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).
Typed memorandum detailing issues and proposed changes for an air pump, coil, battery, and pistons.
| Identifier | ExFiles\Box 181\M7\ img030 | |
| Date | 9th April 1920 | |
| R.R. 735 A Contd. (IC 1819) C. 2160. -2- Hsl/LC9.4.201 [Handwritten note on right margin: Reply at once] serrated one the internal and external serrations shall be cut on the Fellows Gear Cutter. The trouble we have found with the fabric couplings is that it is very difficult to get them to run absolutely true and it looks very bad to lift the bonnet and see the magneto drive wobbling out of truth. X.3538 3. New Air Pump. We think it is doubtful whether there are sufficient advantages in the new air pump to warrant the change over in design with the necessary expense of tools and upsetting interchangeability of parts. X The pump is very similar to the one we are using although all the parts are altered.X Our impression is that the troubles we have found with the preset pump can all be attributed to the fit of the piston in the cylinder. In the new pump the same conditions will occur. X.3778. 4. Coil. The coil on this car has had less high tension turns. The coil has given no truble but we think it would be unwise to depart from the present standard coil. We have now had the experience of hundreds of these coils, whereas, we have only had one of the coils with the less turns running on a car. X.607. 5. Smaller size Battery. The standard battery we are now using is 55 ampere hour - the one which has been running on 2.EX car is 45 ampere hour. They had trouble with the battery owing to the internal connection on one cell going wrong. We are not prepared to recommend this smaller battery as standard. The following is a list of parts which we intend to issue standardisation sheets for:- X.3757 1. Improved type split aluminium pistons (standardisation sheet for this has been signed). [Stamp: ConRECEIVED,] [Stamp: APR 9 1920] | ||