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).
Series of experiments for a flywheel vibrations rig.
| Identifier | ExFiles\Box 137\4\ scan0088 | |
| Date | 10th September 1930 | |
| 4634. Hs.{Lord Ernest Hives - Chair} ------- Rg{Mr Rowledge}/Tsn1/DM.{D. Munro}10.9.30. -------------------- FLYWHEEL VIBRATIONS RIG. ------------------------ The experiments we had in view on this were: (1) Check actual out of truth of flywheel at start of tests, and re-check from time to time during tests. (2) Find and compare flywheel periods with different engine mountings, till we can get the flywheel period on the rig at the same speed as in the cars. Rig mounting is adjustable. (3) Compare C.T.V. periods of rig engine when running under its own power and when being motored. (4) Compare flywheel periods + rear part of flywheel. Also get a standard 20 h.p. flywheel out of the stores and find lateral and polar Moment of Inertia + rear part. (5) Determine how many vibrations per rev. the flywheel does. This helps us to find the force responsible. A scriber held against the rear flywheel rim should tell us this, and should also tell us the way the flywheel bends relative to No.6 crank. Also use Ashdown Rotoscope. (6) Run engine with three back conn. rods removed. The push rods must also be removed, and the tappets must be tied up off the cams with wire. The crankpins must have clips round to retain the oil. Incidentally, the effect of this on the C.T.V. period would be of interest. (7) If this does not cure the vibration, we can motor the engine without any conn. rods at all, or with the plain parallel shaft. The vibration this way will be very slight, and it may mean doing the test on the bump in a car where the booming body shows it up. This test should indicate effect of a stiff crankshaft. Other things we could try are bare crankshaft + balance weights, and forcing a bar up the bores of the last three journals to stiffen the shaft. cont'd.{John DeLooze - Company Secretary} | ||