Hand-drawn diagrams and calculations for rear brake pressure on the STD 40-50 RR and Goshawk models.
| Identifier | ExFiles\Box 73\1\ scan0082 | |
| Date | 22th January 1924 guessed | |
| PRESS. ON REAR BRAKES OF STD 40-50 RR. P 14.75 6.18 1.4 1.9 2.0 2.5 7" 1.5 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(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) P 12.75 4.6 2.5 3.5 6" 2.3 2.5 .43 CAM RAD. RATIO OF PRESS AT CENTRE PRESS 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 | ||
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).