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).
Calculation of the effective pressure on the rear brakes for the Standard 40-50 RR and Goshawk models.
| Identifier | ExFiles\Box 30\6\ Scan150 | |
| Date | 15th January 1924 guessed | |
| PRESS. ON REAR BRAKES OF STD 40-50 RR. [Diagram values]: P, 14.75, 6.18, 1.4, 1.9, 2.0, 2.5, 7", .5 CAM RAD. EFFECTIVE PRESS. AT SHOES = (P 14.75 x 1.4 x 2 x 7 x 1 x .2) / (6.187 x 1.9 x 2.5 x 1 x 2 x .09) = 10.95 P PRESS. ON REAR BRAKES OF GOSHAWK [Diagram values]: P, 12.75, 4.6, 2.5, 3.5, 6", 2.3, 2.5, .43 CAM RAD. RATIO OF PRESS AT CENTRE CROSS TO PRESS AT CAM. EFFECTIVE PRESS AT SHOES = (P 12.75 x 2.5 x 6 x 2.5 x 1 x (12.15)) / (4.6 x 3.5 x 2.3 x .86 x 2 x (6.2)) = 15.19 P | ||