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).
Ignition coil analysis sheet.
| Identifier | ExFiles\Box 164\5\ img114 | |
| Date | 16th December 1931 guessed | |
| Test Ref. No. IGNITION COIL ANALYSIS SHEET D72503 Type: Rolls Royce. Serial No: SR95K. Voltage: 12. Cyl No: 6. Windings: Primary: S.W.G. ____ Turns ____ Insulation ____ Secondary: S.W.G. " Turns " Res: ____ ohms Secondary Insulation-Material: ____ Thickness ____ Test Results: Performance Test (Columns: Baseline, With .56 mfd. condenser, LUCAS OO 12.) - Connected load on Sy: 0, 10, 0 - First Voltage Peak V1: 10, 10, 10 - Second " V2: 6.4, 7.4, 7.9 - V2/V1: .64, .74, .79 - Primary current: 1.48, 2.05, 1.28 - Energy Joules per spark: .0104, .0194, .0094 - 2E/V1²: 208, 388, 188 - Equiv. Secondary capacity: - Primary Inductance: 9.2, 9.2, 11.5 Heating Test - in air: Cold Primary Res: .89 ohms. Hot res: 1.0 ohms Temp Res: 28.2 °C Volts: 2.1 Watts: 4.41 Overall thermal Res: 6.4 °/Watt Hot starting factor: ____ per cent Heating Test - in water: Hot resistance: ____ ohms. Temp Rise: ____ °C Thermal Resistance to case: ____ ° per Watt General Notes: | ||