Aircraft Engine Company was formed in 1929 in
Philadelphia. Later the company moved to Pottstown,
product was a small 55 hp 3 cylinder engine. By 1933, Jacobs
had developed its most famous engine, the L-4, better known as by
its military designation, the R-755.
War II, Jacobs became a division of Republic Industries (not
Republic Aircraft). Jacobs type certificates are currently held by Air