Fairchild Club Forum

'Could you please elaborate on ....a problem waiting to happen? Thanks.

David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 under construction
and on the gear...

----- Original Message -----
From: ranger440c5
To: fairchildclub@yahoogroups.com
Sent: Wednesday, April 25, 2007 4:39 PM
Subject: [fairchildclub] Re: Covering our Baby


Hasn't been mentioned yet....watch the fabric weight (whoever supplies
it)many oddities await if not addressed. Doesn't matter if the coatings
are waterborne, urethane, vinyl, or dope....the polyester fabric is a
problem waiting to happen.






------------------------------------------------------------------------------


No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.463 / Virus Database: 269.6.0/775 - Release Date: 4/24/07 5:43 PM


[Non-text portions of this message have been removed]

'

'Greeting everyone who responded to our question. Would like to thank you each personally, but hope the general email will suffice. I am really curious, as well, about "a problem waiting to happen". Are you saying that polyester is not the covering of choice? Thanks for raising the question. Bob

david stroud wrote: Could you please elaborate on ....a problem waiting to happen? Thanks.

David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 under construction
and on the gear...

----- Original Message -----
From: ranger440c5
To: fairchildclub@yahoogroups.com
Sent: Wednesday, April 25, 2007 4:39 PM
Subject: [fairchildclub] Re: Covering our Baby

Hasn't been mentioned yet....watch the fabric weight (whoever supplies
it)many oddities await if not addressed. Doesn't matter if the coatings
are waterborne, urethane, vinyl, or dope....the polyester fabric is a
problem waiting to happen.

----------------------------------------------------------

No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.463 / Virus Database: 269.6.0/775 - Release Date: 4/24/07 5:43 PM

[Non-text portions of this message have been removed]






[Non-text portions of this message have been removed]

'

'The "problems" are more aesthetic than functional(I hope!). When
applying 3.4oz material with blanket method, it is VERY, VERY, VERY,
easy to have the cover lying( or very nearly so) on the rear spar.
This troughing once noticed, is very annoying. It does beg the
question...How does this now thinner airfoil affect performance?
Won't this thinner wing have some different lift characteristics? I
don't know, but that airfoil is not like what it looked like when it
left the factory in cotton. 2.7OZ seems less prone to this issue,
but can be made to trough sustantially more that materials of yore.
I KNOW Ceconite 101 of 30 years ago wouldn't trough this severely.
There are Citabrias around with the rear spars poking thru and the
trough is so deep at the airfoil apex you can cast an echo in it! I
recently recovered an original '66 Citabria that had it's original
fabric. It wasn't even a third of the trough depth of many nice shiny
wet look recently covered Citabrias I've seen. Once brought to one's
attention, it now becomes an eyesore and many folks never enev knew
there was a "problem". Is it then? You be the judge.
Select the weight of your material carefully or experiment with
choices.



--- In fairchildclub@yahoogroups.com, "david stroud"
wrote:

>
> Could you please elaborate on ....a problem waiting to happen?

Thanks.

>
> David Stroud Ottawa, Canada
> C-FDWS Christavia
> Fairchild 51 under construction
> and on the gear...
>
> ----- Original Message -----
> From: ranger440c5
> To: fairchildclub@yahoogroups.com
> Sent: Wednesday, April 25, 2007 4:39 PM
> Subject: [fairchildclub] Re: Covering our Baby
>
>
> Hasn't been mentioned yet....watch the fabric weight (whoever

supplies

> it)many oddities await if not addressed. Doesn't matter if the

coatings

> are waterborne, urethane, vinyl, or dope....the polyester fabric

is a

> problem waiting to happen.
>
>
>
>
>
>
> --------------------------------------------------------------------

----------

>
>
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.463 / Virus Database: 269.6.0/775 - Release Date:

4/24/07 5:43 PM

>
>
> [Non-text portions of this message have been removed]
>

'

'This troughing will not happen if you are careful to lift the fabric away from any place it has unintentionally adhered. It is a simple matter of inspecting the job closely after the brush coat of Poly-Brush has dried, and lifting the troughs by sticking a needle in the fabric and prying it up. The hole the needle will make will self-heal with a little heat, which will soften the Poly-Brush and allow the fibers to move back into alignment.

[Non-text portions of this message have been removed]'

'No, you missed the point. As stated earlier, it matters not what
system...
Polyfiber or dope or 3 step urethane or waterborne.....it is during
heat tautening, before ANY top coats/sealers applied. The currently
available 101 (3.4oz)
material has a great propesity toward assymetrical
shrinkage....vastly
more aggressive across the roll than lengthwise. Predicting it to
allow
for this while at the same time not too slack to avoid ballooning is
nigh on impossible (certainly beyond 1st timers). And once again,
2.7oz
SEEMS to be less susceptible to this condition. It has nothing to due
with the fabric being "stuck" to underlying structure. I am making a
distinction of a great difference in shrinkage behavior of 3.4oz and
2.7oz. You will notice the far heavier promotion of the 2.7oz over
the
3.4oz material by the various suppliers. It is an interesting
experiment to use the same people, tools, techniques, topcoats,
adhesives, preparation, manuals, and enviroment to cover one wing in
3.4oz and the other in 2.7oz. Try it once and see how different the
wing looks. I have.....one wing 3 times!!




--- In fairchildclub@yahoogroups.com, "Ashley Messenger"
wrote:

>
> This troughing will not happen if you are careful to lift the

fabric
away from any place it has unintentionally adhered. It is a simple
matter of inspecting the job closely after the brush coat of Poly-
Brush
has dried, and lifting the troughs by sticking a needle in the fabric
and prying it up. The hole the needle will make will self-heal with a
little heat, which will soften the Poly-Brush and allow the fibers to
move back into alignment.

>
> [Non-text portions of this message have been removed]
>

'