Sound cutting out when diving

[RickRuski]

Sound cutting out on the early RR engines was a known fact with pilots in the Spits and Hurricanes, it didn't happen with the 109's because of the fuel injected engine. The RR engines were carb fuel fed and cut out when the nose of the aircraft was pushed down with the joystick. This was a fault that the 109 pilots knew about and used to their advantage. The problem was initially over come by fitting a washer if I remember correctly about the size of a penny (old coinage) into the carb with a hole in it (this allowed the fuel to pass through but was small enough to stop the fuel draining back when the aircraft was put into a dive. Hence the knick name "Miss Penny's orifice", later engines became fuel injected as technology developed.