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Aviation History
1935
1935 - 0031.PDF
JANUARY 3, 1935. FLIGHT. 17 A FAST ITALIAN MONOPLANE New Saioia Marchetti: . . Twenty-seven Passengers Carried at a Cruising Speed of 174 m.p.h. FLYING boats constructed by the Savoia Marchetti concern are well established in commercial operation, and their general features are known to readers of Flight. The company has, however, pursued of late a policy providing for the development of fast land machines of high- and low-wing monoplane types. Largest of the new Savoia series is the S.74 high-wing commercial monoplane, now under construction. In this machine, which uses a similar wing section to that em ployed on the S.55 flying boat and S.64 land plane which have established duration and distance records, the wing structure is of wood, and comprises three main spars, the whole wing being covered with plywood. Protective varnish is applied to the interior and the whole wing is given .1 covering of fabric. Four engine nacelles are carried below the wing, the inner pair being reinforced to support the compression legs of the undercarriage. Welded steel tubular construction is employed for the fuselage, in the nose of which is the pilots' cockpit fitted with dual controls. The passenger cabin is 7ft. 6in. wide and 6ft. 6in. high, and may be fitted with two alternative seating arrangements, one for twenty armchairs, with adjustable seats and backs, and the other for twenty- seven ordinary aircraft chairs. Large sliding windows on each side of the cabin serve as emergency exits. A bar and a lavatory are provided. Beneath the passenger cabin is a large luggage compartment with room for mail and freight. A split-type undercarriage is employed, the wheels being fitted with differentially controlled hydraulic brakes con nected to the rudder bar, and enclosed in streamline fair ings. The tail wheel is of the swivelling type. Welded steel tubes form the members of the empennage, and this is fabric covered. Tail plane incidence is adjustable in flight and the fin may be adjusted on the ground. Four 700 h.p. Piaggio "Stella IX" en gines, driving three- bladed Savoia Mar- chetti metal vari able pitch airscrews, are mounted on welded steel tube- bearers fixed to the; A sectional view of the S.74's cabin. Note how the luggage is carried beneath the floor. lower surface of the wing. The fuel tanks, which form fairings behind the engines, may be dropped during flight. An air compressor is installed in the pilots' cockpit for starting the engines. SAVOIA MARCHETTI S.74. FOUR 700 H.P. PIAGCIO " STELLA IX'S " DIMENSIONS Span Length Height Wing Area... 89ft. Sin. (30 m) 64ft. (79,5 m) ISft. (-5,5 m) 1,201 sq. ft. (120 ro') WEIGHTS AND LOADINGS Weight empty Normal disposable load ... Maximum permissible disposable load Normal gross weight Maximum permissible gross weight Wing loading Power loading Maximum 2,330 r.p.m. Cruising speed 2,050 r.p.m Climb to 3,280ft. (1 000 m) Climb to 6,560ft. (2 000 m) Climb to 9,840ft. (3 000 ni) Climb to 13,120ft. (4 000 m) Climb to 16,400ft. (5 000 m) Service ceiling 17,200 1b. (7 S00 kg) 11,907 lb. (5 400 kg) 13,671 lb. (6 200 kg) 29,106 lb. 13 200 kg) 30,870 lb. (14 000 kg) 22.55 lb. /sq. ft. (110 kgim*) 10.41 lb./h.p. (4,64 kgjhp) PERFORMANCE ON POUR ENGINES at 3,280ft. (1000 m) at at 3,280ft. (1000 m) at PERFORMANCE ON Service ceiling Maximum speed ... Service ceiling Maximum speed PERFORMANCE ON 199 m.p. h. (320 kmlh) 174 m. p. h. 280 kmlh) 3 min. 30 sec. 7 min. 30 sec. 12 min. 20 sec. 19 min. 30 miu. 19,680ft. (0 000 m) THREE ENGINES 9,840ft. (3 000 m) 162 m. p. h. (200 kmlh) Two ENGINES ... 3,280ft. (1000 m) ... 124 m.p.h. (200 kmlh)
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