How the Speed Spitfire’s Racing Merlin led to the development of the Merlin III powered by 100-octane fuel, the engine fitted to Spitfires and Hurricanes during the Battle of Britain – The Aviation Geek Club
The Merlin version which was being developed that would have taken advantage of 100-octane fuel was the Merlin III, which would be fitted to most Spitfires and Hurricanes during the Battle of Britain. Conceived to capture the world speed record just before the outbreak of World War II, the “Speed Spitfire” originated from a standard …