Martin Models 69, 73 and 74

SC-1 and 2, T3M-1 and 2, T4M-1 Patrol Planes
T4M Variants/Specifications
SC-1/SC-2/T3M Variants/Specifications

The trickle of small orders became a flood in late 1924 when Martin underbid Curtiss on a contract for quantity production of a Curtiss-designed scout bomber. Originally designated CS-1 (for Curtiss Scout) the Martin version simply reversed the letters to become the SC-1. A large biplane often described as a "three-purpose plane" - torpedo-bomber-scout - the CS/SC and its successors, the T3M, T4M, and TG, proved remarkably durable.

By 1928, Martin's Cleveland factory was booming, with a workforce that topped 1,000 men. At this point Glenn Martin sold both factory and designs to Detroit Aircraft, which organized a Cleveland subsidiary, the Great Lakes Aircraft Company.