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).
Cracked cam wheel on a Goshawk 11 engine due to vibration during high-speed running.
| Identifier | ExFiles\Box 74\3\ scan0255 | |
| Date | 14th February 1922 | |
| To E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Wor.{Arthur Wormald - General Works Manager} X4221 Hs{Lord Ernest Hives - Chair}8/LG14.2.22. GOSHAWK 11. ENGINE VIBRATION. X4221 We have cracked a cam wheel similar to the others on the Goshawk engine which was fitted with slipper wheel which has been carefully balanced and with the springs adjusted tightly. The damage was done by running the engine as fast as possible on second speed - the engine revs. went up to 3300 to 3400. Several of the Goshawk engines which we are running have loose extension pieces fitted to the front end of the Crankshaft to carry the spring drive and slipper wheel. This was done in order to use up existing Crankshafts which have been made for the original type spring drive and slipper wheel. The extension is fixed in exactly the same manner as the extension on the front end of the "Condor" engine Crankshaft. So far they have given no trouble. The engine which has given the most trouble as regards breaking of cam wheels is one in which the extension in the slipper wheel and spring drive is solid with the shaft. Hs.{Lord Ernest Hives - Chair} | ||