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General Info

Lockheed Vega 
Role Transport
National origin United States
Manufacturer Lockheed Aircraft Limited
Designer John Knudsen Northrop and Gerald Vultee
First flight July 4, 1927
Introduction 1928
Status Retired
Primary user Commercial air carriers
Number built 132

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History Martin Aircraft Company
Martin JRM Mars  



The Martin JRM Mars is a large, four-engined cargo transport flying boat designed and built by the Martin Company for the United States Navy during World War II. It was the largest Allied flying boat to enter production, although only seven were built. The United States Navy contracted the development of the XPB2M-1 Mars in 1938 as a long-range ocean patrol flying boat, which later entered production as the JRM Mars long-range transport.

Four of the surviving aircraft were later converted for civilian use to firefighting water bombers. Two of the aircraft still remain based at Sproat Lake just outside of Port Alberni, British Columbia, although neither is operational..

Operational history

U.S. Navy service

JRM-1 BuNo 76820, Philippine Mars taking off from San Francisco Bay, 1946
Named the Marianas Mars , Philippine Mars , Marshall Mars , Caroline Mars , and a second Hawaii Mars , the five production Mars aircraft entered service ferrying cargo to Hawaii and the Pacific Islands on 23 January 1944. The last production airplane (the Caroline Mars ) was designated JRM-2, powered by 3,000 hp (2,200 kW) Pratt & Whitney R-4360 engines, and featured a higher maximum weight and other improvements. On 4 March 1949, the Caroline Mars set a new world passenger load record by carrying 269 people from San Diego to San Francisco, CA . On 5 April 1950, the Marshall Mars was lost near Hawaii when an engine fire consumed the airplane after her crew had evacuated. The remaining "Big Four" flew record amounts of Naval cargo on the San Francisco - Honolulu route efficiently until 1956, when they were beached at NAS Alameda .

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Martin JRM Mars

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General characteristics

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Specifications

    • Crew: four (with accommodations for a second relief crew)
    • Capacity: JRM Mars - 133 troops, or 84 litter patients and 25 attendants or 32,000 lb (15,000 kg) payload, including up to seven Willys MB jeeps
    • Water/foam load: Mars waterbomber  (27,000 kg)
    • Length: 117 ft 3 in (35.74 m)
    • Wingspan: 200 ft 0 in (60.96 m)
    • Width: (4.11 m) Hull beam
    • Height: 38 ft 5 in (11.71 m) afloat, 48 ft (15 m) beached
    • Hull draught: 5 ft 6 in (1.68 m)
    • Empty weight: (34,279 kg)
    • Powerplant: 4 × Wright R-3350 Duplex-Cyclone 18-cylinder radial engines, 2,500 hp (1,900 kW) each                                                                     
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Performance

  • Maximum speed: (356 km/h,
  • Cruise speed: 190 mph (310 km/h
  • Range: 4,900 mi (8,000 km,
  • Service ceiling: 14,600 ft (4,500 m)
  • Drop speed: 138 mph (222 km/h)                                                                                                                 
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Martin JRM Mars

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