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).
Requesting a comparison of oil pressure recovery after braking under different filter arrangements for models 6.B.IV and 35-EX.
| Identifier | ExFiles\Box 83\1\ scan0403 | |
| Date | 13th March 1937 | |
| To Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/IMW.{Ivan M. Waller - Head of Chateauroux} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. to Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} 200a. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/AP.13.3.37. 6.B.IV. and 35-EX. We thank you for your memo Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/IMW{Ivan M. Waller - Head of Chateauroux}/3/JAB.10.3.37. regarding the information on the characteristics of the recovery of oil pressure after braking hard on 6.B.IV. As the external filter and pump arrangement are to be standardised will you please carry out the following comparisons of pressure recovery after braking. 1. In present form. 2. With the filter element removed (when this is removed the pot should be thoroughly cleaned of sludge etc., otherwise will go through to the bearings. 3. Short circuiting the filter completely by fitting a standard direct pipe from the pump to the crankcase feed face. We will send out a pipe for this job. The information required under the (3) conditions are curves of pressure against time something after the following, and any other detail information you can give. [Graph with Y-axis labelled 'Oil Press lbs/sq in' from 10 to 40, and X-axis labelled 'Secs' from 0 to 35. It shows a line starting high, dipping down during 'BRAKING FROM (MPH)', and then rising during 'Brakes Released And Accel( MPH)'.] If the above is carried out giving mph. at intervals of time together with oil press. then this will be very useful to us. Comparative curves of braking from different speeds and accelerating away fast, also if engine is idled after braking to be included. continued | ||