Early Engines
An early product was the Jacobs L-3, a small 55 hp 3 cylinder engine of 1929 (4.125x4.75=190cuin).
By 1933, Jacobs had developed its most famous engine, the L-4 seven-cylinder radial air cooled engine with a power rating of 225 horsepower and a displacement of 757 cubic inches (12.4 litres). It was better known as by its military designation, the R-755 . At the time they became known as the best producers with their engines in the 200-400 horsepower range. Jacobs were the first to start making their engines using forged aluminum pistons, sodium-filled exhaust valves and magnesium alloy crankcases.
The L-4 was used mostly on the Cessna UC-78 Bobcat, Cessna 195 and Stearman PT-18 Kaydet
Due to their engines tendency to vibrate heavily at low rpms it was given the nicknames Shakin Jake and Shakey Jake .
Read more about this topic: Jacobs Aircraft Engine Company
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