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).
Comparative table of vehicle suspension tests detailing setups, clearances, and ride quality observations.
| Identifier | ExFiles\Box 95\3\ scan0062 | |
| Date | 13th February 1935 | |
| TEST N° CAR SPRING INITIAL DEFLECTION FRONT REAR BUFFER CLEARANCES FRONT BUMP REBOUND REAR BUMP REBOUND WHEEL-BASE ALTERATIONS FROM STANDARD. DEGREE OF DISCOMFORT COMPARED TO SPECTRECodename for Phantom III WHETHER FRONT WHEELS LEAVE THE GROUND OTHER NOTICEABLE FEATURES UNDER NORMAL ROAD CONDITIONS 1 28 Ex 4·5" 10·2" 1·875 4·000" 4·625" 150 K² / AB = 1 70% No RIDING GREATLY IMPROVED. CONTROL OF STEERING VERY BAD. 2 " " " " " " " WEIGHTS FITTED TO THE FRONT ONLY. 75% No RIDING BETTER THAN STANDARD. STEERING SELECTIVITY BAD. 3 " " " " " " " WEIGHTS REMOVED. 70% No REAR SEAT RIDE FAR INFERIOR COMPARED WITH SPECTRECodename for Phantom III. 4 " " " " 1" " " 75% Yes INCREASED TENDENCY TO PITCH. 5 27 Ex 8" 7" 2·625 3·125 4·000 150 45% Yes RIDING HARSH. 6 " " " " " " " K² / AB = 1 45% Yes RIDING STILL HARSH - GOOD RIDING OVER THE BUMP IS ACCOUNTED FOR BY EXCESSIVE FRICTION IN THE SUSPENSION SYSTEM AND THE FORWARD POSITION OF THE REAR SEATS. 7 19 G IV 7·2" 6·4" 3·8" 3·3" 4·2 132 DUBONNET INDEPENDENT SUSPENSION. 105% Yes NO FRONT SHOCK DAMPERS FITTED. 8 " " " " " " " DELCO INERTIA CONTROL SHOCK DAMPERS RAISING THE REBOUND LOAD FROM 70 LBS TO 350 LBS 80% Yes RIDING BAD - OWING TO INERTIA. CONTROL COMING INTO OPERATION ON WAVY ROADS. 9 BUICK 1·375 1·500 5·500 4·500 117 105% Yes RIDING POOR ON WAVY ROADS - POSSIBLY DUE TO THE SMALL REBOUND MOVEMENT. 10 20 G IV 4" 6·4 1·625 3·375 132" 35% No RIDING HARSH. GOOD ON BUMP OWING TO - STIFFER SPRINGS - WHEELBASE UNLIMITED REBOUND - CLOSE COUPLED SEATS. 11 CADILLAC 7" 7" 1·500" 1·250" 3·250" 156" REAR SEAT IS 8" FURTHER FORWARD FROM REAR AXLE THAN SPECTRECodename for Phantom III. 80% Yes 12 19 G IV 7·2 6·4" 3·800" 4·625" 4·200" 132" DAMPERS ON THE FRONT 40 LBS. DAMPERS ON THE REAR 60 LBS. REBOUND MOVEMENT INCREASED ·1325" 60% No RIDING MORE HARSH. FREEDOM FROM PITCHING GOOD. 13 18 G IV 4" 6·4" 2·000" 3·500" 132" 50% No Stamp Text: ROLLS-ROYCE, LTD. PRINT ROOM 13 FEB 1935 DERBY. | ||