Welch Aircraft Motors of Anderson, Indiana developed a two-cylinder horizontally-opposed Welch engine in 1934, principally for use in their own aircraft designs.
O-135 -- {4.5 / 4.25 / 135.2} / {114.3 / 108.0 / 2215}
2cyl; O-2; 41hp@2300rpm-45@2500; 1934-1941; Wt = 115#; TC = none.
Single-ignition engine.
Ae39; J7.
Applications: (US) Welch OW-7M.