High Quality Content by WIKIPEDIA articles! The Fairey P.24 Monarch or Prince 4 was a British experimental 2,000 hp (1,490 kW) class H-24 aircraft engine designed and built by Fairey in the late 1930s. The engine did not go into production. The P.24 Monarch was an enlarged development of the Fairey Prince (H-16) by Captain A.G. Forsyth who was the Fairey company's chief engine designer. Similar in layout to the Napier Dagger the cylinders were arranged vertically in two separate blocks, driving contra-rotating propellers via separate shafts and gears. Like the smaller Prince engine each bank of cylinders could be shut down in flight to drive only one propeller, an idea that was reused much later in the Armstrong Siddeley Double Mamba turboprop. The engine was test flown in a Fairey Battle, K9370, with its first flight taking place on 30 June 1939.

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