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).
Instruction sheet detailing test results and analysis of various ignition coils, comparing SG and Goshawk types.
| Identifier | ExFiles\Box 45\4\ Scan038 | |
| Date | 12th October 1922 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: E.F.C. Order No: PB58 2. Customer's No. X 4079 Oct. 12th 1922 [Table of Test Results] Tests. Coil | 1. | 2. | 3. | 4. | 5. | - | 6. | Remarks Units: | | m.a. | m.m. | amps. | amps. | volts | amps | ohms | Amer. Prod. | O.K. | 11.3 | 5.2 | 1.37 | 1.05 | 1.07 | 1.63 | .657 | S.G.1 | O.K. | 10.5 | 6.3 | 1.31 | .94 | 1.15 | 1.65 | .697 | 25" Ballast S.G.2 | O.K. | 10.3 | 6.3 | 1.36 | 1.02 | 1.21 | 1.83 | .661 | 25" Ballast It will be seen, first, that there is practically no difference between the sparking performances of the two S G coils. Secondly, that the sparking is an improvement on that obtained from the average Goshawk coil hitherto made; partly due to the lower resistance ballast and partly to the increased insulation. From these results, and the general behaviour of the coils, it is thought that the extra insulation (paper and wax) will improve the Goshawk production coil in two ways. It will improve the Cont'd.{John DeLooze - Company Secretary} Signed This Sheet must be filed on completion of the work. | ||