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).
Comparison table of spring rate and buffer clearance data for Phantom III, 30 HP, and Bentley models.
| Identifier | ExFiles\Box 106\1\ scan0409 | |
| Date | 30th December 1936 guessed | |
| 546 | | SPRING RATE | BUFFER CLEARANCE. | CHANGE IN BUFFER CLNC. DUE TO 50LBS | REDUCTION IN BUFFER CLNC. FOR 50 LBS. | POUNDAGE NECESSARY TO MAKE 7% CHANGE IN BUFFER CLNC. | |---|---|---|---|---|---| | PH. III. REAR. | 207 LBS/" | 3.550" | .242" | 6.85 % | 51.3 LBS. | | 30 H.P. | | | | | | | FRONT | 200 | 2.250 | .250 | 11.1 % | 31.4 LBS. | | REAR. | 177 | 4.000 | .283 | 7.1 % | 49.5 LBS. | | BENTLEY | | | | | | | FRONT | 333 | 1.600 | .150 | 9.4 % | 37.3 LBS. | | REAR. | 238 | 2.600 | .210 | 8.1 % | 43.3 LBS. | | ||