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).
Table detailing the resistances and inductances of Goshawk ignition coils.
| Identifier | ExFiles\Box 45\4\ Scan163 | |
| Date | 22th November 1922 | |
| X 4079. 22.11.22. 24.5.23. X.4079 - PARTICULARS OF RESISTANCES AND INDUCTANCES OF PRIMARIES AND SECONDARIES OF GOSHAWK IGNITION COILS. PRIMARY SECONDARY Coil. | Resis. (W) | Imped. at 50~ (W) | Reac. at 50~ (W) | Induc. (hys) | Resis. (W) | Imped. at 50~ (W) | Reac. at 50~ (W) | Induc. (hys) | Remarks. TG.1 | .698 | 3.30 | 3.22 | .01026 | 6750 | 15,030 | 13,430 | 42.8 | In Lab. TG.2 | .678 | 3.40 | 3.33 | .01060 | 6280 | 14,800 | 13,410 | 42.7 | In lab. Dismantled 1.TG.3 | .693 | 3.53 | 3.46 | .0110 | 6880 | 17,600 | 16,200 | 51.6 | 5-GII. Lab. 2.TG3 | .659 | 3.12 | 3.05 | .00972 | 7280 | 18,500 | 17,010 | 54.2 | 2-GII. Lab 3.TG.3. | .673 | 3.06 | 2.98 | .0095 | 6970 | 17,170 | 15,690 | 50.0 | G.I. 5GII 4.TG.3. | .701 | 3.16 | 3.08 | .00981 | 6500 | 16,000 | 14,620 | 46.6. | In Lab. 5.TG.3. | .675 | 3.18 | 3.11 | .00989 | 5,500 | 18,440 | 17,600 | 56.1 | On 7 G.II. Lab. 22.11.22. R.R. 199 (2/27) (SDG9) (9-17) M1/18/66 | ||