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).
Page of calculations for wire coil specifications including resistance, amperage, and voltage loss.
| Identifier | ExFiles\Box 51\1\ Scan021 | |
| Date | 6th July 1921 guessed | |
| Contd. -6- Length of wire in coil = 120 x 9.6 ÷ 12 = 96 feet Resistance at 0°C = 96/1000 x 5.97 = .573 w Resistance at 100°C of whole field = .573 x 1.42 x 4 = 3.26 w Field amperes at hot cutting in point as shunt machine = 13.6/3.26 = 4.17 Ampere-turns =4.17 x 120 = 501 Volts lost in armature due to field current = 4.17 x .482 = 2.01 this agreeing with assumed value. Contd. | ||