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).
Experimental crankshaft damper with a solid drive for the fan pulley for the Wraith III.
| Identifier | ExFiles\Box 8\5\ 05-page18 | |
| Date | 5th January 1938 | |
| BY/RS.{Sir Henry Royce's Secretary} c. Rm.{William Robotham - Chief Engineer} 614 Files DA.{Bernard Day - Chassis Design}12/G.5.1.38. WRAITH 111. CRANKSHAFT DAMPER WITH SOLID DRIVE FOR FAN PULLEY. (EXPERIMENTAL ONLY). Please receive herewith E.CD.326 - Crankshaft damper with solid drive for Fan Pulley. Wraith 111. This design has been made for the purpose of trying out the value of the fan for crankshaft damping, with as little alteration as possible to existing parts, the fan now being driven through four studs in the driving member of the spring drive centre plate. The crankshaft and wheelcase are unaltered, as also are a number of the other pieces used, also, most of the altered parts can be made from existing pieces. Will you please detail and instruct for this experiment as soon as possible, as the resultant information is required for the B.50 engine. We should like to point out that while not doubting the value of this experiment the damping obtained from the belt is likely to be very different from that from the damper flywheels, the belt being tensioned on one side and slack on the other, unless the belt is very tight, in which case it probably would not last. The reduction of the inertia of the fixed masses at the front end of the crankshaft seems important. DA.{Bernard Day - Chassis Design} WYMAN | ||