Fairey Monarch

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P.24 Monarch
Fairey p24.jpg
Fairey P.24 at the Fleet Air Arm Museum
Type Piston H24 aero-engine
Manufacturer Fairey Aviation Company Limited
First run 1939
Major applications Fairey Battle
Developed from Fairey Prince (H-16)

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.[1]

Design and development[edit]

The P.24 Monarch was an enlarged development of the Prince, designed by chief engine designer Captain A.G. Forsyth.[2] 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, serial K9370, with its first flight taking place on 30 June 1939.[3]

At the request of the US, the engine - on the Battle[citation needed] - was sent to America where it was flown at Wright Field for evaluation.


Projected applications[edit]


  • P.24 Monarch or Prince 4

2,240 hp (1,670 kW)

Specifications (P.24 Monarch)[edit]

Data from Lumsden.[4]

General characteristics

  • Type: Liquid-cooled H24 engine
  • Bore: 5.25 in (133.35 mm)
  • Stroke: 6.0 in (152.4 mm)
  • Displacement: 3,117 in³ (51.08 L)
  • Length: 86.25 in (2191 mm)
  • Width: 43 in (1092 mm)
  • Height: 52.5 in (1333.5 mm)
  • Dry weight: 2,180 lb



  • Power output: 2,240 hp (1,670 kW) at 3,000 rpm at 9,000 ft

See also[edit]

Comparable engines
Related lists



  1. ^ Gunston 1989, p.56.
  2. ^ http://www.flightglobal.com/pdfarchive/view/1957/1957%20-%201853.html Capt. Forsyth Retires]
  3. ^ Lumsden 2003, p.149.
  4. ^ Lumsden 2003, p.150.


  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links[edit]