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).
Letter providing instructions and expected data for testing an oil relay's movement under specific conditions.
| Identifier | ExFiles\Box 71\4\ scan0137 | |
| Date | 16th April 1925 | |
| X8940 Expl: Dept: Messrs. Rolls-Royce Ltd., Derby Angleterre. 16th. April 1925. Hotel de France, Chateauroux, Indre, France. Mr. Hancock from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} We are anxious to obtain data as to how the relay is maintaining its efficiency under severe running conditions. We are sending out with Marsden a lever and quadrant to be attached to the relay as indicated in the sketch. We suggest that you raise the oil temp. to 70°C, jack up the rear wheels, and observe the movement of the lever on the quadrant at various engine speeds. We give a table of the movements we expect for given speedometer readings in 3rd. gear. 3rd. M.P.H. Angular movement Engine Road speed. of lever E.72518. R.P.M. 10 2° 517 12 2.5° 620 15 4.2° 775 20 7.8° 1034 25 11.6° 1290 30 15.4° 1551 35 18.3° 1810 40 21.5° 2068 45 24.0° 2325 Oil relay movement - 15 tooth axle - oil temp. 70°C - 3rd. gear. contd :- | ||