Bob H
Joined: 01 Dec 2006
Posts: 43
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 Posted: Sat Aug 18, 2012 10:21 am Post subject: Pulsar-List Digest: 9 Msgs - 08/17/12 |
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Wrapping with carbon provides higher torsional and bending stiffness than
just a glass wrap of equivalent thickness; on the order of 3-4X stiffer. So
for best efficiency, use carbon wrap.
For the bearing situation of glass composite at gear attachment, glass has
low bearing strength (35,000 psi) compared to alum (80,000 psi), so easiest
way to increase bearing is to apply more localized glass to thicken section
or make steel inserts that bond into enlarged attachment holes. Inserts
would be on the order of 3/8"OD with 1/4" ID and good to have a flanged
surface for bond area.
Bob H
[quote] From: Pulsar-List Digest Server <pulsar-list(at)matronics.com>
Reply-To: <pulsar-list(at)matronics.com>
Date: Fri, 17 Aug 2012 23:58:06 -0700
To: Pulsar-List Digest List <pulsar-list-digest(at)matronics.com>
Subject: Pulsar-List Digest: 9 Msgs - 08/17/12
*
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Pulsar-List Digest Archive
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Total Messages Posted Fri 08/17/12: 9
----------------------------------------------------------
Today's Message Index:
----------------------
1. 01:05 AM - Fiberglass/ foam undercarriage age. (mjb777)
2. 02:43 AM - Re: Fiberglass/ foam undercarriage age.
(pulsar331(at)sbcglobal.net)
3. 03:03 AM - Re: Fiberglass/ foam undercarriage age. (Scott - Special
Effects Armourer)
4. 06:58 AM - Re: Fiberglass/ foam undercarriage age. (Bernard Wilder)
5. 07:34 AM - Re: Fiberglass/ foam undercarriage age. (Keith Palmer)
6. 09:14 AM - Re: Fiberglass/ foam undercarriage age. (Scott - Special
Effects Armourer)
7. 09:14 AM - Re: Fiberglass/ foam undercarriage age. (Scott - Special
Effects Armourer)
8. 09:35 AM - Re: Fiberglass/ foam undercarriage age. (Ray Wilhelm)
9. 01:28 PM - Re: Wheel pants (Larry Eubanks)
________________________________ Message 1
_____________________________________
Time: 01:05:08 AM PST US
Subject: Fiberglass/ foam undercarriage age.
From: "mjb777" <mattbrock777(at)gmail.com>
Hi guys,
Time for a new question.
My Pulsar 1 tail dragger kit has the original composite main gear.
It looks to be in good condition, however I wonder if there have been any
modifications
required, or issues with these in service?
Are there still many Pulsars out there flying with the original composite main
gear?
Matt.
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=381056#381056
________________________________ Message 2
_____________________________________
Time: 02:43:35 AM PST US
Subject: Re: Fiberglass/ foam undercarriage age.
From: pulsar331(at)sbcglobal.net
Some of us added a wrap of fiberglass or carbon fiber around the lower part of
the leg. I used carbon fiber - about 1/2" wide wrapped around the very end of
the leg and another just above the where the axle mounts. There were small
cracks
developing and the wraps stopped that. That was 10 years ago - no more
problems
with that area. However, I have also had problems with the bolt holes
wearing where the gear mounts to the seat back and to the gusset. Once the
holes
are worn you get a popping sound when turning. I have not come up with a good
permanent fix for that yet. So far I just keep them tight, but a repair in
that area is in the future.
Bill Coleman
Pulsar XP N331BP
On Aug 17, 2012, at 4:04 AM, "mjb777" <mattbrock777(at)gmail.com> wrote:
>
> Hi guys,
>
> Time for a new question.
>
> My Pulsar 1 tail dragger kit has the original composite main gear.
>
> It looks to be in good condition, however I wonder if there have been any
> modifications
required, or issues with these in service?
>
> Are there still many Pulsars out there flying with the original composite
> main
gear?
>
> Matt.
>
> --------
> Pulsar 1 TD Kit.
> Captain B777.
> Licenced Aircraft Maintenance Engineer.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=381056#381056
>
>
>
>
>
>
>
>
>
>
________________________________ Message 3
_____________________________________
Time: 03:03:29 AM PST US
From: Scott - Special Effects Armourer <scott(at)s-f-x.com>
Subject: Re: Fiberglass/ foam undercarriage age.
My gear is composite - 20 years old and was not reinforced. It broke during a
soft
landing so I chose a repair which has taken 4 months and cost a fortune
(insurance
claim). I should have gone for the alu leg from Grove. They made a special
for lighter models. Mine is 1060lbs MTOW.
Cheers
Scott MacIntyre
On 17 Aug 2012, at 10:42, pulsar331(at)sbcglobal.net wrote:
>
> Some of us added a wrap of fiberglass or carbon fiber around the lower part
> of
the leg. I used carbon fiber - about 1/2" wide wrapped around the very end
of the leg and another just above the where the axle mounts. There were small
cracks developing and the wraps stopped that. That was 10 years ago - no more
problems with that area. However, I have also had problems with the bolt
holes
wearing where the gear mounts to the seat back and to the gusset. Once the
holes
are worn you get a popping sound when turning. I have not come up with a
good permanent fix for that yet. So far I just keep them tight, but a repair
in
that area is in the future.
>
> Bill Coleman
> Pulsar XP N331BP
>
>
>
>
>
> On Aug 17, 2012, at 4:04 AM, "mjb777" <mattbrock777(at)gmail.com> wrote:
>
>>
>> Hi guys,
>>
>> Time for a new question.
>>
>> My Pulsar 1 tail dragger kit has the original composite main gear.
>>
>> It looks to be in good condition, however I wonder if there have been any
>> modifications
required, or issues with these in service?
>>
>> Are there still many Pulsars out there flying with the original composite
>> main
gear?
>>
>> Matt.
>>
>> --------
>> Pulsar 1 TD Kit.
>> Captain B777.
>> Licenced Aircraft Maintenance Engineer.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=381056#381056
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
________________________________ Message 4
_____________________________________
Time: 06:58:26 AM PST US
Subject: Re: Fiberglass/ foam undercarriage age.
From: Bernard Wilder <bernard.wilder2(at)gmail.com>
Kit #390 after twelve years is still flying with the original foam filled
composite gear. It has seen about 1,500 smooth landings and 500 teeth
jarers. (( give or take a few.))
About eight years ago a crack developed that ran two inches up from the
very bottom on one side. The wheel mounting plate places two mounting bolts
either side of the crack. that keeps the crack from spreading open.. The
crack has never gone any farther up the gear so I didn't do anything about
it and have long since stopped worrying about it.
After twelve years the gear has developed a little permanent spread. The
wheels no longer sit exactly straight up and down. Close but not exactly.
HEY - - - - we all develop a little spread with age. I expect to go on for
a few more years and I expect my gear to do the same.
Bernie Wilder
On Fri, Aug 17, 2012 at 4:04 AM, mjb777 <mattbrock777(at)gmail.com> wrote:
>
> Hi guys,
>
> Time for a new question.
>
> My Pulsar 1 tail dragger kit has the original composite main gear.
>
> It looks to be in good condition, however I wonder if there have been any
> modifications required, or issues with these in service?
>
> Are there still many Pulsars out there flying with the original composite
> main gear?
>
> Matt.
>
> --------
> Pulsar 1 TD Kit.
> Captain B777.
> Licenced Aircraft Maintenance Engineer.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=381056#381056
>
>
________________________________ Message 5
_____________________________________
Time: 07:34:35 AM PST US
From: "Keith Palmer" <kdpalmer(at)mweb.co.za>
Subject: Re: Fiberglass/ foam undercarriage age.
The very early main gears had problems and a heavier core ? was used which
improved the gear. Later a mod came out because of splitting at the bolt
holes for the slub axles, this envolved wrapping carbon fibre around the
lower 5 or 6" where the bolts went through to stop the splitting. ( for
Bernard )
K'd
---
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