Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Wright Model D was built to sell to the United States Army for an observation aircraft. It was similar in design to the Wright Model R with a 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. The single seat aircraft was made from ash and spruce wood coated with aluminum powder. It used forward mounted finlets to stabilize the aircraft. It was powered by the last six cylinder engine built by the Wright Brothers with a rubber band drive on the flywheel. The 406 cubic inch engine ran at 1,400 to 1560rpm powering two counterrotating propellers via chains.

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