Laminating an aileron spar

[Michael Horowitz]

I need to add about 1/4" strip to the edge of my newly purchased
spruce aileron spar, 'cause I need to add a bevel. The spar is 3" wide
so the proposed strip is only a fraction of the area.

Can anyone see a problem if I used fir instead of spruce for this
strip? Fir is more easily available locally - Mike

[cavelamb himself]

Michael Horowitz wrote:

> I need to add about 1/4" strip to the edge of my newly purchased
> spruce aileron spar, 'cause I need to add a bevel. The spar is 3" wide
> so the proposed strip is only a fraction of the area.
>
> Can anyone see a problem if I used fir instead of spruce for this
> strip? Fir is more easily available locally - Mike

Mike?

You need to add a 1/4" strip - that is going to be mostly beveled off?

This is a trick question, right?

What would it matter what you used for this??


Richard

[jerry wass]

cavelamb himself wrote:
> Michael Horowitz wrote:
>
>> I need to add about 1/4" strip to the edge of my newly purchased
>> spruce aileron spar, 'cause I need to add a bevel. The spar is 3" wide
>> so the proposed strip is only a fraction of the area.
>>
>> Can anyone see a problem if I used fir instead of spruce for this
>> strip? Fir is more easily available locally - Mike
>
> Mike?
>
> You need to add a 1/4" strip - that is going to be mostly beveled off?
>
> This is a trick question, right?
>
> What would it matter what you used for this??
>
>
> Richard


I'd glue it on real good--don't depend on tacks or staples--jerry

[Morgans[_2_]]

"Jerry Wass"> wrote

> I'd glue it on real good--don't depend on tacks or staples--jerry

Yeah, you wouldn't want it to be "tacky." <g>
--
Jim in NC

[Michael Horowitz]

On Tue, 27 Mar 2007 03:29:49 GMT, cavelamb himself
> wrote:

>Michael Horowitz wrote:
>
>> I need to add about 1/4" strip to the edge of my newly purchased
>> spruce aileron spar, 'cause I need to add a bevel. The spar is 3" wide
>> so the proposed strip is only a fraction of the area.
>>
>> Can anyone see a problem if I used fir instead of spruce for this
>> strip? Fir is more easily available locally - Mike
>
>Mike?
>
>You need to add a 1/4" strip - that is going to be mostly beveled off?
>
>This is a trick question, right?
>
>What would it matter what you used for this??
>
>
>Richard


Richard - thanks for the reply. I am concerned about two things;
because pine (for example) has a different density than spruce, they
might react differently to humidity or temp change and affect the
straightness of the spar. Second; some A&P looking at it and reject
the repair.

Granted, the amount is so small, I'm probably worried about nothing,
but being part of the USG, I"ve seen minor things become bent way out
of shape just because someone got their teeth into it. - Mike

Do you think I'm being unreasonable?

[cavelamb himself]

Michael Horowitz wrote:
> On Tue, 27 Mar 2007 03:29:49 GMT, cavelamb himself
> > wrote:
>
>
>>Michael Horowitz wrote:
>>
>>
>>>I need to add about 1/4" strip to the edge of my newly purchased
>>>spruce aileron spar, 'cause I need to add a bevel. The spar is 3" wide
>>>so the proposed strip is only a fraction of the area.
>>>
>>>Can anyone see a problem if I used fir instead of spruce for this
>>>strip? Fir is more easily available locally - Mike
>>
>>Mike?
>>
>>You need to add a 1/4" strip - that is going to be mostly beveled off?
>>
>>This is a trick question, right?
>>
>>What would it matter what you used for this??
>>
>>
>>Richard
>
>
>
> Richard - thanks for the reply. I am concerned about two things;
> because pine (for example) has a different density than spruce, they
> might react differently to humidity or temp change and affect the
> straightness of the spar. Second; some A&P looking at it and reject
> the repair.
>
> Granted, the amount is so small, I'm probably worried about nothing,
> but being part of the USG, I"ve seen minor things become bent way out
> of shape just because someone got their teeth into it. - Mike
>
> Do you think I'm being unreasonable?

Probably, but that's ok.

Like Jerry said, glue it on. (With a good epoxy - I'd use T-88)
The strip is so small it shouldn't cause any problems.

Richard

[COLIN LAMB]

"I am concerned about two things; because pine (for example) has a different
density than spruce, they might react differently to humidity or temp change
and affect the straightness of the spar."

I do not think the difference in density will be the problem. A thin piece
of dried wood, when attached to a larger piece of wood will continue to
adapt to the shape of the larger piece of wood. The larger spruce would not
be any more likely to warp - but for the fact that one side is now protected
from the moisture - and that would occur no matter what kind of wood you
use.

The completed piece should be no more likely to warp than the original
piece.

As to the second part of the concern - about the inspection - ask the
inspector in advance. Remember, it is experimental.

Colin

[mhorowit]

COLIN LAMB wrote:
> "I am concerned about two things; because pine (for example) has a different
> density than spruce, they might react differently to humidity or temp change
> and affect the straightness of the spar."
>
> I do not think the difference in density will be the problem. A thin piece
> of dried wood, when attached to a larger piece of wood will continue to
> adapt to the shape of the larger piece of wood. The larger spruce would not
> be any more likely to warp - but for the fact that one side is now protected
> from the moisture - and that would occur no matter what kind of wood you
> use.
>
> The completed piece should be no more likely to warp than the original
> piece.
>
> As to the second part of the concern - about the inspection - ask the
> inspector in advance. Remember, it is experimental.
>
> Colin

[mhorowit]

COLIN LAMB wrote:
Remember, it is experimental.
>
> Colin

Nope: certified

[Michael Horowitz]

On 27 Mar 2007 07:36:25 -0700, "mhorowit" > wrote:

>
>COLIN LAMB wrote:
> Remember, it is experimental.
>>
>> Colin
>
>Nope: certified


My A&P wants spruce or fir, so fir it will be
Thanks to all - MIke

[jls]

"Michael Horowitz" > wrote in message
...
> On 27 Mar 2007 07:36:25 -0700, "mhorowit" > wrote:
>
> >
> >COLIN LAMB wrote:
> > Remember, it is experimental.
> >>
> >> Colin
> >
> >Nope: certified
>
>
> My A&P wants spruce or fir, so fir it will be
> Thanks to all - MIke

When they were building Taylorcrafts in Alliance and wherever else
they built them, the wood for the ailerons was kinda like leftovers.

I just looked at a couple of original laminated aileron spars from the
1940's. The laminations were along their height, not their thickness.

It's amazing that after all these years the Taylorcraft spars, all
Sitka spruce so far as I know, don't have any AD's. Neither do their
struts. Matter of fact Taylorcrafts have very few AD's. My A&P, C.
M. Owenby, who is now sacred to the memories in these parts, always
said the Taylorcrafts were built like trucks. And yet they were light
and capable of carrying wondrous loads.

[Michael Horowitz]

On Tue, 27 Mar 2007 19:27:50 -0500, " jls" >
wrote:

>
>"Michael Horowitz" > wrote in message
...
>> On 27 Mar 2007 07:36:25 -0700, "mhorowit" > wrote:
>>
>> >
>> >COLIN LAMB wrote:
>> > Remember, it is experimental.
>> >>
>> >> Colin
>> >
>> >Nope: certified
>>
>>
>> My A&P wants spruce or fir, so fir it will be
>> Thanks to all - MIke
>
>When they were building Taylorcrafts in Alliance and wherever else
>they built them, the wood for the ailerons was kinda like leftovers.
>
>I just looked at a couple of original laminated aileron spars from the
>1940's. The laminations were along their height, not their thickness.
>
>It's amazing that after all these years the Taylorcraft spars, all
>Sitka spruce so far as I know, don't have any AD's. Neither do their
>struts. Matter of fact Taylorcrafts have very few AD's. My A&P, C.
>M. Owenby, who is now sacred to the memories in these parts, always
>said the Taylorcrafts were built like trucks. And yet they were light
>and capable of carrying wondrous loads.
>

I am constantly impressed by what I am seeing and learning as I go
thru this experience - Mike

[cavelamb himself]

jls wrote:
> "Michael Horowitz" > wrote in message
> ...
>
>>On 27 Mar 2007 07:36:25 -0700, "mhorowit" > wrote:
>>
>>
>>>COLIN LAMB wrote:
>>>Remember, it is experimental.
>>>
>>>>Colin
>>>
>>>Nope: certified
>>
>>
>>My A&P wants spruce or fir, so fir it will be
>>Thanks to all - MIke
>
>
> When they were building Taylorcrafts in Alliance and wherever else
> they built them, the wood for the ailerons was kinda like leftovers.
>
> I just looked at a couple of original laminated aileron spars from the
> 1940's. The laminations were along their height, not their thickness.
>
> It's amazing that after all these years the Taylorcraft spars, all
> Sitka spruce so far as I know, don't have any AD's. Neither do their
> struts. Matter of fact Taylorcrafts have very few AD's. My A&P, C.
> M. Owenby, who is now sacred to the memories in these parts, always
> said the Taylorcrafts were built like trucks. And yet they were light
> and capable of carrying wondrous loads.
>
>

I (heart) T-Carts!