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).
Spring drive tests for the Goshawk engine, recommending a separate friction flywheel to overcome crankshaft periods.
| Identifier | ExFiles\Box 79\3\ scan0131 | |
| Date | 23th September 1921 | |
| Extract from Hs{Lord Ernest Hives - Chair}5/LG23.9.21. X.4222. SPRING DRIVE. X.4222. We have carried out a number of further tests with the spring drive on the Goshawk but we have not been successful in being able to overcome the crankshaft periods at all speeds with the present type of friction flywheel. From the results of our further tests we believe that when we have overcome the period at 50 m.p.h., it has been due to the flywheel being locked solid to the crankshaft and therefore considerably reducing the speed at which the period occurred. We have fitted to the Goshawk car a temporary friction flywheel which operates in the same way as that on the 40/50 H.P. that is, the friction flywheel is a separate unit from the spring drive. We have proved that we can with this, overcome crankshaft periods effectively without introducing other faults. We recommend that a scheme like this should be got out for the engine. Hs.{Lord Ernest Hives - Chair} | ||