 If the pilot resorted to emergency boost, he had to report this on landing and it had to be noted in the engine log book.In 1939, the RAF had taken on about 500 of this later design to form the backbone of the fighter squadrons during the Battle of France and into the Battle of Britain.The first RAF ace of the war, a young New Zealander known as "Cobber" Kain, flew a Hurricane with No.