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).
Weight analysis of Jackall components for the Phantom II and Rolls-Bentley models.
| Identifier | ExFiles\Box 139\2\ scan0088 | |
| Date | 26th May 1934 guessed | |
| PHANTOM II. ROLLS-ROYCE. JACKALLS Unsprung Weight lbs. oz. 4. Medium-size jacks @ 5lb.11oz. each.......... 22 12 2. Rear brackets @ 3lbs. each.................. 6 0 2. Pieces of copper tube & 2 flexes.......... 2 14 1. Complete set of front axle claw fittings... 10 13 Total unsprung weight.. 42 7 Sprung Weight Distributor box with handle as now fitted...... 10 0 As you are aware this is being modified, using a sheet-metal base, with a bracket integral with interior unit, and this should be reduced by (I should say) 2-3 lb. ------------------ ROLLS-BENTLEY Unsprung Weight. lbs. oz. 4. Medium-size jacks @ 5lb.11oz. each......... 22 12 2. Rear brackets @ 3¼lb. each.................. 6 8 2 Front brackets @ 2¼lb. each.................. 4 8 2. T pieces, copper tube & 2 flexes........... 2 14 Total unsprung weight.. 36 10 Sprung Weight Distributor box with handle as now fitted........ 10 0 The same remarks apply here as to the Phantom II. The system can if necessary be further lightened by introducing Duralumin or Rolls Royce metal for each Jack ram base. | ||