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).
Calculation of the unsprung weight for a Phantom II rear axle.
| Identifier | ExFiles\Box 16\7\ Scan275 | |
| Date | 11th June 1930 guessed | |
| wrong PHANTOM II REAR AXLE UNSPRUNG WEIGHT Axle as weighed with old wheels (no oil).............579 lbs. Less old wheels......................................155 " Weight of axle without oil...........................424 1/2 gallon oil.........................................5 Two 20" wheels and tyres.............................172 Half weight of prop. shaft...........................24 Half weight of brake ropes...........................2 Two thirds weight of two 1200 lbs springs............108 Two thirds weight of spring gaiters..................3 Total 738 lbs. [Handwritten note next to the 'wheels and tyres' line]: 136 Lbs ? [Handwritten initials bottom right]: hx | WNy | ||