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).
Test report on a new arrangement comprising a lengthened motor, modified pinion teeth, and an interlocked switch.
| Identifier | WestWitteringFiles\T\November1928\ Scan080 | |
| Date | 12th December 1928 guessed | |
| To R.{Sir Henry Royce} -2- Contd. carried Report on test of new arrangement made out yesterday afternoon. The apparatus on test comprises the following:- (1) Motor - 1st. new lengthened armature motor (3.500") with 37 slots and 4 1/2 turns per field coil. (2) Straight pinion and wheel teeth as sharp as possible on engaging side and very well rounded off on disengaging side. Note. A good rounding off on the disengaging side appears to be a definite advantage in permitting an easier engagement, i.e. it appears to be the way of eliminating the possibility of the motor continuing to rotate rapidly past successive engaging positions without catching on the engaging teeth when and duly engaging. This has sometimes occurred in the course of our tests. (3) Second made mechanical interlocked switch with gaps carefully arranged to give suitable sequence and eliminate the possibility of the local current such as was at first experienced on the first switch. (4) Single push button switch. Throughout the test the mechanical interlocked switch worked without a fault. One noticed a slight flash at the carbon break of the teazer circuit as would be expected. In regard to the motor functioning, the functioning itself, apart from noise, was considerably better than we have ever had before. It should be said that the engine was slightly warm at the time of the tests and that stone cold tests have not been made. Engagement took place on the first operation of the push button in by far the majority of cases. Occasionaily the teeth met corner to corner and would not engage. In practically all cases of such failure, the release of the push button and re-application would result in engagement. ^more Occasionally the motor armature | ||