Noise test for a ventilated dynamo, identifying an electrical noise during charging while the fan remains quiet.
| Identifier | ExFiles\Box 101\4\ scan0003 | |
| Date | 15th March 1935 | |
| To Ha/Wst. c. to E. {Mr Elliott - Chief Engineer} c. to By. {R.W. Bailey - Chief Engineer} c. to Ha/Rm. {William Robotham - Chief Engineer} + 5840 Hs {Lord Ernest Hives - Chair} /CEH.3/KW.15.3.35. 21-G-IV. We have fitted the ventilated dynamo to 21-G-IV and tried it for noise. There is a heavy note when the dynamo is charging which is electrical as demonstrated to you. The ventilating fan appears to be quiet as was demonstrated by cutting out the excitation of the machine. Ha/G.W.Hancock. | ||
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).