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for an Army contract, the Model D was similar to Model R Roadster.
However, instead of the V-8 motor, the army plane had the 6-60 motor. The
Model D could fly 66.9 mph and climb 525 feet per minute, but its
excessive landing speed discouraged the Army from ordering more.
References:
[Submitted by Joe W. McDaniel] |
 The Wright Model D had to be landed fast to keep the air flowing over the control surfaces. If it flew too slow, it wouldn't respond to the controls. |