Bristol Hercules

The Bristol Hercules was a 14-cylinder two-row radial aircraft engine
designed by Sir Roy Fedden and produced by the Bristol Engine Company starting in 1939.
It was the most numerous of their single sleeve valve (Burt-McCollum, or Argyll, type) designs, powering many aircraft in the mid-World War II timeframe.
The Hercules powered a number of aircraft types, including Bristol's
own Beaufighter heavy fighter design, although it was more commonly used on bombers.
The Hercules also saw use in civilian designs, culminating in the
735 and 737 engines for such as the Handley Page Hastings C1 and C3 and Bristol Freighter.