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Aviation History
1920
1920 - 1143.PDF
NOVEMBER 4, 1920 TWO-SEATER AVRO "BABY" BIPLANE, TYPE 543 THIS aeroplane is a development of the little 35 h.p. single-seater Avro " Baby " biplane, type 543—a full description, with scale drawings, of which appeared in FI.IC.IIT for June 26,1919—which has put up such a remarkable series of per- formances during the last eighteen months, including 1stin Aerial Derby Handicap 1919, 1st and 2nd in Aerial Derby Handicap 1920, and non-stop flight to Turin, includingcrossing the Alps Except for the longer cockpit and the slightly furtherforward position of the engine, which has been so placed in order to balance the weight of the passenger, it will be seenthat the two-seater " Baby " is practically identical with the single-seater " Baby." Duration cruising at 1,000 ft. Cruising range Climb to 1,000 ft. Climb to 2,000 ft. Climb to 5,000 ft. Climb to 6,600 ft. Climb to 10,000 ft. . . Ceiling 12,000 ft. in . .Maximum speed : Sea level 6,600 ft 10,000 ft. From the above figures it will be seen very efficient, and the ease with which 2 hrs.22? miles. 2i' 4i 13 mins.mins. mins. • lii mins. 35 ;o 82 77 72 that mins.mins. m.p.h. •5 m.p.h. •5 ni.p.h. this machine is it can be landed in The Avro Two- Seater "Baby" Biplane : Three- quarter front view * The following is a summary of the technical data of the two-seater Avro " Babv " :—Span of top plane . . Span of bottom plane Chord ot planes Gap between planes Stagger of planes ' Length overallHeight overall Span of tail-plane Chord of tail and elevatorsArea of planes and ailerons Area of tail and elevatorsAngle of incidence of planes Dihedral angle Weight bare (with water) Weight loaded .. .. -Surface loading Engine loading (40 h.p.) Petrol capacity . . . . Oil capacity . . 2,- ft. 23 ft. 4 ft. 4 ft. 3 in. 1 ft. 6 in. 20 ft. 7 ft. 6 in. 7 ft. 6 in. 3 ft. 5i in. 176* sq. ft. 22J sq. ft. 4jdegs. 3 degs. 630 lbs. 970 lbs. 5i lbs./sq. ft.24-2 lbs./h.p. 8 galls. ih galls. The following performances were obtained from the average of a number of carefully' conducted test flights carried outat the Hamble Aerodrome, near Southampton :— Maximum speed (sea level) Landing speed Stalling speed Cruising speed at 1,000 ft. . . Petrol consumption cruising at 1,000 ft. 82 m.p.h. 40 m.p.h. 40 m.p.h. 70 m.p.h. 2 4 galls, per hr. and flown out of small fields makes it particularly suitable for cross-country flying. The machine is reported as light and quick on the controls at high and low altitudes. Tt is claimed that it can be flown equally well without a passenger, and can perform all the " stunts " which are expected of modern aeroplanes. Construction The undercarriage is of the " Vee " type with, a split axle, hinged in the centre. The chassis is entirely constructed of steel tube, faired off with light 3-ply fairings, which are, in turn, covered with linen, doped and painted. The wheels, fitted with Palmer cord tyres 600 by 50 mm., are sprung by the usual rubber shock-absorbers, while the track, 5 ft., is wide for such a small machine. The tail skid is made of ash, with a steel shoe, and is also sprung with rubber shock-absorbers. The planes are built up in the " Avro " manner, the main spars being of built-up box section with spindled wooden leading edge and tubular steel end sweeps and trailing edges. The ribs, of girder construction, are placed close together so as to retain a good wing form and R.A.F. 15 Section. Small nose ribs are placed between each of the main ribs. Internal bracing is hv means of high tensile steel wire and " Avro " turnbuckles. Compression struts are formed of strong box ribs, as in the standard " Avro " type. Only one pair of interplane struts is used on each side of the body, and the lift wires are splayed out so as to attach to the body over a wide length, this distributing the lift loads along the body and also assisting the internal bracing of « - • •.-.-.. i •:...••. '^P 't fg The Avro Two- Seater "Baby" Biplane : Three- ^ quarter rear 85 view "45
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