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Aviation History
1938
1938 - 1337.PDF
MAY 12, 1938. FLIGHT, THE HAWKER HURRICANE (990 1,050 Rolls-Royce Merlin Engine) DIMENSIONS. Lengtho.a. ... . .. 81ft. 5ia. Wing span .. .. .. 40ft. Oia.Span of tailplane lift. Oin. Wheel track 7ft lOin. AREAS. 1 Main planes (grossI .....„ (net) Ailerons (total!..Tailplane ... Elevator ...' . Fiu Kudder .. ••._.• u sq. ffe-257.5 ••.- 231.S,18.6 19.78ViAC 8.7U11.8S which is a single unit extending about three feet on each side of the fuselage, . the web is solid and stiSened by riveted- on vertical channels. In the outer wing portions the web has circular lightening holes with their flanges turned out for .stiffness. , It is, however, in the drag bracing that the Hurricane "motif" differs most from the biplane wings. The drag members are almost identical with the spars as regards their form and construc- tion, but slightly smaller. They run zig-zag fashion between the spars, and are bolted to top and bottom spar booms via substantial forgings, which are fastened to the spar booms by hori- zontal bolts. Thus the primary struc- ture ot the wing forms a frame, braced and stiffened by the diagonal drag mem- bers The resulting structure is enor- mously strong and, what is just as im- portant, is remarkably stiff in torsion. As a manufacturing job this arrange- ment is very simple. The zig-zag drag . members, held together by the forgings at their ends, form one unit. In vertical jigs, which are merely brackets on the wall, the two spars are attached and the primary structure is ready to receive the wing ribs. These are ot very simple type, and have ties or bracing members of circular- section tubes, while the flanges are simple channels with their free edges turned inwards. The bottom of the channel is not flat, but also forms a trough, the edges of which are rounded because the section is rolled or drawn from a single • Flight " photograph The tail wheel retracts into the casing seen in the stem of the fusp'.age. strip. The result is that the outer edges do not cut the wing fabric, which rests on them. The attachment of the wing fabric to the ribs is extremely strong When the fabric has been placed over the wing, a metal strip is placed over each rib channel and secured to it by Simmonds elastic stop nuts As these are tightened up the fabric is drawn into the channel of the rib and instead of being held only at a few places, as in attachment by lacing, the fabric is held by the whole area of the strips. Only over the inner wing portions, where it is often necessary to walk on the wings, is the covering of light- metal sheet. Here the wing rib channels have a plain smooth back for the attachment of the metal covering. The nose and trailing-edge ribs are attached to the spar booms by horizontal bolts, and form separate units. Over the rear spar a short length cat channel continues the contour of the rib. but on the front spar the ribs stop short at the spar boom That is because the lead- ing edge is covered with sheet metal, the rear edge of which passes over the spar booms Split trailing-edge flaps are fitted at the inner end ot the wings , These are of the ". single-surface" type, with a sheet metal bottom surface: stiffened, by ribs from the operating torque tube A notice in the cockpit tells the pilot not to use the flaps at speeds in excess of 120 m.p.h. The flaps are hvdraulically operated The ailerons are of the Frise type and are fabric covered The undercarriage is of the laterally retracting type. In the case of the Hurricane the wheels retract inwardly. By this arrangement a very wide wheel track is obtained,
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