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National Advisory Committee for Aeronautics, Technical Notes - Experiments with Fabrics for Covering Airplane Wings

The following report deals principally with the strength
and deformation of the fabric itself, both undoped and doped.
In the course of the investigations, it appeared that the
doping of the fabric with "Gallon" exercises a predominant
influence on the results, according to the nature and number
of the coats. It was decided, therefore,-to conduct the ex—
periments_in such a way that the prOperties of the fabric
when subjected to stresses would be brought out to the best
advantage. At the same time, it was endeavored to adapt the
degree of doping to actual conditions and to obtain greater
uniformity of elongation along warp and filling.

Hence two coats of cellon are applied for all comparative
tests. Parallel individual tests were also conducted with the
undoped fabric, as likewise with fabric doped three and four
times and then painted.

In a general way the figures obtained are not immediately
applicable in practice. Still less are they to be taken as
standard (with the exception of the results of individual tests
with repeated doping). By comparative tests, however, with the
usual repeated doping, individual standard figures may be ob-
* From Technische Berichte, Vol. 3, No. 3, pp, 57—73 — (1918).

tained from the experiments. These results are disregarded in
the present report, it being preferred to initiate further re-
searches with the customary doping and also with various kinds
of dope. On the other hand, the research apparatus, methods
and instructions are along the same lines as for the previous
experiments.

Wing fabrics are never used in the undoped condition, but
after being put on the ribs, are always given several coats of
dope and then painted over, if a different color is desired.
This report, therefore, deals particularly with fabric prepared
in this way, and plain fabric is considered only for the pur-
pose of comparison.