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Aviation History
1918
1918 - 1187.PDF
OCTOBER 24, 1918. THE D.H.5 PURSUIT BIPLANE THE^D.H.5 pursuit biplane herewith described was built bythe Darracq Motor Engineering Co., Ltd., London, and bears the identification mark A 943 5. It is a tractor biplane, witha single pair of interplane struts on either side and with the wings set at a negative stagger of 0.695 m- Both wings have a span of 7.84 m. and a chord of 1.375 m-The upper wings are fixed to a centre section, while the lower are joined to wing roots at the height of the lowerbottom longitudinals. There is no sweepback, but both wings have a dihedral of 1720 ; the angle of incidence of the upperwing is 20 amidwings and i\° at the tips, while that of the lower wing is 2$° throughout. below in front of the leading edge, and above, over the frontspar. The body is of the ordinary four-longitudinal type bracedby cross wiring, and is strengthened, in front, up to the pilot seat, and at the rear, underneath the tail plane, by a plank-ing of 3 mm. plywood. Suitable formers give the body in front a neat circular cross section, the whole body beingcovered with canvas. The undercarriage is of the V-type, with solid, streamlinedwooden struts, and a continuous axle which rests between two auxiliary axles. The spring range of the axle is not limitedin any way. Three-quarter front view of a D.H. biplane on view at Trafalgar Square some months ago. f The wing spars are of spruce and of I-section. The ribs are spaced from 280 to 350 mm., and between each two ribs there are two false ribs, reaching from the leading edge to the front spar. The interplane and cabane struts are made solid of spruce, and the flying and landing stays are of streamlined wire. Ailerons -are carried on both wings, hinged to the rear spar. Side Elevation. The control leadsfbf streamlined wire, run outside the planes, F • Translated from Zeitschrift fiir Flugtecknik uttd Motorluftschigahrt by Aviation, New York. . -..„.-,. - .... The tail plane is of one piece, and is mounted on the body at an angle of incidence of 1 °, without the customary incidence- changagear. The elevator is of the divided type, each portion having its own crank with single control leads. The power plant consists of a noh.p. rotary Le Rhone engine, which is known to have developed 130 h.p. in earlier tests. The main fuel tank contains 100 litres of gasoline, and the oil tank has a capacity of 21 litres ; both are mounted behind the pilot. There is in addition an emergency gravity fuel tank of 26 litres capacity, which is mounted on the upper starboard wing. The engine is fed from the main tenk by compressed air, generated by a small air pump, which is Three-quarter rear view of a D.H. biplane in Trafalgar Square. II88
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