The Wright Model D was built to sell to the United States Army for an observation aircraft.

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.

The single seat aircraft was made from ash and spruce wood coated with aluminum powder.

It was powered by the last six cylinder engine built by the Wright Brothers with a rubber band drive on the flywheel.

[2] Orville Wright considered the Model D “the easiest to control of any we have ever built” with the exception of the high landing speed.