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 and poundage requirements for a 'Phantom' servo swinging link with a spring-loaded friction device.
| Identifier | ExFiles\Box 67\1\ scan0065 | |
| Date | 4th May 1927 | |
| Hs.{Lord Ernest Hives - Chair} from Mx.{John H Maddocks - Chief Proving Officer} X8370 Mx{John H Maddocks - Chief Proving Officer}11/T4.5.27 SERVO SWINGING LINK WITH SPRING LOADED FRICTION DEVICE. "PHANTOM" The poundage called for on the end of the above link is 25 lbs. We are unable to obtain this poundage without the spring being practically choc a bloc. We have been over the various parts, and find that they are all to Drawing including the spring. We can obtain the poundage quite easily by roughing up the metal surfaces in contact by fine sand blasting, this was carried out on one set just as a test. From our experience so far, we believe we shall require more than 25 lbs. in a number of cases, at the moment however, we are not certain on this point. Mx.{John H Maddocks - Chief Proving Officer} | ||