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).
Bar chart comparing tests to determine the best method of improving the Phantom's low-speed ride quality.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan040 | |
| Date | 17th September 1928 guessed | |
| TEST TO DETERMINE THE BEST METHOD OF IMPROVING THE PHANTOM LOW SPEED RIDING. ALL TESTS AVERAGE MAIN ROAD 23 M.P.H. 8 E.X. CAR. LIMOUSINE FRONT AXLE WT. 25 CWTS. REAR AXLE WT. 28 CWTS. COLUMN 1: EFFECT OF SHOCK ABSORBERS 4" REAR BUFFER CLCE. 1.5" FRONT BUFFER CLCE. TYRE PRESS. FRONT 40 LBS/SQ IN REAR 35 LBS/SQ IN FRONT SPRINGS WELL LUBRICATED REAR SPRINGS 250 LBS HYSTERISIS AFTER RUNNING 6 MONTHS (SEE CURVES ON SPRING REPORT.) Bars: - ALL SHOCK ABSORBERS ON - REAR SHOCK ABSORBERS DISCONNECTED. - FRONT SHOCK ABSORBERS DISCONNECTED. - ALL SHOCK ABSORBERS DISCONNECTED. COLUMN 2: EFFECT OF TYRE PRESS. BUFFER CLCE. 4" REAR 1.5" FRONT SHOCK DAMPERS 65/80 FRONT 60/80 REAR. Bars: - TYRE PRESS 40 LBS/SQ IN FRONT. 35 LBS/SQ IN REAR. - TYRE PRESS 35 LBS/SQ IN FRONT. 25 LBS/SQ IN REAR. - ALL TYRES 25 LBS/SQ IN COLUMN 3: EFFECT OF FRONT SPRING RATING REAR SPRINGS AS IN TEST 1/ STANDARD FRONT SPRINGS AS IN 1/ FRONT SPRINGS 19% LOWER RATING. Bars: - STANDARD DAMPERS AND TYRE PRESS. - TYRE PRESS 25 LBS/SQ IN - FRONT DAMPERS OFF. - STANDARD DAMPERS AND TYRE PRESS. - TYRES 25 & 35 LBS/SQ IN - FRONT DAMPERS OFF. COLUMN 4: EFFECT OF REAR SPRING RATING FRONT SPRINGS AS IN TEST 1/ 4" BUFFER CLCE 2.5" BUFFER CLCE. ALL SPRINGS WELL GREASED. Bars: - STANDARD DAMPERS & TYRE PRESSURES. - TYRE PRESS 25 & 35 LBS/SQ IN - FRONT DAMPERS OFF. COLUMN 5: BEST CONDITION STANDARD CAR. REAR 4" BUFFER CLCE FRONT 1.5" BUFFER CLCE SPRINGS GREASED. 19% LOWER RATING FRONT SPRINGS. Bars: - STANDARD REAR HYDRAULICS. - NO FRONT HYDRAULICS. - TYRES FRONT 25 & 35 LBS/SQ IN Y-Axis Scale: 10, 20, 30, 40, 50, 60, 70, 80 | ||