While the introduction of the Merlin engine did improve the Mustang's performance and produce the bubble-canopied fighters with which we associate the name, credit must be given to theWhile the introduction of the Merlin engine did improve the Mustang's performance and produce the bubble-canopied fighters with which we associate the name, credit must be given to theWhile the introduction of the Merlin engine did improve the Mustang's performance and produce the bubble-canopied fighters with which we associate the name, credit must be given to the