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).
Routine test results for two Watford R.O.1 magnetos which passed production testing.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan70 | |
| Date | 15th May 1924 | |
| To R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} from EFC. C. CJ. & FN. By ~~RM{William Robotham - Chief Engineer}~~. ~~HR~~. DA.{Bernard Day - Chassis Design} ORIGINAL X.3551- R.O.1. WATFORD MAGNETOS. _________________________________ It is thought desirable to state for purposes of record some general magneto routine test results which have been obtained on two magnetos of the Watford R.O.1 type which havesatisfactorily passed our production test. Amongst other things, the production test calls for:- (1) A range (on magneto) exceeding 58°. (2) Slow speed sparking characteristics as follows :- Regular sparking on 4.5 mm. gaps in air at speeds not exceeding for:- (a) Fully advanced position 450 r.p.m. (b) Central position 300 r.p.m. (c) Fully retarded position 275 r.p.m. (3) Occasional sparking in the fully retarded position on 4.5 mm. gaps in air, at 100 r.p.m. On an endurance test on the bench of 12 hours duration with high tension spark gap set to 4.5 mm. the sparking was O.K. Slight carbon deposit on the H.T. collector and also on the insulating flanges of the slip ring was observed. Lubrication of the rubbing block was O.K. This applies to both machines. Short circuit and open circuit routine tests - satisfactory on both machines. WHS A utility test was carried out as described in other magneto reports - regular sparking gaps observed under various conditions :- Contd. | ||