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).
Engine slow running performance ('tick over') and proposed modifications for Air Ministry approval.
| Identifier | ExFiles\Box 179b\2\ img031 | |
| Date | 19th October 1932 | |
| -3- Ha/Lov.{Mr Lovesey}1/MJ.19.10.32. Cont'd.{John DeLooze - Company Secretary} We have obtained a 'tick over' as low as 200 R.P.M. but think this is lower than necessary as the ignition does not seem to be too regular at this speed. We consider 300 RPM. is the best all round speed. The slow running question is so important - particularly in the Fleet Air Arm where there is some prejudice generally against the water cooled engine - that we should take steps where possible to fit these modified parts to the machines engaged in this work. We therefore suggest that drawings of the necessary modifications are prepared from our Expl. working sketches and submitted for Air Ministry approval. In the meantime where it is thought necessary to correct some troublesome cases the parts could be prepared from our existing drawings. We should like to take the opportunity of demonstrating the slow running of the Fairey lll F.{Mr Friese} to anyone interested. We are strongly of the opinion that all slow running adjustments should be made before the engine leaves the works and the only satisfactory way is to do this on the hangar with an airscrew. Acceleration from the lowest idling speed and shutting down quickly to see that the engine does not stop are tests that should be made and can only be made satisfactorily with an airscrew. We do not think the suggested flywheel scheme on the test bed is good enough and we find that Bristols have now adopted the airscrew method of tuning their engines before despatch from the works. Ha/A.C.Lovesey. Attached: Hs.{Lord Ernest Hives - Chair}725/6/7/8. | ||