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).
Recommendations following a 10,000-mile test on the flywheel, clutch, servo, radiator, and thermostat.
| Identifier | ExFiles\Box 82\1\ scan0334 | |
| Date | 19th December 1933 | |
| x4513a To Mr. [redacted] from E.{Mr Elliott - Chief Engineer} c. Mr. E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} [redacted] Mr. [redacted] [redacted] re Report on 1.B.4. after 10,000 mile test. E.3/HP.19.12.33. Referring to the above and to memo sg.{Arthur F. Sidgreaves - MD}10/E.15.12.33, a meeting was held of Hs.{Lord Ernest Hives - Chair} Bn.{W.O. Bentley / Mr Barrington} E.{Mr Elliott - Chief Engineer} and GWH{George W. Hancock - Head Chateauroux} to discuss recommendations following the 10,000 mile test results. These are set out as follows, and the items mentioned in sg.{Arthur F. Sidgreaves - MD}10/HP.15.12.33 are taken first, so as to provide initially an answer to this particular memo. (1) Flywheel and Clutch. This clutch was fitted with material RAD.13 and it was found that this powdered away due to the effect of the sharply chamfered edges of the clutch plate slits. The clutch plate was standard and is like what we normally use on 20/25 production. All further wear ceased when the chamfered edges were rounded. Material RAD.13 has now been deleted and we have gone back to Ferodo Asbestos RAD.2. which we know is satisfactory with the standard plate. RAD.13 is not being used by anybody on clutches and it was only introduced at the time when we were suffering from slipping on the 20/25 clutches. In any case the radiusing on the edges of the clutch driven plate appears to be an advantage and might be adopted as standard. (2) Servo. The weakness reported under this heading refers to wear on the outboard support. We cured this on the P.2.chassis by adopting a ball bearing at this point. We can see no alternative but to repeat this on the Bentley and also the 20/25 as there is inadequate room for a plain bearing of sufficient dimensions and no lubrication can be tolerated at this point owing to its interference with the action of the servo. A design will be issued for this at the earliest possible moment. With regard to the servo itself, the fully floating type has proved to be quite satisfactory. (3) Radiator and Thermostat. An alteration has been instructed to the leverages | ||