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).
Proposal to alter the starter gear ratio on the Large Bore 20/25 and Bentley engines to address a whistling noise.
| Identifier | ExFiles\Box 82\4\ scan0147 | |
| Date | 9th September 1935 | |
| To <s>BY.{R.W. Bailey - Chief Engineer}</s> from E/JNR.{Charles L. Jenner} c. <s>Hs.{Lord Ernest Hives - Chair} RHC.{R. H. Coverley - Production Engineer} E/Lid.{A. J. Lidsey}</s> Handwritten: Rua x200 E/JNR.{Charles L. Jenner}1/HP9.9.35. re Large Bore 20/25. re Large Bore Bentley. There is one item on the specification of the above we should like to alter, namely the starter gear ratio. We do not wish to perpetuate thw Bentley ratio on the 25 HP. owing to the constant source of complaints about the whistling noise. Therefore, we suggest that on both these engines we shall have 14 teeth on the starter pinion, and 118 teeth on the flywheel in addition to the reduction gear in the starter motor. This will give us an overall ratio of 16 to 1. This is not a new proposal. Will you kindly refer to E/Lid.{A. J. Lidsey}1/HP.29.4.35. E/JNR.{Charles L. Jenner} | ||