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The Douglas proposal for the U.S.Navy requirement for COIN (1963), the D-855, envisages an aircraft of relatively conventional configuration powered by two T74 or T76 turboprops underslung on a shoulder-mounted wing, a retractable nose-wheel undercarriage, and two crew members seated in tandem ahead of the wing. Six fully-equipped troops or a 6,000-lb. (2,722-kg) payload may be accommodated by the fuselage, and weapons loads will be carried on five hard points, a 1,400-lb. (635-kg) capacity hard point being provided on the fuselage centreline, a 1,200-lb. (544-kg) hard point being situated beneath each wing root, and two 600-lb. (272-kg) points being positioned just in- board of the wingtips. A maximum speed of approximately 230 m.p.h. (370 km/h) is anticipated, minimum speed being 75 m.p.h. (121 km/h), and a 50-ft. (15.2-m) obstacle will be cleared on take-off within 750 ft. (229 m).
Flying Review International, 1963 via Ton Meynders, http://www.airwarfareforum.com