The Battle of Britain was the largest combat completely fought with planes. Germans used Messerschmitt Bf 109E and Bf 110C fight planes. On the other side, Britain or RAF used Hurricane Mk I and Spitfire Mk I. When the war broke out, the RAF had twice as much Hurricanes than Spitfires. Luftwaffe’s Bf 109E was 40 mph faster and had a better climb rate than Hurricane Mk I. In the spring and summer 1940, English planes were able to improve their speed, up to 30 mph and they had more power, thanks to 100 octane fuel. That improvement was called an ‘’Emergency Boost Override.’’ At the end of the 1940, from September, RAF started using Mk IIa series 1 Hurricanes. They had more power, but they entered into the battle in small numbers. Because of more power, they were able to reach 342 mph (550 km/h). That was 20 mph faster that previous models, but still 20 mph slower than German’s Bf109.
The Luftwaffe’s Bf 109 E was used as fighter-bomber because it could carry 250 kg bomb. They were able to fight on equal terms against RAF planes, but this was possible only when they released the bomb. At the beginning of the battle, the Germans had Messerschmitt Bf 110C. They were expected to engage air-to-air combat while they were escorting the bomber fleet. They were faster than Hurricane, but they had a lower acceleration and maneuverability, so they were considered as the failure as escort fighters. On august, 13th and 15th, 30 aircrafts were lost. That was equivalent to the entire ‘’Gruppe.’’ In the next two days, 8 and 15 more planes were lost.