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Aviation History
1915
1915 - 0511.PDF
JULY 16, 1915. (/OGHTJ THE HEINRICH MILITARY TRACTOR BIPLANE. DESIGNED primarily with the intention of meeting the purpose of building these machines to the order of one U.S.A. Army's and foreign governments' requirements, of the European Governments. prominent amongst which may be mentioned fast climb- Two of the outstanding features of the Heinrich ing, good speed range, and general stability, the Heinrich biplane are the short and very broad body, accommo- Three-quarter view from the front of the Heinrich military tractor biplane. tractor biplane is an interesting example of recent American practice. It must be admitted that this machine certainly possesses more originality in design than some of the military machines lately turned out away yonder. Heinrich Brothers, of New York, have been constructing monoplanes for several years now, and this machine, which, by the way, was designed and con structed in record time, is their first biplane. As far as actual performance goes the Heinrich biplane put up a decidedly good show on the first time of asking, when Albert S. Heinrich, accompanied by Mrs. Heinrich, climbed it at the rate of about 1,000 ft. per minute. Subse quent flights brought out further favourable points—a speed range of 45 to 80 miles per hour, climbing speed dating the pilot and two passengers—side by side—and the svvept-back wings. The latter are virtually in four sections, the top plane being in two and attached to a small central panel mounted above the body by four struts, and the bottom plane in two attached direct to the body. Each section is built up on two main spars of I section, the webs being of ash and the flanges of spruce. The front spars are situated 9 ins, from the leading edge, and about 2 ft. 9 ins. from the rear spars. The ribs, which are spaced 9 ins. apart, are built up of ash webs and spruce flanges, reinforced where the interplane struts are attached to the planes. Laminated four-ply ash is employed for the wing tips, which are rounded off Morane fashion. The top plane is staggered forward 9 ins., Three-quarter view from the rear of the Heinrich military tractor biplane. with pilot and passenger and fuel for four hours of 4,000 ft. in 10 minutes. Flying light, a speed of 90 miles per hour has been attained.' We believe large-works have been taken over by the Heinrich Company for the and both top and bottom planes are inclined backwards 50. Each top and bottom section is separated by two pairs of struts, and ailerons measuring 8 ft. 3 ins. by 2 ft. are hinged to the rear spars of the top plane only. The 5 Pi::.
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