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).
Inefficiency and weaknesses of a re-built Hispano servo motor during testing.
| Identifier | ExFiles\Box 22\1\ Scan164 | |
| Date | 29th April 1924 | |
| Y4214 To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} WOR.{Arthur Wormald - General Works Manager} SECRET. Hs{Lord Ernest Hives - Chair}1/LG29.4.24. HISPANO SERVO MOTOR. X.1559. X.4214 As pointed out in a previous report, when the Hispano unit was re-built we could not get any braking owing to the inefficiency of the servo. The previous figures given for the efficiency of the Hispano servo were taken with the servo in its ineffective condition. The figures attached were taken with the servo in a normal powerful condition. These tests show a weakness in the Hispano servo insomuch as its efficiency depends so much on the bedding and wrapping of the shoes. Hs.{Lord Ernest Hives - Chair} | ||