Jacobs R-755-9

Shakin’ Jake

Also known as the L-4, the Jacobs R-755 became widely used in various American aircraft during the Second World War period. One of four contenders for the mid-size radial market, Jacobs’ seven cylinder engine was used in the late 1930s in private aircraft like the Beech Staggerwing and the Spartan Executive. When war came, the Jacobs cross into the broader market as the engine of choice on the Cessna T-50, which went to war as a utility transport under the designations of AT-17 and UC-78 Bobcat, as well as the subsequent Cessna 190 and 195. The engine earned the 1940s nickname of the “Shakin’ Jake.”