Calculation of the unsprung weight for a Phantom II rear axle.
| Identifier | ExFiles\Box 18\1\ Scan040 | |
| Date | 4th June 1930 guessed | |
| Run from Dy. {F R Danby} PHANTOM 11 REAR AXLE UNSPRUNG WEIGHT. Axle as weighed with old wheels (no oil).......... 579 lbs. Less old wheels................................... 155 lbs. Weight of axle without oil......................... 424 lbs. 1/4 gallon of 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. V [Handwritten annotations] 136lbs MX {John H Maddocks - Chief Proving Officer} / | ||
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).