The Blackburn F3 was a British single - engined fighter aircraft produced in response to Air Ministry Specification F.7 / 30 for a single - seat day and night fighter .
The Blackburn F3 was a British single - engined fighter aircraft produced in response to Air Ministry Specification F.7 / 30 . 
 Following the release of Air Ministry Specification F.7 / 30 for a single - seat day and night fighter .