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).
Chart comparing road test results at 23 M.P.H. for different vehicle configurations.
| Identifier | ExFiles\Box 67a\1\ scan0162 | |
| Date | 23th April 1926 guessed | |
| ROAD SPEED ALL TESTS 23 M.P.H. TEST I COMPARISON OF EFFECT OF ALTERING FRONT SUSPENSION OF CAR ON RIDING IN REAR SEATS 40/50 "PHANTOM" CAR 44 P.K. LIMOUSINE REAR SHOCK ABSORBERS 25 LBS. FRICTION TYRE PRESS: FRONT 40 LBS/D" REAR 45 LBS/D" STANDARD REAR SPRINGS. A: 48 c.c. LOST - 17% WEAKER FRONT SPRINGS (BALL BEARINGS) NO INTERNAL FRICTION PRE FRONT WHEEL BRAKE AXLE HYDRAULIC SHOCK DAMPERS FRONT B: 54 c.c. LOST - STANDARD FRONT SPRINGS. STANDARD FRICTION WELL OILED SPRINGS. FRONT WHEEL BRAKE AXLE. TEST II EFFECT OF ALTERING TYRE PRESSURES. CONDITIONS AS IN TEST A.I. EXCEPT FOR TYRE PRESSURES. 19 c.c. - TYRES 25 & 30 LBS/D" 48 c.c. - TYRES 40 & 45 LBS/D" TEST III EFFECT OF DISPLACING CAR C OF G WITH BALLAST OPEN TOURING CAR 6.75 BALLOON TYRES AT 40 & 45 LBS/D" REAR SHOCK ABSORBERS 25 LBS: HYDRAULIC FRONT SHOCK ABSORBERS STANDARD SPRING DEFLECTIONS A: 65 c.c. - STANDARD TOURING CAR 2 PASS. 58 c.c. - 2 PASS 500 LBS: BALLAST IN REAR OF CAR. 40 c.c. - 2 PASS 500 LBS: BALLAST 5 FT. BEHIND REAR WHEEL CENTRES. TEST IV COMPARISON OF RIDING OF DIFFERENT CARS. TYRE PRESSURES 45 LBS/D" FRONT 40 LBS/D" REAR 9 c.c. - 20 H.P. R.R. LANDAULETTE. STANDARD SHOCK ABSORBERS. 40 c.c. - SILVER GHOST Pre FRONT WHEEL BRAKE LANDAULETTE. REAR ABSORBERS 25 LBS. FRONT 25 LBS. 54 c.c. - 40/50 PHANTOM LIMOUSINE. STANDARD SPRINGS. REAR SHOCK ABSORBERS 25 LBS. FRONT SHOCK ABSORBERS HYDRAULIC 25 & 75 102 c.c. - HISPANO NO SHOCK ABSORBERS. | ||