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).
Wheel types and specifications for shock dampers for the 40/50 HP chassis.
| Identifier | ExFiles\Box 181\M11\ img108 | |
| Date | 31th August 1918 | |
| To BY.DA.{Bernard Day - Chassis Design}& EH.from R.{Sir Henry Royce} -9- R7/3181218 Contd. (14) WHEELS. Rudge-Whitworth and Michelin wheels Mr. Royce thinks will supply all customers wants. It is not desired to use Dunlop wheels, which are thought to be too complicated. Enquiries should be made as to how the Rudge-Whitworth hubs have behaved in practice under war conditions, and provided their reputation has been good, they should be adopted because of their simplicity. We should obtain and test Michelin disc wheels at the earliest moment for the 40/50 H.P. chassis. The Michelin is to be preferred to the Rudge-Whitworth for the advantages it offers in respect to easy climbing, cool tyres, simplicity, etc. (15) SHOCK DAMPERS. Shock absorbers of the progressive type have at high speeds been found in practice to add to the steady running of the car when applied to the rear axle, which on the present standard chassis, is not fitted with shock absorbers. The Truffault shock absorber of this type, however, is much too large and heavy to be adopted. Mr. Hives specifies that the axle should have 1" free movement, then a force of 30 lbs. on the shock absorber rod within an amplitude of 3" and finally, a force of 100 lbs. should be exerted on the shock absorber rod for the remainder of the travel. These figures, however, he wishes to confirm by further observations. A design for a suitable shock damper is to be made at West WitteringHenry Royce's home town. (Contd.) | ||