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.

JRM Mars
JRM-2 Mars "Caroline Mars" in US Navy service
Role Flying boat
National origin United States
Manufacturer Glenn L. Martin Company
First flight 23 June 1942
Introduction 30 November 1943
Retired 1956 (USN)
Status Inactive
Primary users United States Navy (historical)
  • Forest Industries Flying Tankers (FIFT) (historical)
  • Coulson Flying Tankers (historical)
Produced 1945–1948
Number built 7
Developed into Martin 193

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.

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