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).
The performance test results for a Hispano servo motor after restoration.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan127 | |
| Date | 20th March 1924 | |
| R.B. 465a (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT Expl. No. 1559 4214 REF: HISPANO SERVO MOTOR. It was found after previous tests on this servo that the braking on the car was not up to its usual standard. The output of the servo has now been restored to normal by carefully bedding the lining and 'running in' on the road. The following figures give the output of the servo working with its normal efficiency :- | Eqvt. pedal pressure. lbs. | Torque input. | Total torque output. | Torque given by servo. | Total output (torque) / Torque input | |---|---|---|---|---| | 12 | 144 | 867 | 723 | 6.0 | | 18 | 216 | 1610 | 1394 | 7.5 | | 24 | 288 | 2290 | 2002 | 7.9 | | 30 | 360 | 2790 | 2430 | 7.7 | | 36 | 432 | 3160 | 2728 | 7.3 | | 42 | 504 | 3410 | 2906 | 6.8 | | 48 | 575 | 3560 | 2985 | 6.2 | Hs{Lord Ernest Hives - Chair}/ACL. | ||