No. of cylinders: 12

Compression Ratio: 5.1

Cubic Capacity: 27 litres

Combat R.P.M: 3,000

Combat Power: 1030 Hp at 3000 RPM Plus 5 1/4 lb Boost

Altitude at which engine would give 1,000 Hp at full throttle & 3,000 RPM: 16,000 FT

Operating Altitudes: Sea level to 32,000 FT.

Military Aircraft using the Rolls Royce Merlin MK III: Hurricane, Spitfire, Boulton Paul Defiant, Hawker Henley and Fairey Battle.