairings over that or finish the glass cloth. Heck, even better woul
d be to do it to all three gear legs. (Or maybe you may not have any shimmy
problems at all with the standard setup).
Bernardo
--- On Tue, 5/1/12, Bill Strahan <bill@gdsx.com> wrote:
From: Bill Strahan <bill@gdsx.com>
Subject: Lightning-List: Landing gear shimmy
Hey, I've talked about this before, haven't I?- I've had 3 big changes I
wanted to make for a long time:- 1)- Fix fuel distribution issue.- 2)
- Make some short wingtips.- 3)- Eliminate the landing gear shimmy.
I installed the flow straightener tube and vanes that Nick sent me about a
year ago.- That did an amazing job.- Perfect?- No.- Good enough tha
t I'm not considering installing fuel injection?- Yep.- So #1 is adress
ed.
I still need to make short wingtips, but my passenger yesterday asked "Why
does it shake like that after you land?"---GRRRRR.
So I bought an axe handle and started chatting with neighbors here on the a
irport about cutting and shaping it.- I figured I'd buy a 1.125" ball cut
ter and put a radius in it.- Kept putting that off because it didn't soun
d like fun.
Then it hit me:- I really just need it stiffer in fore/aft flexing.- An
d whatever stiffener I make needs to glue to the gear leg so it needs to be
a very good fit.- Nothing fits better than fiberglass built in-place!
I decided I would tape off the gear and lay up 3 laminations of 7oz cloth d
irectly onto the back of the gear leg.- I did that tonight, and it's curi
ng.- Tomorrow I'll sand the back of that and use some flock and 5 minute
epoxy to attach a 1/8" thick piece of balsa wood that extends about 1.5" be
hind the gear.- Once that's cured I'll lay up about 6 layers of cloth on
both sides of the balsa, overlapping onto the section that's on the gear.
- So the gear shouldn't end up much stiffer since it only has 1/8" thickn
ess between the 6 layer lamination, but it should be SUPER stiff across the
1.5" section.
So I should get that done tomorrow, and let it cure overnight.- Then I'll
pop it off the gear, trim it, and glue it onto the landing gear leg.
Any thoughts?- Nick, any suggestions on the best adhesive to attach to th
e gear?- Should I remove the paint or glue to the paint?
When I glue it I'll put a couple of zip ties around it to hold it while it
cures, and leave them on just in case it ever comes loose.
Fingers crossed, I can report in a few days that I have eliminated the dang
shimmy once and for all.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=372188#372188
le, List Admin.
Message 9
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| Subject: | Re: Landing gear shimmy |
Here are a few pictures.
Attachment5, the 3 layers on the landing gear (covered in tape) before I pried
it off this morning.
Attachment8, the half-tube of fiberglass once it was pried off.
Attachment7, I went with 1/16" X 1" bass instead of 1/8" balsa, attached with 5
minute.
Attachment6, a shot down the length of the tube. Once I've laid up several layers
on both sides and trimmed it, it should flex okay in one direction, and be
super stiff going against the 1" length of bass/fiberglass.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=372228#372228
Attachments:
http://forums.matronics.com//files/attachment8_130.jpg
http://forums.matronics.com//files/attachment7_195.jpg
http://forums.matronics.com//files/attachment6_375.jpg
http://forums.matronics.com//files/attachment5_261.jpg
Message 10
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| Subject: | Re: Landing gear shimmy |
Okay, the stiffeners are built. I'm waiting on an adhesive test I did to choose
which adhesive I use to bond them to the back of the gear legs.
FWIW, they're stiff. I can barely flex them in the direction the landing gear
SHOULD flex, and they won't budge in the other axis. Makes sense. Hopefully
they're not TOO stiff. Somewhere in there is a joke about being 18 again, but
I'll skip it. :)
Here are two pictures.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=372239#372239
Attachments:
http://forums.matronics.com//files/stiffener_attached_717.jpg
http://forums.matronics.com//files/stiffener_181.jpg
Message 11
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| Subject: | Official Lightning-List FAQ (Frequently Asked Questions) |
Dear Listers,
Please read over the Lightning-List Frequently Asked Questions (FAQ) below. The
complete Lightning-List FAQ including the Usage Guidelines can be found at the
following URL:
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Thank you,
Matt Dralle
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- Please keep all posts related to the List at some level. Do not submit
posts concerning computer viruses, urban legends, random humor, long
lost buddies' phone numbers, etc. etc.
- THINK carefully before you write. Ask yourself if your post will be
relevant to everyone. If you have to wonder about that, DON'T send it.
- Remember that your post will be included for posterity in an archive
that is growing in size at an extraordinary rate. Try to be concise and
terse in your posts. Avoid overly wordy and lengthy posts and
responses.
- Keep your signature brief. Please include your name, email address,
aircraft type/tail number, and geographic location. A short line
about where you are in the building process is also nice. Avoid
bulky signatures with character graphics; they consume unnecessary
space in the archive.
- DON'T post requests to the List for information when that info is
easily obtainable from other widely available sources. Consult the
web page or FAQ first.
- If you want to respond to a post, DO keep the "Subject:" line of
your response the same as that of the original post. This makes it
easy to find threads in the archive.
- When responding, NEVER quote the *entire* original post in your
response. DO use lines from the original post to help "tune in" the
reader to the topic at hand, but be selective. The impact that
quoting the entire original post has on the size of the archive
can not be overstated!
- When the poster asks you to respond to him/her personally, DO NOT
then go ahead and reply to the List. Be aware that clicking the
"reply" button on your mail package does not necessarily send your
response to the original poster. You might have to actively address
your response with the original poster's email address.
- DO NOT use the List to respond to a post unless you have something
to add that is relevant and has a broad appeal. "Way to go!", "I
agree", and "Congratulations" are all responses that are better sent
to the original poster directly, rather than to the List at large.
- When responding to others' posts, avoid the feeling that you need to
comment on every last point in their posts, unless you can truly
contribute something valuable.
- Feel free to disagree with other viewpoints, BUT keep your tone
polite and respectful. Don't make snide comments, personally attack
other listers, or take the moral high ground on an obviously
controversial issue. This will only cause a pointless debate that
will hurt feelings, waste bandwidth and resolve nothing.
- Occasional posts by vendors or individuals who are regularly
subscribed to a given List are considered acceptable. Posts by
List members promoting their respective products or items for sale
should be of a friendly, informal nature, and should not resemble
a typical SPAM message. The List isn't about commercialism, but
is about sharing information and knowledge. This applies to
everyone, including those who provide products to the entire
community. Informal presentation and moderation should be the
operatives with respect to advertising on the Lists.
-------
[This is an automated posting.]
do not archive
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| Subject: | Official Lightning-List Usage Guidelines |
Dear Listers,
Please read over the Lightning-List Usage Guidelines below. The complete
Lightning-List FAQ including these Usage Guidelines can be found at the
following URL:
http://www.matronics.com/FAQs/Lightning-List.FAQ.html
Thank you,
Matt Dralle
Matronics Email List Administrator
******************************************************************************
Lightning-List Usage Guidelines
******************************************************************************
The following details the official Usage Guidelines for the Lightning-List.
You are encouraged to read it carefully, and to abide by the rules therein.
Failure to use the Lightning-List in the manner described below may result
in the removal of the subscribers from the List.
Lightning-List Policy Statement
The purpose of the Lightning-List is to provide a forum of discussion for
things related to this particular discussion group. The List's goals
are to serve as an information resource to its members; to deliver
high-quality content; to provide moral support; to foster camaraderie
among its members; and to support safe operation. Reaching these goals
requires the participation and cooperation of each and every member of
the List. To this end, the following guidelines have been established:
- Please keep all posts related to the List at some level. Do not submit
posts concerning computer viruses, urban legends, random humor, long
lost buddies' phone numbers, etc. etc.
- THINK carefully before you write. Ask yourself if your post will be
relevant to everyone. If you have to wonder about that, DON'T send it.
- Remember that your post will be included for posterity in an archive
that is growing in size at an extraordinary rate. Try to be concise and
terse in your posts. Avoid overly wordy and lengthy posts and
responses.
- Keep your signature brief. Please include your name, email address,
aircraft type/tail number, and geographic location. A short line
about where you are in the building process is also nice. Avoid
bulky signatures with character graphics; they consume unnecessary
space in the archive.
- DON'T post requests to the List for information when that info is
easily obtainable from other widely available sources. Consult the
web page or FAQ first.
- If you want to respond to a post, DO keep the "Subject:" line of
your response the same as that of the original post. This makes it
easy to find threads in the archive.
- When responding, NEVER quote the *entire* original post in your
response. DO use lines from the original post to help "tune in" the
reader to the topic at hand, but be selective. The impact that
quoting the entire original post has on the size of the archive
can not be overstated!
- When the poster asks you to respond to him/her personally, DO NOT
then go ahead and reply to the List. Be aware that clicking the
"reply" button on your mail package does not necessarily send your
response to the original poster. You might have to actively address
your response with the original poster's email address.
- DO NOT use the List to respond to a post unless you have something
to add that is relevant and has a broad appeal. "Way to go!", "I
agree", and "Congratulations" are all responses that are better sent
to the original poster directly, rather than to the List at large.
- When responding to others' posts, avoid the feeling that you need to
comment on every last point in their posts, unless you can truly
contribute something valuable.
- Feel free to disagree with other viewpoints, BUT keep your tone
polite and respectful. Don't make snide comments, personally attack
other listers, or take the moral high ground on an obviously
controversial issue. This will only cause a pointless debate that
will hurt feelings, waste bandwidth and resolve nothing.
- Occasional posts by vendors or individuals who are regularly
subscribed to a given List are considered acceptable. Posts by
List members promoting their respective products or items for sale
should be of a friendly, informal nature, and should not resemble
a typical SPAM message. The List isn't about commercialism, but
is about sharing information and knowledge. This applies to
everyone, including those who provide products to the entire
community. Informal presentation and moderation should be the
operatives with respect to advertising on the Lists.
-------
[This is an automated posting.]
do not archive
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