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).
The mileage testing of various coils on Goshawk engines, concluding with the benefits of an improved design.
| Identifier | ExFiles\Box 172\3\ img068 | |
| Date | 24th July 1923 | |
| contd:- -2- EFC1/T24.7.23. Coil. TG1. 3714 miles on 7-Goshawk-11. TG2. 1618 miles on 3-Goshawk-11. 1TG3 466 miles on 4-Goshawk-11 and several hundred miles on 5-Goshawk-11 at W.W. 2TG3. Several thousand miles on 2-Goshawk-11. 3TG3. 683 miles on Goshawk 1. 5TG3. 5875 miles on 7-Goshawk-11. It is therefore considered that we have had sufficient running on the improved coil, considered apart from the material of the case, to be able to say that the improved insulation of the primary and the modified dimensions of the case, represent a distinct improvement when combined with the use of a case made in Stabalite. EFC. | ||