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Volker:
They covered aircraft with linen or cotton fabric that weighed 3.5 to 4.5 ounces per square yard. They did not use canvas. Canvas is linen or cotton woven fabric that weighs more than 8 ounces per square yard.
Most aircraft manufacturers used plywood to cover the upper surface of the wing from the leading edge to the front spar. Birch three ply, plywood around, 1.5 to 2.0 mm thick was used. Albatros, SPAD, Nieuport, to name a few did this to improve the leading edge entry for lift and to strengthen the leading edge.
Fokker Flugzeugwerke used 1.5 mm birch 3 ply, plywood on the leading edge of the Fok. DR.I, Fok.D.VI, and the Fok.D.VII. With the Fok. E.V/D.VIII, the entire wing, was covered with 1.5 mm, 3 ply Birch plywood.
Happy New Year,
Dan-San
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