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).
Investigation into Goshawk 11 engine vibrations by analyzing a camshaft slipper wheel.
| Identifier | ExFiles\Box 74\3\ scan0256 | |
| Date | 16th February 1922 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c.c. to CJ. c.c. to E.{Mr Elliott - Chief Engineer} c.c. to Da.{Bernard Day - Chassis Design} c.c. to EY. c.c. to EP.{G. Eric Platford - Chief Quality Engineer} c.c. to Wor.{Arthur Wormald - General Works Manager} Handwritten: X42-21 Hs{Lord Ernest Hives - Chair}1/LG16.2.22. GOSHAWK 11. ENGINE VIBRATIONS. X.4221. We are sending to you the Camshaft wheel which has been run on a Goshawk engine fitted with a carefully balanced slipper wheel and springs adjusted tightly. This wheel is very interesting because it shows 6 distinct marks on the outside diameter where the bolt heads in the slipper wheel have been catching. With the engine at rest, there was from .1 to .125" clearance between these bolt heads and the Camshaft wheel. The fact of the 6 distinct marks on the cam wheel point to the slipper wheel deflecting at every explosion. We are, however, now running the Goshawk engine by means of a belt and we find that if we revolve the crankshaft only without any rods or pistons at high speeds, the slipper wheel deflects .025". We have also driven it with a belt with the rods and pistons fitted. Under this condition we can get bad vibrations and the slipper wheel deflects .060" to .075". Hs.{Lord Ernest Hives - Chair} | ||