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).
Improved spring drive for the Goshawk 11 engine, referencing drawing No.Lec.1665.
| Identifier | ExFiles\Box 74\3\ scan0272 | |
| Date | 30th December 1922 | |
| To BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} c. to CJ. Wor.{Arthur Wormald - General Works Manager} c. to HS.{Lord Ernest Hives - Chair} EP.{G. Eric Platford - Chief Quality Engineer} X4221 E1/M30.12.22. GOSHAWK 11. IMPROVED SPRING DRIVE. X.4222 X.4221. In accordance with Mr. Royce's recent memo. we send you herewith drawing No.Lec.1665 shewing an improved spring drive for the Goshawk. This is intended to be used in conjunction with the existing crankshaft, existing crankcase, and existing wheelcase. It also uses the existing slipper flywheels and securing and withdrawing nuts on the crankend. In operation this spring drive should be an improvement over anything we have had before. It should be better than the 40/50 in-so-far that it has absolutely no slack in half the damping for the spring drive, and absolutely no endplay. As the speed of the engine increases the end thrust of the crankshaft pinion tends to decrease the damping effect on the spring drive which is rather what we want as it allows us to have a stiff damping effect at low speeds. We have cancelled the cast iron fan drive pulley and replaced it by a pulley made from 2 similar sheet metal stampings placed back to back. This should be a great improvement as regards reliability, cost, and weight. The spring driving jaws on the crankshaft pinion have been carried out in rather a new way which allows of easier manufacture and saving in cost. The pressure plate for the damping device is intended to be an aluminium die casting in piston alloy. The complete slipper flywheel spring drive and crankshaft pinion has to be placed on the crankshaft as a unit, but we think you will be able to see contd:- | ||