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).
Testing of Hispano brakes on a car running backwards on a gradient.
| Identifier | ExFiles\Box 22\1\ Scan082 | |
| Date | 30th January 1924 | |
| Y4214 CJ. from Hs.{Lord Ernest Hives - Chair} Hsl/LG30.1.24. HISPANO BRAKES. CJ5/E29.1.24. Y4214 / Y1589 / Y487 With reference to your request that we should test the Hispano brakes with the car running backwards on a gradient of 1 in 5. We have sent a 40/50 RR. car fitted with 4-wheel brakes and the Hispano car to Porlock and the adjacent hills. The tests set out include holding the car from running backwards on gradients. We have previously carried out tests on the Hispano and found that if the car was running back at 10 m.p.h. with the maximum pedal pressure, the car could be held on a gradient of 1 in 7. Hs.{Lord Ernest Hives - Chair} | ||