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Re: new textile for historic aeroplane
Dear Jessie and all the others,
thanks a lot for your help!
I send all the informations to our Technology Objects Conservator, mainly I ask for him. We will see if and how we can realise our plan. We don´t want to use the synthetic version ceonite.
Best wishes Julia
-------- Original-Nachricht --------
> Datum: Fri, 12 Sep 2008 12:26:59 +1000
> Von: Jessie Firth <Jessie.Firth@xxxxxxxxxx>
> An: TEXCONS@xxxxxxxxxxxxxxxxxx
> Betreff: Re: new textile for historic aeroplane
> Dear Julia,
>
> During the course of the last decade, staff at the Australian War
> Memorial have worked on a number of cotton and linen covered aircraft,
> including a DAP Beaufort, Avro Lancaster and more recently a Pfalz DXII
> and an Albatros D.V.a. These are static display aircraft although every
> effort has been made to apply the fabrics using the original methods and
> materials.
>
> A number of sources supply "Grade A Cotton" for the covering of
> aircraft. As to the precise thread count, fabric weight and elongation,
> we don't have instant access to the specifications so cannot advise how
> closely it matches your listed criteria. That said, being manufactured
> specifically with the intent to be used on airworthy aircraft, I'd be
> surprised if it did not conform to the current German standards.
>
> In the past, I believe we have used Vintage Aero Fabrics as a source
> for Grade A Cotton. Ross is helpful and a quick email through to him
> ought to clarify if their products are suitable.
> ross[AT]vintageaerofabrics[DOT]com
> http://www.vintageaerofabrics.com/pages/contact.html
> A number of our Second World War aircraft have cotton coverings on the
> control surfaces. During the First World War, linen coverings were more
> common although I have heard that due to supply issues, trainer aircraft
> were often covered in cotton, the more valuable linen being reserved for
> aircraft less likely to be crashed as a result of inexperience.
>
> During the First and Second World Wars, cellulose nitrate lacquer dope
> was applied to wings. This was primarily to shrink/tension the fabric
> around the wing frame and provide a tight aerofoil surface. Anecdotally
> it has been suggested that while the doped surface was somewhat
> weatherproof, this may have been supplemented by additional varnishing
> over the doped surface.
>
> Cellulose nitrate lacquer had a number of drawbacks, being both solvent
> in aviation fuel and also highly flammable. Circa the early 1950's
> Cellulose Butyrate Acetate came into use as a replacement dope lacquer
> and many aircraft builders ceased using nitrate dope (however it is
> still available).
>
> If you intend for the finished aircraft to get significant outdoor
> exposure to both UV radiation and moisture, we would suggest using
> butyrate/acetate dope rather than nitrate dope. research we are in the
> process of completing suggests that over a very extended period (30+
> years) butyrate dope continues to shrink slowly and problems may develop
> with the fabric becoming too tight. Nitrate dopes appear to do this to
> a far lesser degree but deteriorate quicker under weather exposed
> conditions.
>
> Commercially, it is also possible to obtain woven polyester fabrics for
> aircraft covering. These do provide improved weather tolerance however
> in my experience, obtaining an authentic vintage appearance with these
> fabrics is problematic, the end result often looking somewhat "plastic"
> or artificial when viewed up close. The best results I have seen from
> people working with these materials were at the Shuttleworth Collection
> in the United Kingdom.
>
> Hope this is of some assistance,
> Jessie Firth, Textiles Conservator, Australian War Memorial; Andrew
> Pearce, Large Technology Objects Conservator, Australian War Memorial.
>
> ------------------------------------------------------------------------------------------------------------------------------------------------
>
> Dear all,
> we are in the process of conservation a historic aeroplane and would
> like to cover it with a new textile. The aim is to let the aeroplane fly
> again. The new covering is to match the old one. Therefore, we are
> looking for a textile which is specifically made for this purpose. It
> has to fulfil the following demands (German Standarts DK 677.064:629.73
> of 1968):
> - cotton yarn 100 dtex x2
> - plain weave, wrap desity 33 +/- 2 threads per cm; weft-density 33 +/-
> 2 threads per cm
> - finishing: mercerisised, mould-inhabitant
> - width: minimum 130 cm
> - weight: 135 g/m2 +/- 5%
> - maximum elongation per warp an weft 13% (at 850 kg)- tensile strength
> per wrap and weft: 1300 kg/m
> thanks very much for your information to find such a fabric! Julia
>
> Dipl. - Rest. Julia Dummer
> Museumslandschaft Hessen Kassel
> Textil- und Lederrestaurierung
> Postfach 410 420
> D – 34 066 Kassel
> Fon 0049 (0) 561 316 80 326
> Fax 0049 (0) 561 316 80 333
> j.dummer@xxxxxxxxxxxxxxxx
> www.museum-kassel.de
>
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>
>
> Jessie Firth
> Textile Conservator
> Australian War Memorial
> Ph: (02) 6243 4421
> jessie.firth@xxxxxxxxxx
> www.awm.gov.au ( http://www.awm.gov.au/ )
>
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--
Julia Dummer
Diplomrestaurtorin für Textilien und Leder
Hansastr. 3
D-34119 Kassel
Tel.: +49 - (0)561 - 73 93 266
mob. Tel.: +49 - (0) 177 - 25 26 373
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