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Aviation History
1934
1934 - 0691.PDF
FLIGHT, JULY 5, 1934 COMMERCIAL "AVIATION AIRLINES 7\IRPORTS AN AMERICAN FEEDER-LINE MACHINE The Lockheed "Alcor" follows "Vega" Lines, but has Two Menasco Engines -R. ALLAN LOCKHEED, who was, at one time, connected with the Lockheed Aircraft Corpora- tion, has been working for two or three years perfecting the design of a high-wing monoplane equipped with two Menasco engines mounted in an unusual manner. The machine is now out of the experimental stage, and is regarded as an efficient feeder-line aircraft. The cantilever wing, fuselage and empennage are ply- wood structures, and the general layout of wing and fuselage closely resembles that of the Lockheed " Vega." The cabin is 8 ft. 10 in. long, 51 in. high and 40 in. wide, and there is a total baggage space of 40 cu. ft. Four passengers are accommodated in addition to the pilot and co-pilot, but this number may be increased to eight. Hydraulic shock absorbers are used in the vertical struts of the landing gear, which run. to the front main spar. Low-pressure wheels, faired with " spats," and a stream- lined tail wheel are employed. Two 6-cylinder air-cooled supercharged Menasco " Buccaneer " engines, giving 230 h.p. each, are mounted in a horizontal position with their airscrew hubs 93 in. apart. Hamilton standard controllable-pitch metal air- screws, 7 ft. 6 in. in diameter, are employed. The oil tanks are built into the space between the engines. It is LOCKHEED "ALCOR " 2 MENASCO " BUCCANEER " ENGINES Dimensions Wing span ..Length HeightWing area .. Weight, empty Useful loadPay load Wing loadingPower loading Cruising speed Maximum speed .Landing speed Climb, at sea level We Per/or Ceiling with maximum loadCeiling on one engine Range at cruising speed . 42 ft. (12,S1 m). 28 ft. 5 in. 8,66 m) 9 ft. 6 in. (2,'JO tn). 282 sq. ft. (26,19 sq. m) . 2,665 lbs. (1 210 kg) gilts . 2,045 lbs. (927,59 kg). 1,200 lbs. (545 kg) . 16-7 lbs./sq. ft. (R1,S kg/sq. tn)10--2 1hs./h.p. (4,55 kg/cv) mance . 157m.r.h. (25Sk.p.h.) . 183m.p.h. (294k.p.h.)57 m.p.h. (92 h.p.h.) 1,400 ft./minute (427 mjminute). 19,000 ft. (5 795 m) . 6,400 ft. (1 952 m)700 miles (1125 km) Fuel consumption at cruising speed 16 • 66 galls./hr. (75,7 litres/hr) Oil consumption at cruising speed 1 quart/hr. (0,95 htrejhr) claimed that the vibration impulses of one engine opposethose of the other, and Menasco engines are known to be particularly smooth. It is possible to remove the entireengine group, with oil tanks, as one unit. During recent demonstration flights it was proved thatthe machine can take off and climb at the rate of 400 ft. a minute from sea level on one engine. When the star-board airscrew was removed the machine took off after a 1,200-ft. run and reached a speed of 130 m.p.h. in hori-zontal flight. Furthermore, the pilot reported that it handled in a similar manner to a conventional single-engined aircraft. FOR FEEDER LINES: The Lockheed 693 Alcor " high-wi ng monoplane.
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