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).
Magneto drive for the Goshawk 11 engine, including fitting instructions and a proposal for the crankcase breather.
| Identifier | ExFiles\Box 76\2\ scan0165 | |
| Date | 5th November 1921 | |
| To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to BY.{R.W. Bailey - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} X4327 E1/G5.11.21. X.3550 - GOSHAWK 11. MAGNETO DRIVE. X.4238 We send you herewith drawing No.LeC.1479 shewing the magneto drive for Goshawk 11. Provision for adjusting the timing of the magneto is made in the 40/50 HP. manner on the dynamo drive gear wheel. The magneto has been mounted on a bracket bolted to the side of the crankcase. Normally, this face will be machined and drilled and provided with dummy bolts. If it be desired to fit a magneto to an engine already built up, it will be necessary to pull off the bottom half of the crankcase for the purpose of inserting the bracket bolts. This contingency, however, should be rare, as it will most likely be known before-hand when it is intended to fit a magneto to any particular chassis. It will be necessary to alter the exhaust system to enable the exhaust down-take pipe to clear the magneto drive tube. Also a new oil filler will be drawn. Mr. Royce proposes with regard to the breather, that the crankcase shall be connected to the carburetter silencer near to a free vent from the open air, so that the gases from the crankchamber will be drawn into the carburetter, but no air will be drawn through the crankchamber. E.{Mr Elliott - Chief Engineer} | ||