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).
Graph detailing alternative gun installations for a Spitfire aircraft.
| Identifier | ExFiles\Box 176\1\ img030 | |
| Date | 17th July 1940 guessed | |
| ALTERNATIVE GUN INSTALLATION FOR SPITFIRE AIRCRAFT Based on Weight of existing 8 - .303 Browning Guns + 300 Rounds per gun). Curve Labels: Energy per Second. Total Available Energy Energy per Round No. of Guns. Rounds of Ammunition Axis Labels (Right Side): No. of Guns. Rounds of Ammunition Muzzle Energy per round Muzzle Energy per second Total Avail. Energy ft. lbs Horizontal Axis Scale (No. of Guns): 1, 2, 3, 4, 5, 6, 7, 8 Vertical Axis Scales: (Rounds of Ammunition): 300, 600, 900, 1200, 1500, 1800, 2100, 2400 (Muzzle Energy per round): 2,000, 4,000, 6,000, 8,000, 10,000, 12,000, 14,000, 16,000 (Muzzle Energy per second): 10,000, 20,000, 30,000, 40,000 (Total Avail. Energy ft. lbs): 200,000, 400,000, 600,000, 800,000, 1,000,000, 1,200,000, 1,400,000, 1,600,000 | ||