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).
Test results for magneto low speed performance, concluding it has insufficient energy to satisfy production specifications.
| Identifier | ExFiles\Box 65\3\ scan0231 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. 19 To Order No. (3) Customer's No. The low speed figures with and without the leak were as follows:- Minimum speed for regular sparking on 5.5 m/m gaps in air:- Advance 135 rpm Retard 120 rpm with the std leak and annular test gap the minimum retarded figure was 250 rpm. The E06 production specification limits of low speed performance are:- Advance 280 rpm Retard 190 rpm. It appears therefore that the EW6 type magneto has insufficient energy at low speeds to satisfy Signed contd. This Sheet must be filed on completion of the work. | ||