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).
Letter detailing the history of flywheel vibration experiments on a 4 1/4' stroke six-cylinder engine.
| Identifier | ExFiles\Box 127\4\ scan0048 | |
| Date | 17th June 1937 | |
| 1097 Experimental Department Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}22/AP. June 17th 1937 A.Taub Esq., Vauxhall Motors Ltd., LUTON, Beds. Dear Mr.Taub, Mr.Robotham has asked me to send you the history of our flywheel vibrations. All the experiments refer to a 4 1/4" stroke 7 bearing six cylinder engine. The story is briefly - (1) Flywheel G.53692 with an unbalanced crankshaft had a bad wobble at 3100 r.p.m. (2) Any system of balance weights in which the weight on No.12 web balanced that web, half the crankpin, and half the conn. rod eliminated the vibration. (3) The flywheel GL.{G. Linnett}475 on an unbalanced shaft raised the period a few hundred r.p.m. but increased the intensity. (4) An outboard bearing GL.{G. Linnett}493 in conjunction with GL.{G. Linnett}475 was still a rough engine. (5) An outboard bearing on G.53692 flywheel removed the vibration. (6) Flywheel LeC.2830 on an unbalanced shaft had a period at 3800 r.p.m. (7) Flywheel G.54793 on an unbalanced shaft had a vibration at about 2000 r.p.m. less in intensity than G.53692. (8) Flywheel G.54793 with a crankshaft having 60% balance of the revolving parts was free from period. This was standard on 20/25 cars for several years until (9) Flywheel G.57097 on a 60% balanced shaft was introduced. This is free from periods up to 4300 r.p.m. continued | ||