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Johan,
actually at least 2, but maybe even 3 prototypes of teh D VI were build, but they only flew after November 11, so no further orders followed.
One aircraft destroyed by an inflight fire (I´m quite sure about this, but can´t find the source at this moment), another one or two destroyed in the Siemens factory, either to follow the treaty rules, or to prevent capture by the allies.
The D VI was the last in the series of parasols that followed the Fokker E V/D VIII (others including the Pfaly parasol, the Kondor E 3/D I, the LFG D XVI and D XVII, the Daimler L 11, the planned Junkers J 6 and the various Fokker developments). I think one of the most neglected stories in WW I aircraft development is Idfliegs "guiding hand" in German aircraft design, which resulted in those sudden changes in design philosphies, like the "copy the Nieuport" time, the triplane craze, the "copy the SPAD" period, the Verspannungslos and finally the "parasol is the aircraft of the future" (quote) development.
The D VI definitely was promising, with a climb rate exceeding that of the benchmark SSW D III/DIV and Rumpelr D I aircraft. I would be careful about the speed claimed by various sources, as
- the aircraft was never subject to an official test
- in Germany speed measurements were never as advanced as for example climb measurements.
Nonetheless a potentially great aircraft - and a damn good looking one as well..
Volker
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