History of Airplanes

From Aero Digest, April, 1935:

The Northrop Corporation, Inglewood, California

• Five- or eight-place low-wing monoplane. ATC 553. Wright Cyclone SR1820 F-3 engine, 710 horsepower at 7000 feet, or Wright Cyclone SR1820 F-2 engine, 735 horsepower at 4000 feet or P. & W. of equivalent power. Span 47 feet 9.5 inches. Length overall 33 feet 1.125 inches. Wing area 363 square feet. Power loading 10.3 pounds per horsepower. Wing loading 21.2 pounds per square foot.

Empty weight 4540 pounds. Useful load 2810 pounds. Payload 1295 pounds. Gross weight 7350 pounds. Fuel capacity 328 gallons. Oil capacity 22 gallons.

Maximum speed 223 miles per hour. Cruising speed 210 miles per hour. Landing speed 60 miles per hour: Service ceiling 20,000 feet. Rate of climb 1200 feet per minute . Cruising range 1700 miles.

Fuselage: all-metal monocoque construction; center section of wing built integral with fuselage. Wings: all-metal multi-cellular cantilever construction; two outer wings are separate from center section of wing; electrically operated all-metal flaps on outer wings. Tail group: all-metal multi-cellular cantilever construction; balanced; fin and stabilizer fixed; rudder and elevator equipped with trim tabs on trailing edge, adjustable from cockpit. Fixed-type cantilever strut-type fully enclosed and streamlined landing gear equipped with 36 X 8 tires, Bendix wheels and hydraulic brakes. oleo pneumatic shock absorbers. Engine and plane controls ball or roller bearing equipped.

Standard equipment includes retractable or fixed leading edge landing lights in the wings, navigation lights, fully equipped lavatory optional, Hamilton Standard two- or three-bladed controllable-pitch propeller.

Usual flight and engine instruments including Sperry directional gyro, Sperry gyro horizon, ice warning indicator, rate of climb indicator, tachometer, air speed indicator, oil temperature gauge, oil pressure gauge. Also see data in December, 1933, Aero DIGEST .