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There were three sub-variants for low altitude (LF Mk VIII), medium altitude (F Mk VIII) and high altitude (HF Mk VIII) which were powered respectively by the Merlin 66, Merlin 63 and Merlin 70 engines. [23] Spitfire Mark VIII taxies to the end of the Red Road airstrip in Calcutta, India.
A variant of the Merlin XX fitted with single-stage, single-speed supercharger for low altitude Spitfire use. First production Merlin 45 delivered 13 January 1941. [6] First of specialised engines for Spitfire Mk V variants and early Seafires. Merlin 45M 1,230 hp (917 kW) at 3,000 rpm
A.P 1565B Spitfire IIA and IIB Aeroplanes: Merlin XII Engine, Pilot's Notes (July 1940). London: Air Data Publications, 1972 (reprint). ISBN 0-85979-043-6. Air Ministry. Pilot's Notes for Spitfire Mark F.VII – Merlin 64 or 71 engine; Mark F.VIII – Merlin 63,66 or 70 engine. Air Publication 1565G & H -P.N. London, UK: Air Ministry, December ...
Depending on the supercharger fitted, engines were rated as low altitude (e.g.; Merlin 66, Griffon III), where the engine produced its maximum power below about 10,000 feet (3,000 m), medium altitude (Merlin 45), where the engine produced its maximum power up to about 20,000 feet (6,100 m), and high altitude (Merlin 70), where the engine produced its maximum power above about 25,000 feet ...
Supermarine Spitfire variants powered by early model Rolls-Royce Merlin engines mostly utilised single-speed, single-stage superchargers. The British Supermarine Spitfire was the only Allied fighter aircraft of the Second World War to fight in front line service from the beginnings of the conflict, in September 1939, through to the end in ...
Spitfire 944; Supermarine Speed Spitfire; Supermarine Spitfire (early Merlin-powered variants) Supermarine Spitfire (Griffon-powered variants) Supermarine Spitfire (late Merlin-powered variants) Supermarine Spitfire operational history; Supermarine Spitfire prototype K5054; Supermarine Spitfire variants: specifications, performance and armament
The Merlin 65 series engine was used in all the prototypes as it was identical to the Merlin 66 powering the Spitfire Mk IX, allowing for a closer comparison. Due to the speed of the conversions, engines were often swapped from aircraft to aircraft as well as being replaced by newer units.
Supermarine Spitfire; Supermarine Spitfire (early Merlin-powered variants) Supermarine Spitfire (late Merlin-powered variants) Supermarine Spitfire (Griffon-powered variants) Supermarine Seafire; Supermarine Spitfire prototype K5054; Supermarine Aircraft Spitfire