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).
Instruction sheet detailing the failure of a Watford sleeveless magneto during electrical tests.
| Identifier | ExFiles\Box 65\3\ scan0028 | |
| Date | 31th May 1927 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 451-8-12-24) MP 306975 X7791 ROLLS-ROYCE LTD. INSTRUCTIONS. To E.7.b. Order No. WC22 Customer's No. X7791 Date 31 - 5 - 1927 Watford sleeveless magneto No 98201. Electrical tests now carried out on this magneto show that it fails to pass our specification in the following items:- 3) The range is only 50° whereas 55° is the minimum on the engine and we specify 58°. 5) The utility performance is poor sparking only occurring on our leaky gap in the retarded position. The figure of merit is also very low. 6) The maximum advanced sparking Signed conta. This Sheet must be filed on completion of the work. | ||