Martin 4-0-4

Short to medium range airliner introduced in 1951

Overview

Glenn L. Martin United States ICAO: M404 1951–1953

The Martin 4-0-4 was designed and built by the Glenn L. Martin Company as a pressurized passenger short to medium range airliner introduced in 1951. It was developed from the Martin 2-0-2 and was produced from 1951 to 1953. On October 21, 1950, Martin 4-0-4 conducted its maiden flight, and aside from being an airliner, it was also used by the United States Coast Guard and the United States Navy by the designation RM-1G.

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Specifications

Units
Engine
2 × Pratt & Whitney R-2800-CB16
Engine type
Piston
Power
2 × 2,400 hp · 1,790 kW
Avionics
—
Wing tips
No winglets
Seats
40
Crew
—
Cabin width
—
Cabin height
—
Cabin length
—
Exterior length
74 ft 6 in  ·  22.70 m
Tail height
28 ft 3 in  ·  8.60 m
Fuselage diameter
9 ft 6 in  ·  2.90 m
Wing span
93 ft 3 in  ·  28.42 m
Baggage volume
—
Gross weight
—
Empty weight
—
Max takeoff weight
44,900 lb  ·  20,400 kg
Max landing weight
40,200 lb  ·  18,200 kg
Max payload
8,950 lb  ·  4,050 kg
Fuel capacity
2,000 gal · 7,600 L · 5,500 kg (AvGas)
Max cruise speed
271 kt  ·  312 mph  ·  502 km/h
Maximum speed
—
Cruise speed
—
Approach speed
70 kt  ·  81 mph  ·  130 km/h
Range
2,300 nm  ·  2,650 mi  ·  4,260 km
Fuel burn
—
Ceiling
29,000 ft  ·  8,800 m
Rate of climb
1,905 ft/min  ·  10 m/s
Takeoff distance
1,970 ft  ·  600 m
Landing distance
1,740 ft  ·  530 m
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Martin 4-0-4 in colours of Pacific Air Lines.

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Operational Context

The Martin 4-0-4 emerged out of the Martin 2-0-2, but with pressurization, restrengthened wings, and a longer fuselage. Similar to its antecedent, the 4-0-4 was built as a cantilever monoplane fitted with a cantilever tail unit. It was also equipped with an airstair located in the lower tail section so the passengers may board and alight the aircraft easily. On October 21, 1950, the aircraft took to the air for the first time. It was produced from 1951 to 1953 with a total of 103 4-0-4s built.

The Martin 4-0-4 can accommodate three to four crew members and up to forty passengers. It has an exterior length of 22.73 meters, an exterior height of 4.7 meters, a tail height of 8.6 meters, and a fuselage width of 2.9 meters. The retractable undercarriage has a wheelbase of 7.3 meters. It has a wingspan of 28.42 meters and a wing area of 80.3 square meters. The empty weight is 13,211 kg and the maximum takeoff weight is 20,366 kg. It has a maximum landing weight of 18,231 kg, a maximum payload of 4,050 kg, and a fuel tank capacity of 2,000 kg.

The Martin 4-0-4 is fitted with two Pratt and Whitney R-2800-CB16 eighteen cylinder two-row air-cooled radial engine with 2,400 horsepower of takeoff thrust each and 1,800 horsepower for normal thrust. The engine drives a three-bladed Hamilton Standard 2H17K3-48R propeller. The aircraft has a maximum speed of 271 knots at 14,500 feet, a cruise speed of 240 knots at 18,000 feet, and a stall speed of 70 knots at sea level. It has a travel range of 940 nautical miles and a ferry range of 2,300 nautical miles. The Martin 4-0-4 can fly up to 29,000 feet and can climb at a rate of 1,905 feet per minute. The takeoff and landing distance to and from 15 meters is 600 meters and 530 meters, respectively.