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).
Programme of test bed work for a Wraith No.2 unit, detailing tests on gears, damper loadings, and oil heat flow.
| Identifier | ExFiles\Box 155\2\ scan0108 | |
| Date | 30th June 1937 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} c. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/AP.30.6.37 PROGRAMME OF TEST BED WORK. Further to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}12/JH.24.6.37 No.30 Bed. Wraith No.2. Unit. Tests to be carried out are as follows:- (1) HPS.{Horace Percy Smith - Experimental Factory Mgr} to quieten gears which at present whine, then check for rattle experienced on No.1. unit at 850 R.P.M. also for the period at 2300 R.P.M. (2) Failing to get these periods, fitters to make backlash to same figures as No.1. unit and again check. (3) Try effect of various damper loadings by adjusting washers 5 lbs - 35 lbs. on 2300 R.P.M. period. (4) Heat Flow to oil - This to be carried out in the following manner:- (a) Remove the lower half and fit a suction pipe which comes through the lower half, the suction strainer off the base of the sump being removed. (b) At the end of the protruding suction pipe attach Ph.III. oil cooler complete with case for water cooling. From the other side of the cooler extend a pipe into an oil tray below the sump in such a position that it is possible to measure the quantity of oil draining from the sump. Figures required at a constant speed of 4000 R.P.M. full throttle are as follows - 1st. Series. Without test bed cooler and filter in circuit, pipe from sump to engine filter as installed in the chassis. With suction oil controlled to 90°C. check following temperatures - continued | ||