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Fokker experimented with the plywood covered wing as early as the Fall of 1916 when Villehad Forsmann was hired to build a plywood covered wing as a feasibility study for the M.21-M.22 prototypes (Hope I got that right! I need to recheck!), the M.22 which entered service as the Fokker D.V. Fokker ended up going with a fabric covered wing, but on the prototypes V.1-V.3 Fokker used the plywood covered wing of deep section which used the cantilevered box spar technique.
The Fokker E.V was the first production fighter to employ this. There were several monoplane prototypes built by Fokker with plywood wings.
The Austro-Hungarians used a ply covered wing in the Lloyd C.V aircraft. It was revolutionary, but developed problems in the rough conditions of the airfields and effects of exposure. Dew and condensation would cause delamination of the plywood veneer. The covering technique wasn't possible for the poorly trained technicians to fix at the front. Also, the WKF D.I fighter prototype used a ply covered wing, but production versions reverted to fabric covering, because of the reasons given earlier.
Good idea at the time, but time intensive to build, and difficult to maintain with the skill level of the labor.
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Cigogne
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