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).
Required modifications for a B.60 unit crankshaft damper following endurance testing.
| Identifier | ExFiles\Box 123\5\ scan0259 | |
| Date | 20th January 1939 | |
| 1044 also 1116 To By/Ald.{F. Allwood - Experimental Design} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} c. Da{Bernard Day - Chassis Design}/McS. Following the endurance on the B.60 unit, the condition of the crankshaft damper shows that various modifications are required. (1) The leaf springs are biting into the soft hub base. Hardened steel washers recessed into the hub face should effect an improvement. The washers should only stand proud by say .010-.020 in order that the existing springs in regard to their width can be used. (2) The springs are getting rusty. Cadmium plating of the springs to be tried to overcome this trouble. (3) The brass thrust washer which keeps the damper flywheel clear of the hub which, before its introduction the two parts almost welded together has been effective. Examination, however, shows the face of the brass washer to be plucking and wearing. In respect of this, Vandervells have supplied us with steel thrust washers with a "Clevite 10" face, which material is said to be much more suitable on a dry thrust face than brass. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} has a supply of these which should be shown on the drawing and pegged to prevent rotation. (4) Some of the springs have taken a permanent set and others have broken. The stressing of them during the damping of crankshaft oscillations apparently is too high. As a trial to overcome this we should try are shaped wedges of rubber, between the outer leaves and the recesses in the damper flywheel. When the above has been schemed out and detailed, HPS.{Horace Percy Smith - Experimental Factory Mgr} should be instructed to try out the above on the damper removed from B.60 No.1 unit after six hours' endurance and upon which we base the above comments. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||