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 performance and endurance testing of magnetos, comparing EW6A, standard EW6, and R.Bosch models.
| Identifier | ExFiles\Box 65\3\ scan0387 | |
| Date | 20th July 1929 guessed | |
| -4- contd. "The high speed fully advanced performance was also tried on this chassis, with the magneto hot, with equally satisfactory results, no misfiring being recorded. "Of the two magnetos tested on the bench No.118717 was undoubtedly the best, and if all EW6A magnetos could be made similar we suggest that they would be an excellent proposition. In addition to all the above tests we have placed magneto No.118718 on the 3-phase continuous running rig for a 500 hours endurance test under normal conditions at 2950 r.p.m." Observation of the short circuit primary winding ampere-speed curve is one of the tests made during bench tests of experimental magnetos. The curves for the two EW6A machines actually bench tested are practically identical and are therefore exhibited as one curve on the photostat attached, but it is exhibited in comparison with a similar curve for the present standard EW6 magneto and also with the similar curve taken on an R.Bosch machine, the short circuit current in each case being exhibited not at its observed amount but as a percentage of its maximum at the high speeds at which it is practically constant. It will be noted how much more nearly the new curve coincides with the R.Bosch curve than the curve for the present standard EW6, indicating the importance of the total cross sectional conductence of the primary winding at low speeds, a feature which | ||