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).
Performance and proposed modifications for the lengthened Lucas dynamo.
| Identifier | ExFiles\Box 182\M16\ img040 | |
| Date | 1st August 1921 | |
| To [illegible] from R.{Sir Henry Royce} HS{Lord Ernest Hives - Chair}✓ (For the attention of CY.) [Handwritten pencil notes: pinion-rattling & crankshaft vibration, plunging high raging thrusts...] ORIGINAL X4352 RE LENGTHENED LUCAS DYNAMO. x295 x576 I am quite satisfied with the output and performance of the lengthened Lucas machine as given in your diagram. It will be remembered that we suggested this a very long time ago, when they failed to make anything of reasonable dimensions and weight. We have now two dynamos of reasonable speed, namely, the Smith 2D and this Lucas. The next point we must watch is that we are sure that these are driven satisfactorily with the belt. I should suggest using a slightly larger pulley on the dynamo because we are now gearing the cars lower, and therefore the engine will run faster. I think the ratio should be kept at, or less than the original amount, i.e. not more than 1 to 1. An attempt to drive the Lucas machine at an increased speed is one of the causes of our early failures. It originated at the Works or at Lucas' suggestion. Not at WW!!! X3735 X3772 We must see that the short-linked Whittle belt is used and the spring control of the position of the dynamo. Having X3749 X2575 seen to these modifications we must return to the switch box. It will be understood that we wish the fuse carriers to be of a more reliable pattern than the Lucas type, that the fuses should be of copper wire, and not tin or lead. They should be of ample dimensions, as fuses cannot be made delicate enough to melt at an overload current, and they can only act in case there is a short-circuit. (Contd.) | ||