Attempting to gain a share of the post-World War II demand for civil airliners, the Glenn L. Martin Company flew on 22 November 1946 the prototype of a twin-engine 36/40-seat transport designated Martin 2-0-2. The first of these entered service in October 1947, but the loss of a 2-0-2 in 1948 as a result of wing structural failure led to modification of other in-service aircraft and production of this version was brought to an end. The prototype of an improved Martin 3-0-3 had been flown on 20 June 1947, but with a need to redesign the wing structure it was decided instead to develop a new Martin 4-0-4. This incorporated the wing structural revisions and introduced a pressurised and slightly lengthened fuselage, accommodating as standard a crew of three or four and 40 passengers. When production ended in early 1953 a total of 103 had been built, this number including two supplied to the Coast Guard as staff transports under the designation RM-1G (later RM-1Z and finally VC-3A); they were subsequently transferred to the US Navy.

3-View

A three-view drawing (672 x 940)