Piston engines powered every significant Second World War air battle. Calum Douglas, who has written a brilliant book on the race for engineering supremacy, joins Al Murray and James Holland to explore the story of the men at the forefront of the battle.
Al and James discuss the fundamental differences between being a Luftwaffe pilot and an airman in the RAF. Also, why did it take so long to train a naval officer? Could it be due to the cost of the kit