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).
Magneto and Remy coil tests, detailing spark gap and performance measurements.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan270 | |
| Date | 18th December 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. -5- EXPERIMENTAL REPORT. Contd. Expl. No. REF FPM/18.12.25. (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. These tests are taken with the timing lever central and the length of H.T. lead 2 ft. The maximum gaps (mm.) obtained on the three magnetos were as follows :- Magneto. A.{Mr Adams} B. C. D.{John DeLooze - Company Secretary} Safety gap. Standard Watford. 8.2 7.8 7.4 5.4 8.5 B.T.H. No.356071. 7.2 7.0 6.8 5.6 7.8 B.T.H. No.356147. 7.3 6.9 6.5 5.7 7.8 (11a) Alternative utility tests utilising standard-ised annular spark gap of 3.0 mm. with shunted leak of 1 micromho. our standard In this case the leaky spark gap is arranged to replace one of the six 3-point test gaps sparked by the magneto in (6) above, the remaining gaps being set as before to 5.5 mm. The ranges of speed over which the three magnetos were capable of regularly firing this leaky annular gap, for any position of the advance lever, was :- Watford. 500 to 3000 r.p.m. B.T.H. (No.356071) 320 to 3300 r.p.m. B.T.H. (No.356147) 350 to 3700 r.p.m. Contd. | ||