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.

Martin JRM Mars "1942"

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 Limited use
Primary users United States Navy
Coulson Flying Tankers Inc.
Produced 1945–1948
Number built 7
Developed into Martin 193

Martin Aircraft

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

Goto Martin Aircraft

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 are operational.


The Glenn L. Martin Company scaled up their PBM Mariner patrol bomber design to produce the prototype XPB2M-1 Mars.[1] The XPB2M-1 was launched on 8 November 1941. After a delay caused by an engine fire during ground runs, the aircraft first flew on 23 June 1942. After flight tests with the XPB2M between 1942 and 1943, she was passed on to the Navy. The original patrol bomber concept was considered obsolete by this time, and the Mars was converted into a transport aircraft designated the XPB2M-1R. The Navy was satisfied with the performance, and ordered 20 of the modified JRM-1 Mars.[1] The first, named Hawaii Mars, was delivered in June 1945, but with the end of World War II the Navy scaled back their order, buying only the five aircraft which were then on the production line.[2] Though the original Hawaii Mars was lost in an accident on the Chesapeake Bay a few weeks after it first flew, the other five Mars were completed, and the last delivered in 1947.

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 Alameda, CA. 

You are definitely intrigued to discover

Martin JRM Mars (1942)

In May 2015, the Hawaii Mars received a small contract to be used briefly for training Chinese pilots. This was done using the Martin Mars to evaluate against civil certification regulations by The International Test Pilot School, on how to handle such a large amphibious aircraft. These pilots will be involved with the Chinese state owned Aviation Industry Corporation of China as they get ready to launch their forthcoming AVIC TA-600 airplane. Subsequently, in July 2015, the airplane was put back in service after public outcry, being awarded a 30-day contract from the BC Government to help with a particularly bad fire season.

In 2016, the Hawaii Mars made its first appearance at EAA AirVenture Oshkosh in hopes of being sold or leased to a new home or business. One of the pilots on the way to Oshkosh was well-known Kermit Weeks. According to the Smithsonian Channel episode of Mighty Planes Martin Mars, only one Martin Mars is now flying.


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, 

Water/foam load: Mars waterbomber – 60,000 lb (27,000 kg)

Length: 117 ft 3 in (35.74 m)

Wingspan: 200 ft 0 in (60.96 m)

Width: 13 ft 6 in (4.11 m) Hull beam

Height: 38 ft 5 in (11.71 m) afloat, 48 ft (15 m) beached

Max takeoff weight: 165,000 lb (74,843 kg)

Powerplant: 4 × Wright R-3350 Duplex-Cyclone 18-cylinder radial engines.

Maximum speed: 221 mph (356 km/h, 192 kn)

Cruise speed: 190 mph (310 km/h, 170 kn)

Range: 4,900 mi (8,000 km, 4,300 nmi)

Service ceiling: 14,600 ft (4,500 m)

Drop speed: 138 mph (120 kn; 222 km/h)

Operations duration (normal): 5 1/2 hours

Area covered, single drop: 3 to 4 acres (1.2 to 1.6 ha)

Drop height: 150 to 200 ft (46 to 61 m)

Full water tank load: 7,200 US gal (27,000 l; 6,000 imp gal)

Aircrafttoaal encyclopedia

srael On 22 April 2013, an agreement was signed to sell six V-22 to the Israeli Air Force.[210] By the end of 2016, Israel had not ordered the V-22 and was instead interested in buying the C-47 Chinook helicopter or the CH-53K helicopter.[211] As of 2017, Israel had frozen its evaluation of the V-22, "with a senior defence source indicating that the tiltrotor is unable to perform some missions currently conducted using its Sikorsky CH-53 transport helicopters