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).
Testing of a 12-cylinder engine for torsional vibration, particularly for use in speed boats for Sir Malcolm Campbell.
| Identifier | ExFiles\Box 43\4\ Scan339 | |
| Date | 11th May 1932 | |
| X4024. HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer} ) E ) FROM R.{Sir Henry Royce} DA{Bernard Day - Chassis Design} ) Le-Canadel. R/FD{Frank Dodd - Bodies}/II.5.32. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} Re I2. Cyl Engine. As we use I2.cyl on speed boat, and also propose same for Sir Malcolm Campbell, and also for other work, it would be good to test say,one with carbs in V, or supercharged, at full engine torque and light, all the way from 150.revs to 3,000, to ascertain if the periods,(master and others) make the engine rough or dangerous at any speed. My impression is, that 6.per revs has very little to put it in a state of torsional vibration, and there is more damping than 6.cyl. (Hs{Lord Ernest Hives - Chair}/Gylls) seems to think the master period, and may be bad, we all know we shall have to pass it. ( the engine ^when tested should have clutch or flywheel direct on crankshaft. R.{Sir Henry Royce} | ||