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 methods to improve the Phantom's low-speed ride quality.
| Identifier | ExFiles\Box 68\2\ scan0237 | |
| 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. SECTION 1: EFFECT OF SHOCK ABSORBERS. - 4' REAR BUFFER CLCE. - 1.5' FRONT BUFFER CLCE. - TYRE PRESS. FRONT 40 LBS/□" REAR 35 LBS/□" - FRONT SPRINGS WELL LUBRICATED - REAR SPRINGS 250 LBS HYSTERISIS AFTER RUNNING 6 MONTHS (SEE CURVES ON SPRING REPORT) *Bar Labels (L-R):* 1. ALL SHOCK ABSORBERS ON. 2. REAR SHOCK ABSORBERS DISCONNECTED. 3. FRONT SHOCK ABSORBERS DISCONNECTED. 4. ALL SHOCK ABSORBERS DISCONNECTED. SECTION 2: EFFECT OF TYRE PRESS. - BUFFER CLCE. 4' REAR 1.5' FRONT - SHOCK-DAMPERS 65/80 FRONT 60/80 REAR. *Bar Labels (L-R):* 5. TYRE PRESS 40 LBS/□" FRONT. 35 LBS/□" REAR. 6. TYRE PRESS 35 LBS/□" FRONT. 25 LBS/□" REAR. 7. ALL TYRES 25 LBS/□" SECTION 3: EFFECT OF FRONT SPRING RATING. - REAR SPRINGS AS IN TEST 1/ -- Sub-section: STANDARD FRONT SPRINGS AS IN 1/ *Bar Labels (L-R):* 8. STANDARD DAMPERS AND TYRE PRESS. 9. FRONT DAMPERS OFF. 10. TYRES 25 x 35 LBS/□" FRONT -- Sub-section: FRONT SPRINGS 19% LOWER RATING. *Bar Labels (L-R):* 11. STANDARD DAMPERS AND TYRE PRESS. 12. FRONT DAMPERS OFF. SECTION 4: EFFECT OF REAR SPRING RATING. - FRONT SPRINGS AS IN TEST 1/ -- Sub-section: 4" BUFFER CLCE. ALL SPRINGS WELL GREASED. *Bar Labels (L-R):* 13. STANDARD DAMPERS & TYRE PRESSURES. 14. FRONT DAMPERS OFF. 15. TYRE PRESS 25 - 35LBS/□" FRONT -- Sub-section: 2.5" BUFFER CLCE. ALL SPRINGS WELL GREASED. *Bar Labels (L-R):* 16. STANDARD DAMPERS & TYRE PRESSURES. 17. FRONT DAMPERS OFF. 18. TYRE PRESS 25 - 35LBS/□" FRONT SECTION 5: BEST CONDITION STANDARD CAR. - REAR 4" BUFFER CLCE - FRONT 1.5 BUFFER CLCE - SPRINGS GREASED. - 19% LOWER RATING FRONT SPRINGS. *Bar Labels (L-R):* 19. STANDARD REAR HYDRAULICS. NO FRONT HYDRAULICS. 20. TYRES FRONT 25 & 35 LBS/□" | ||