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 magneto performance, detailing short tests and utility tests to measure maximum spark gaps on various models.
| Identifier | WestWitteringFiles\I\July1922\ Scan125 | |
| Date | 31th July 1922 | |
| Contd. -7- EPCL/T31.7.22. place on the safety gap of the magneto, also went through successfully on the two Watford magnetos, and was not carried out on the Bosch. (12) A short test of 15 minutes at 1500 R.P.M. with timing lever central and discharges taking place on 5.5 mm gaps in air, with standard lengths (2 ft) of high tension cable as usual was now taken on each Watford machine to see that it was normally correct after open circuit test. On the EO6c some missing occurred. On the ELO.6 the test was O.K. (13) Utility Test. In the utility tests leakage paths as follows are connected across one of the six gaps with the magneto running at 1500 R.P.M. and the greatest length of regular spark obtainable in each case ascertained. (a) Nothing connected across. (b) The secondaries of two Remy coils in series connected across, one Remy primary being short circuited. (c) Ditto, but with both Remy primaries short-circuited. (d) The secondary of one Remy coil only connected across with its primary short circuited. The maximum gaps (mm) obtained on the three magnetos were as follows :- (a) (b) (c) (d) Safety gap. ZR.6. 8.5 8.0 6.7 5.3 8.6 EO6.c 6.5 5.3 3.5 2.4 7.6 ELO.6 6.75 6.75 6.5 4.0 10.0 It will be noticed from the above that the larger Watford machine is an improvement on the EO6c. | ||