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Battle of Britain

The Battle of Britain.The RAF's workhorse Hurricane Mk I and the less numerous Spitfire Mk I; Hurricane
outnumbered Spitfires in RAF Fighter Command by about 2:1 when war broke out.
The Bf 109E had a better climb rate and was up to 40 mph faster in level flight than the Rotol
(constant speed propellor) equipped Hurricane Mk I, depending on altitude.
The speed and climb disparity with the original non-Rotol Hurricane was even greater.
By the end of spring 1940, all RAF Spitfire and Hurricane fighter squadrons converted to 100
octane aviation fuel, which allowed their Merlin engines to generate significantly more power
and an approximately 30 mph increase in speed at low altitudes through the use of an Emergency
Boost Override.In September 1940, the more powerful Mk IIa series 1 Hurricanes started entering service
in small numbers. This version was capable of a maximum speed of 342 mph (550 km/h),
some 20 mph more than the original. non-Rotol) Mk I, though it was still 15 to 20 mph slower than a Bf 10

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