From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint detailing gun specifications and the wing planform for an aircraft.
| Identifier | ExFiles\Box 176\1\ img034 | |
| Date | 17th July 1940 guessed | |
| 7-8 .5% GUNS 274 ROUNDS OF AMMUNITION PER GUN. RATE OF FIRE 1030 ROUNDS PER MINUTE PER GUN. MUZZLE VELOCITY 2500 FT/SEC. | ||