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).
Report comparing observed and calculated current consumption curves and sparking for Remy ignition systems.
| Identifier | ExFiles\Box 52\3\ Scan306 | |
| Date | 12th December 1917 | |
| R.R. 235 a 100 T (R.F. 846, 6-8-19. G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2460). Contd -17- EFC {E. Fowler Clarke - Electrical Engineer} 2/Tbl.12.17. hence the observed and calculated curves are not directly comparable although they show in a general way the effect of the ballast resistance keeping the currents down for large values of the ratio. By producing curves E and F it is seen that the current consumptions corresponding to a make ratio of unity are 2.25 and 2.75 amps. for Remy 6 and 12 respectively. This of course impliesthat the energy of magnetic field is dissipated instantaneously and the current starts to rise again from zero immediately. Actually the observed short circuit currents for the two cases at 6 volts are 3.3 and 3.5 amps, but then in this case there is so dissipation of magnetic field energy in producing sparks. Similarly the calculated current for Remy 13 for unity ratio is 3.38 amps. whereas the short circuit current is 6.49 amps. In all the calculated curves the ballast resistance has been taken at constant at its normal working value. Experimental for Remy 12 at 900 R.P.M. In addition to plotted curve of current consumption against gap the following points were noted. On primary gaps of .005" and .010" there was a little more sparking than for normal gaps. For all larger gaps this was normal. Missing on 8 mm. secondary gaps did not occur until primary gap had been increased to .035" and at .040" there were only occasional sparks. | ||