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).
Technical memorandum regarding proposed modifications and improvements to a sequence starter mechanism.
| Identifier | WestWitteringFiles\N\October1925-December1925\ Scan109 | |
| Date | 24th November 1925 | |
| R.R. 235A (100 T) (S.H. 159. 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 ORIGINAL TO EFC. } FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} (crossed out) Copy to - CJ. " - BJ. " - BY.{R.W. Bailey - Chief Engineer} re. SEQUENCE STARTER. X8650 ---- The spring drive on this (as EFC. points out) is not sufficient to damp out the thump on engagement. We have however seen a very satisfactory way in which we can delay the main switch cutting in, until the pinion is nearly home (in gear.) The scheme we have found also has the advantage that the circuit will not be broken until the pinion is nearly out of gear. This new contact maker will replace the one on the actuating box, and will be more of the nature of a switch than the spring contact maker. It will have sufficient friction to stay where put, and will be operated by 2 flanges on the pinion. The exact design we hope will be ready some time tomorrow. I do not think at present it will be wise to alter the winding on the motor because if we make it of fewer turns it will require more teazer current, which may make the contacts less reliable. We believe that it will be necessary to have a certain amount of elasticity in the drive even at an increased speed, as this is an excellent way of keeping the gears in mesh, permitting the engine to vary in speed without requiring the starting motor to vary also in speed at the same rate. At present we intend to keep the design of spring drive already sent, with a new ratio in the epicyclic reduction. This will be found to be 22 to 1., instead of 29 to 1. Regarding the occasional undesirable running in of the motor, we are leaving EFC. to try out more series turns on the magnet of the relay, and we suggest that we may also be able to reduce the air gap of the relay magnet and armature. I have every confidence that we shall soon get the starter satisfactory. (Stamp: RECEIVED 25 NOV 1925 HS{Lord Ernest Hives - Chair}) R.{Sir Henry Royce} | ||