Blueprint chart comparing vehicle ride quality results from four different road tests conducted at 23 M.P.H.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan039 | |
| 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. Bar A: 48 C.C. LOST - 17% WEAKER FRONT SPRINGS. NO INTERNAL FRICTION (BALL BEARINGS) PRE FRONT WHEEL BRAKE AXLE. HYDRAULIC SHOCK DAMPERS FRONT Bar B: 54 C.C. LOST - STANDARD FRONT SPRINGS. STANDARD FRICTION WELL OILED SPRINGS. STANDARD FRONT WHEEL BRAKE AXLE. TEST II EFFECT OF ALTERING TYRE PRESSURES. CONDITIONS AS IN TEST I. EXCEPT FOR TYRE PRESSURES Bar 1: 19 CC - TYRES 25 & 30 LBS./D" Bar 2: 48 CC - TYRES 40 & 45 LBS./D" Bar 3: 65 CC TEST III EFFECT OF DISPLACING CAR C. OF G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 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 Bar 1: 58 CC - STANDARD TOURING CAR A 2 PASS. Bar 2: 66 CC - 2 PASS. 500 LBS. BALLAST IN REAR OF CAR Bar 3: 40 CC - 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 Bar 1: 9 CC - 20 H.P. R.R. LANDAULETTE STANDARD SHOCK ABSORBERS Bar 2: 40 CC - SILVER GHOST(1907 40/50 historic RAC 15,000 miles trial) PRE FRONT WHEEL BRAKE LANDAULETTE REAR SHOCK ABSORBERS 25 LBS. FRONT 25 LBS. Bar 3: 54 CC - 40/50 PHANTOM LIMOUSINE. STANDARD SPRINGS. REAR SHOCK ABSORBERS 25 LBS. FRONT SHOCK ABSORBERS HYDRAULIC 25 & 75 Bar 4: 102 CC - HISPANO NO SHOCK ABSORBERS | ||
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).