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).
With sketches detailing Mr. Royce's design approval for a 40/50 HP magneto strap.
| Identifier | ExFiles\Box 40\5\ Scan003 | |
| Date | 8th October 1919 | |
| H & H 500 T (S.U.) 575. 16-4-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2354 To da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " BN.{W.O. Bentley / Mr Barrington} " " EH. " " EFC. RE 40/50 H.P. MAGNETO STRAP. X.3630. With reference to you scheme N.123, would you kindly note that Mr. Royce approves of the magneto being canted to an angle of 20°, and does not think we should make it less. To avoid having weak aluminium lugs, however, for securing the clamping bolt, he wishes the 20 H.P. strap to be used, in which the metal of the strap is carried right round a suitably shaped waist in the bracket. The sketches below shew how this should be applied to the 40/50 H.P. If the magneto strap shewn on LeC.1131 be scaled up in proportion to the magnetos, ti should be suitable. It is desirable, Mr. Royce points out, in making the design, to place the two cross pin members of the strap as far apart as possible, so that when the magneto is detached, the strap will not have to open very far. E.{Mr Elliott - Chief Engineer} PIN TO POSITION STRAP NEARLY TOUCHING CRANKCASE TO PREVENT STRAP CLIPPING OFF. | ||