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).
The preliminary testing and performance of two new magnetos compared to existing models.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan068 | |
| Date | 30th September 1929 guessed | |
| -2- The two good magnetos were preliminarily tested on the bench with very good results, the low speed sparking of these magnetos, as in the case of the New PhantomCodename for PHANTOM I type EW6A magneto, was very good, and a test of one magneto on a 20 HP. chassis had shown itself able to start the engine cold on magneto only by hand with the ignition lever fully retarded. This is not very easy with the present standard R.O.1. type. The leaky gap performance of this R.O.2. magneto is also very good. As to whether this new magneto will cause battery ignition distributor spark points to be unduly burnt away, we are preparing a combination of magneto and battery ignition distributor for bench test to observe this effect. One of the R.O.2. magnetos is being run on one of the new 20 HP. chassis (25 HP. ) which is run on magneto only for the purpose, further to test this point and also the general running over a long mileage. The weight of the R.O.2. magneto is 7¾ lbs. as compared with 7½ lbs of the R.O.1. type. The range of these magnetos is 60°, and the contact breaker timing is, as in the case of the Phantom magnetos, in accordance with our recommended timing for rotating armature type magnetos. The short circuit primary ampere speed characteristic shows a good shape, considerably better than the present standard Phantom Watford E.W.6. | ||