ULF-1
ULF-1 Discussion Archive
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Re: [ULF-1] Help to find GL1 Plywood

From
Member 122
Date
2018-06-21 12:45 UTC-05:00
Message
#0637
Hello Member 67,

Were you able to obtain 0.6 mm plywood from Aircraft Spruce?   On
their website the minimum thickness plywood I see is 0.8.

Regards,
Member 122

On 5/21/18, Member 72 <[email]> wrote:
> Hi Nuno,
>
> Here in the States we have Aircraft Spruce which provided all our Finnish
> Birch aircraft quality plywood, rolled up in 4’ x 4’ sheets and shipped to
> us.  I think there might be a European Aircraft Spruce distributor, but not
> sure.
>
> Good luck in finding it!
>
> Member 72
>
> Sent from my iPhone
>
>> On May 21, 2018, at 4:39 PM, Member 117 <[email]> wrote:
>>
>> Hi to all.
>>
>> I start looking for Plywood GL1 for start my ULF-1 project, but its hard
>> to find.
>>
>> In same forums some user said the designation GL1 its no longer available
>> since 2012, and the new designation is AB/B, this is true? in my mind this
>> type off classification normally its for maritime plywood.
>>
>> I need help too understand, where i can find the correct birch plywood for
>> my project in Europe preferably.
>>
>> I try to look for in Portugal is a waste of time, nobody gives me GL1.
>>
>> Thank you for your help.
>>
>> best regards for all from Portugal
>>
>> Member 117
>>
>>> No dia [phone], às 22:03, [email] escreveu:
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>>>  1. ULF-1 spar destructive test (Member 117)
>>>  2. Re: ULF-1 spar destructive test (Member 72)
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>>> ----------------------------------------------------------------------
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>>> Message: 1
>>> Date: Wed, 2 May 2018 14:54:25 +0100
>>> From: Member 117 <[email]>
>>> To: [email]
>>> Subject: [ULF-1] ULF-1 spar destructive test
>>> Message-ID: <[email]>
>>> Content-Type: text/plain; charset="us-ascii"
>>>
>>> Good afternoon
>>>
>>> I am preparing all the materials to begin the construction of a ULF-1 in
>>> Portugal, and I saw on the web, that the EAA Chapter 309 in North
>>> Carolina performed a  ULF-1 Spar destructive test, it is possible to have
>>> access to these data? and if the construction of the spar was carried out
>>> according to the instructions in the manual ?
>>>
>>> thank you
>>>
>>> Best regards,
>>>
>>> Member 117
>>>
>>>
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>>> Message: 2
>>> Date: Wed, 2 May 2018 17:00:29 -0400
>>> From: Member 72 <[email]>
>>> To: [email]
>>> Subject: Re: [ULF-1] ULF-1 spar destructive test
>>> Message-ID: <[email]>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Hi Nuno,
>>>
>>> Good luck with your
>>> Build!  We deviated from the plans with the attachment fittings at the
>>> wing roots.  The plans call for tubular rivets to be used to attach the
>>> steel fittings to the spar caps.  We did not have the tooling to
>>> fabricate these large rivets.  So, at each station that required a rivet,
>>> we drilled a 1/2? hole and epoxied a nylon lug or bushing into the hole.
>>> The nylon lugs have a 1/4? hole drilled down the center to accept an AN-4
>>> aviation bolt.  We epoxied the steel spar fittings on, with their 1/4?
>>> holes pre-drilled to match the holes on the nylon lugs.  Then, we added
>>> the bolts, washers and nuts.  We were in contact with Member 9, the
>>> designer, at Aero in Germany.  Because of our deviation to his plans on
>>> the most heavily loaded part of the airframe, he asked us to perform a
>>> destruction test and gave us a minimum breaking strength.  Fortunately we
>>> were well over his minimum figure, and he blessed our design deviation!
>>> If we were to do it again, we would consider using 1/2? phenoli
>>> c rod rather than the nylon.  But, the nylon lug material worked OK.
>>>
>>> Best regards,
>>> Member 72
>>>
>>>
>>>
>>> Sent from my iPhone
>>>
>>>> On May 2, 2018, at 9:54 AM, Member 117 <[email]>
>>>> wrote:
>>>>
>>>> Good afternoon
>>>>
>>>> I am preparing all the materials to begin the construction of a ULF-1 in
>>>> Portugal, and I saw on the web, that the EAA Chapter 309 in North
>>>> Carolina performed a  ULF-1 Spar destructive test, it is possible to
>>>> have access to these data? and if the construction of the spar was
>>>> carried out according to the instructions in the manual ?
>>>>
>>>> thank you
>>>>
>>>> Best regards,
>>>>
>>>> Member 117
>>>>
>>>>
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