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 a schematic for a Spitfire aircraft.
| Identifier | ExFiles\Box 176\1\ img039 | |
| Date | 1st March 1940 guessed | |
| 2 - 19.5 m/m GUNS 135 ROUNDS OF AMMUNITION PER GUN RATE OF FIRE 480 ROUNDS PER MINUTE PER GUN. MUZZLE VELOCITY 2880 FT/SEC N FOR SPITFIRE AIRCRAFT. ING GUNS + 300 ROUNDS PER GUN | ||