Bar chart comparing test results for different methods of improving the Phantom's low-speed ride quality.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan028 | |
| Date | 10th 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. 1/ EFFECT OF SHOCK ABSORBERS. 4" REAR BUFFER CLCE. 1.5" FRONT BUFFER CLCE. TYRE PRESS. FRONT 40 LBS/SQ" REAR 35 LBS/SQ" FRONT SPRINGS WELL LUBRICATED REAR SPRINGS 250 LBS HYSTERISIS (Handwritten note: 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. 2/ EFFECT OF TYRE PRESS. BUFFER CLCE. 4" REAR 1.5" FRONT SHOCK DAMPERS 60/80 FRONT 60/80 REAR BARS: TYRE PRESS 40 LBS/SQ" FRONT. 35 LBS/SQ" REAR TYRE PRESS 35 LBS/SQ" FRONT. 25 LBS/SQ" REAR ALL TYRES 25 LBS/SQ" 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. FRONT DAMPERS OFF. TYRE PRESS 25 & 35 LBS/SQ" STANDARD DAMPERS AND TYRE PRESS. FRONT DAMPERS OFF. TYRES 25 & 35 LBS/SQ" 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. FRONT DAMPERS OFF. TYRE PRESS 25 & 35 LBS/SQ" STANDARD DAMPERS & TYRE PRESSURES. FRONT DAMPERS OFF. TYRE PRESS 25 & 35 LBS/SQ" 5/ BEST CONDITION STANDARD CAR. REAR 4" BUFFER CLCE. FRONT 1.5" BUFFER CLCE. SPRINGS GREASED. (Handwritten note: 19% LOWER RATING FRONT SPRINGS) BARS: STANDARD REAR HYDRAULICS. NO FRONT HYDRAULICS. TYRES FRONT 25 & 35 LBS/SQ" REAR | ||
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).