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Aviation History
1924
1924 - 0382.PDF
JUNE 12, 1924 The tail surfaces are of spruce, covered with ply-wood, the horizontal stabilising surface being in one piece, passing right through the fuselage, to which it is attached by riveted angle-pieces. The landing chassis consists of two pressed duralumin bearers or struts, in the lower ends of which are formed rectangular channels receiving the axle guides. The main petrol tank is located between the engine and the pilot's cockpit, and is detachable during flight. An auxiliary tank is mounted in the upper plane. Cooling is by two Lamblin radiators mounted on the fuselage below the engine. The twincipal characteristics of the Spad81 C.l are: Span (top), 8-804 m. (29 ft.) ; span (lower), 6-400 m. (21 ft.) ; wing area, 30 sq. m. (322-8 sq. ft.) ; weight, empty, 800 kgs. (1,760 lbs.) ; usefulload, 450kgs. (990lbs.); wingloading, 41 -600 kgs./sq. m. (8-5 lbs./sq. ft.) ; power loading, 4 • 160 kgs. h.p. (91bs.'/h.p.) ; speed. 250 km. per hour (155 m.p.h.) ; ceiling (full load), 8,000 m. (26,400 ft.). DEWOITINE. THE .Dewoitine exhibit is an all-metal parasol monoplane, type D.l, fitted with a 300-h.p. Hispano-Suiza engine, and intended for scouting work. Its fuselage is constructed entirely of duralumin, being built up of four main spars, and secondary struts, of semi-circular or U section. The covering is also of duralumin. A thick section semi-canti lever wing is employed, being supported in the centre a short distance above the fuselage by a short vertical panel, or en closed cabane, while two pairs of struts extend from the lower longerons of the fuselage up to the wing spars at a point type, fitted with a 180 h.p. Hispano-Suiza engine. The main plane, which is without dihedral angle, is rigidly supported above the fuselage by eight steel struts, two pairs each side. The forward struts on each side are attached to the lower longerons of the fuselage at the point of attachment of the front chassis struts, while the rear struts are also attached to the lower longerons at the rear chassis strut attachment. One pair of these struts, front and rear, are taken to points on the front and rear spars respectively of the main plane, a short distance from the wing tips. The other pairs of struts are taken to points on the front and rear wing spars midway between the first strut attachments and the centre of the wing. This latter part of the wing is sup ported by two short inverted V-pylons from the fuselage. This wing-strut arrangement is further braced by wires and by steel tubes, the latter connecting the inner strut attachments (on the wing) with the centres of the outer struts. A cross tube further connects the front and rear struts at their centres. The fuselage is of rectangular girder construction, built up entirely of metal. It consists of four tubular longerons, the upper ones of steel and the lower ones of duralumin, and tubular cross members. Light formers and stringers give the whole fuselage a good streamline form. The engine is carried in a " cradle " built up of pressed duralumin. The pilot's cockpit is located near the trailing edge of the wings, a portion of the latter being cut away to provide a clear vision upwards. A circular radiator, encircling the propeller shaft, is mounted in the nose of the fuselage. 5S ^ ^ ^ The Gourdou- Leseurre Mono plane, 180 h.p. Hispano- Suiza engine. I | .- ^SXX^SS^ midway between the centre and the tips of the wings. The wings taper, both in thickness and chord, toward the tips, and the ailerons, which are unbalanced, are of high aspect ratio. The horizontal tail surface, which is comparatively small, is built up of two spars and two duralumin tubes which serve as ribs. Its angle of incidence can be varied during flight. The landing gear is of the V-type, of duralumin, carrying a divided duralumin axle. It is provided with a patent shock- absorbing device. Two duralumin V's, and four tubes con nected to the first truss of the fuselage, support the engine, which is fitted with a Letombe starter. Petrol is fed by two A.M. pumps, the petrol tank being located between the pilot's cockpit and the engine, from which it is separated by a duralumin bulkhead. The new 1924 Lamblin strut-radiators are fitted. This machine was purchased by the Minister for National Defence for Czecho-Slovakia. The principal characteristics of the Dewoitine are : Span, 11 500 m. (37 ft. 9 ins.) ; overall length, 7-550 m. (25 ft.) ; wing area, 20 m.2 (215 -2 sq. ft.) ; weight of machine, empty, 820 kgs. (1,808 lbs); useful load, 420 kgs. (924 lbs.) ; total weight, 1,240 kgs. (2,734 lbs.) : wing loading. 62 kgs./sq. m. (12-7 lbs./sq. ft.) ; power loading, 4-150 kgs./h.p. (9-15 lbs./ h.p.); speed, 250 km. per hour (155 m.p.h.) ; ceiling, 9,000 m. (29,700 ft.). GOURDOU-LESEURRE THE machine exhibited by C. Gourdou and J. Leseurre, of St. Maur (Seme), is a chaser monoplane of the " Parasol " The principal dimensions, etc., of'this machine are;— Span, 9-600 m. (31 ft.7ins.) ; length, 6-430 m. (21ft. 2 ins.) ; height, 2-3700 m. (7 ft. 10 ins.) ; wing area, 18 S sq. m. (201 sq. ft.J ; weight emptv, 660 kgs. (1,455-3 lbs.) ; useful load, including fuel 300 kgs. (661-5 lbs.): total weight, 960 kgs. (2,116-8 lbs.) ; speed, 248 km. p.h. (153-7 m.p.h.) ; ceiling, 7,500 m. (24,750 ft.). HENRY POTEZ. THIS firm, although but comparatively recently established —having succeeded the " S.E.A. " Company of the War period—has produced quite a number of successful machines of various types. They are exhibiting at Prague a recon naissance machine, type XV.A.2, fitted with a 370 h.p. Lorraine-Dietrich engine. In general design, this machine is of the orthodox fuselage-tractor biplane type. Upper and lower planes are of equal span, the top plane being in three sections—two outer ones attached to a smaller centre section. The lower plane is in two sections, each attached direct to the lower longerons of the fuselage. Upper and lower planes are separated by four pairs of duralumin struts, and the external bracing is by streamline " wires." The main spars of the double-T type, in spruce, and the ribs are built up of plywood webs and flanges of grisard. The whole wing-frame is braced by spruce cross members and steel wire. Ailerons are fitted to upper and lower planes, and are balanced by small extensions projecting out wards. The control acts on the lower ailerons, and is trans mitted to the upper ailerons by streamlined struts. The 382
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