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).
Responding to feedback on a new 20/25 HP chassis, addressing brake performance, oil leakage, and proposed improvements.
| Identifier | ExFiles\Box 107\1\ scan0289 | |
| Date | 29th April 1935 | |
| +560 Sg.{Arthur F. Sidgreaves - MD} from Wor.{Arthur Wormald - General Works Manager} e.{Mr Elliott - Chief Engineer} to S. o.{Mr Oldham} to H.{Arthur M. Hanbury - Head Complaints} c. to Hs.{Lord Ernest Hives - Chair} Worl/R.29.4.35. Re: Your new 20/25 - Sg{Arthur F. Sidgreaves - MD}16/E25.4.35. I note from the first paragraph of your memo that during Easter you went a little trip of about 650 miles, and that, generally speaking, you were delighted with the chassis with the exception of the brakes. I will now deal with the points set out in the remaining paragraphs of your memo:- Paragraph 2. There were no special efforts made to pick out units for your chassis; as a matter of fact all units were those which were erected in the chassis in the first instance. Paragraph 4. Torque Re-action Dampers are not fitted to your chassis. Paragraphs 5, 6 and 7. Brakes. The Test Department inform me that these were quite satisfactory, and up to the standard for the 20/25 H.P. Archer states that when the final test of the complete car was undertaken by both JLE.{J. Lee Evans - Chassis Test Manager} and himself the brakes were thought to be particularly good, but in view of the trouble that had recently been experienced by you with oil getting on to the front brakes of Trials Car - GSF-4 - it was considered advisable to examine the front brakes for any signs of a similar trouble; this was done, and the brakes were found to be free from oil. Regarding the rear brakes, it is possible some oil may have got on to these from the rear actuating shaft. A modification which has been long needed is now standard to prevent excess of oil from the lubrication scheme getting on to the rear brake linings. This scheme did not come into force until after your chassis was delivered. As this scheme is not easily applied to an existing axle, we are sending to N. a present type rear axle, on which this scheme is embodied. This axle is leaving to-day for fitting to your car. Dealing with the improvements set out in Worl/R.{Sir Henry Royce} 15.4.35., viz;- (1) 35° instead of 45° servo cam. This should give an increase of 43% in the servo multiplication of torque. (2) Fully floating linings which are more likely to be consistent than with the present scheme. | ||