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).
Test data for a Hispano servo, focusing on the ratio of torque output to input.
| Identifier | ExFiles\Box 22\1\ Scan151 | |
| Date | 11th March 1924 | |
| H.R. 493 (40 H) (SL 42 12-7-23). J.H.D. 4214 EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR.{Arthur Wormald - General Works Manager} By.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} EP.{G. Eric Platford - Chief Quality Engineer} PN.{Mr Northey} OY. Expl. No. 4214 1559 REF. Hs{Lord Ernest Hives - Chair}/ACL1/LG11.3.24. OBJECT OF TEST. Data of Hispano servo. TESTER. A.{Mr Adams} C. Lovesey. CONDITIONS. Tests made with engine on test bench. SUMMARY OF TEST. Ratio of torque output to torque input. Experiments made over a range of loads equivalent to pedal pressures from 15 lbs. to 100 lbs. and an equivalent car speed of approx. 30 M.P.H. Torque output - In these results - Torque output = torque given by servo + torque input. RESULTS :- | Ratio torque output / torque input | Value of μ from results. Max. value reached. | 10 | .57 Min. value reached. | 3 | .28 Average value. | 4 | .36 contd:- | ||