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 plotting brake drum cooling rate against car speed for a 4G30 chassis under various configurations.
| Identifier | ExFiles\Box 120\1\ scan0311 | |
| Date | 12th February 1941 | |
| Handwritten note: RM{William Robotham - Chief Engineer}/JH/K/R 12-2-41 Top X-Axis: SPEED IN MILES PER HOUR. Values: 60, 40, 20, 0 Right Y-Axis: COOLING RATE AT 150°C IN °C PER MINUTE. Values: 10, 20, 30, 40, 50 Bottom Title: BRAKE DRUM COOLING AGAINST SPEED OF CAR. 4G30 CHASSIS FIGURE 1. Legend: 1. O.S.F. 2. O.S.R. AIR-DEFLECTOR - NO COWL. 4 NOTCHES ON ADJUSTER OK. 3. " 4. " 5. " COWL FITTED 6. " COWL FITTED - NO AIR-DEFLECTOR Text associated with dashed line: O.S.F. 11 & Y | ||