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).
New sleeveless Watford magneto machines, detailing weight reductions and design differences compared to previous models.
| Identifier | WestWitteringFiles\Q\2-July1927-September1927\ 91 | |
| Date | 7th September 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} EY. Mx.{John H Maddocks - Chief Proving Officer} ORIGINAL EFCL/T7.9.27. x7791 NEW SLEEVELESS WATFORD MAGNETO. (2nd.& 3rd. Machines Nos.99171 & 99802) Further to EFCL/T13.6.27 and EFCS/T23.8.27, we received a third and further machine to No.99171, viz. No.99802. The first one, No.98201, which was stated by Messrs. Norths to have been sent us for its electrical performance and not for silence, is being returned, but the later two above mentioned purport to be representative of what we should receive on production. The weight of each of these two machines is 12.9 lbs, this being a reduction on that of No.98201, which was 13.625 lbs.wt. The present standard E06 is 13.500 lbs.wt. Machines Nos.99171 and 99802 have the following differences as compared with the original No.98201, design details of which we gave in our EFCL/T13.6.27. (1) Contact breaker cover now moves with cam ring, having only the one securing spring. As there is now no sleeve, the friction damping of the sleeve provided by the kuzak double spring contact breaker cover arrangement is not now required. (2) Plain distributor bearing. (3) Magnets are only secured by screws through end plates. Safety gaps 8.5 mm., and primary point gaps, as received, each .010". Contact breaker timing. This is still more normal than in the case of No.98201 and in fact agrees entirely with our recommended timing. Make advanced 5º before position of maximum flux. | ||