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).
Tests conducted to alleviate engine boiling troubles during hill climbs using indirect gears.
| Identifier | WestWitteringFiles\L\2July1924-September1924\ Scan19 | |
| Date | 8th September 1924 | |
| R.R. 403A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Exptl. No. REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG18.9.24. ALLEVIATING BOILING TROUBLES BY HILL CLIMBING ON INDIRECT GEARS. These tests were under-taken to confirm the results obtained on the dynamometer. An endeavour was made to discover the most satisfactory combination of throttle opening and gear to minimise the possibility of over-heating. The car was loaded up to 55 cwts. and a portion of the radiator blanked off to ensure an adequate rise in temperature during the tests. This should in no way affect the results, which are purely comparative. The hill was climbed initially at a fixed road speed on various gears. Under these conditions the same amount of work was done in the same time each climb, neglecting transmission losses and the small amount of extra work done on the lower gears turning the engine over at a higher speed. Full throttle was required on top gear while partial throttle sufficed on the other gears. Under these <strikethrough>conditions</strikethrough> circumstances, as shewn by the dynamometer tests, slightly more heat would be lost to the cooling water on the indirect gears due to the work being done on reduced throttle. Against this increase loss in the cooling water, we have the increased speed of the fan on the indirect gears. Graph A.{Mr Adams} shews the increased fan speed to be more beneficial, than the increased heat loss to the cooling water is detrimental, to the cooling of the car, for the finishing temperature on 3rd. is definitely lower than that on direct drive. contd :- | ||