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"MAKE NO MISTAKE" while there are physical similarities between the Fokker company’s Dr.I and the D.VI, one was not developed from the other. Like any engineering concern the Fokker designers had formulas that they used for aircraft specifications, especially concerning the type and weight of an installed motor in an airframe. The closest similarity to the D.VI (rotary) is the D.VII (inline six.) Fokker built one for type testing in the ‘low altitude operations class’ and one for ‘higher altitude operations class. . ." the late Peter M. Grosz 2003.
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