WW1 the eBay finds (1 Viewer)

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Kondor D 6 nur 1 Stück gebaut im Sommer 1918

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Kondor made the D II and D IV, the same aircraft except the D IV had the split upper wing.
The D IV was 5 KPH slower than the D II, no doubt because of that split upper wing intended to improve forward vision.

They evidently didn't understand wingtip vortices , and their influence on performance.
 
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