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).
Experiments to diagnose flywheel and crankshaft vibrations, including specifications for a standard flywheel and clutch.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan130 | |
| Date | 20th October 1930 | |
| (2) To make sure that the flywheel vibrations are not due to proximity of the master torsional period we towed the car with the valve gear missing. The engine was quite smooth after the flywheel period up to 4600 R.P.M. where the fringe of the master period could be felt. The master period is therefore not important until 40 M.P.H. in second, 60 M.P.H. in third, or 90 M.P.H. in top gear. As an attempt to cure these vibrations we fitted a steel plate inside the flywheel to stiffen it for bending (the car being towed with no pistons or conn. rods), but this made no difference to the speed of commencement of the period. We shall therefore try towing the car with no flywheel at all and only a bare crankshaft to find out whether the supposed flywheel vibrations are really crankshaft or crankcase vibrations. Particulars of standard flywheel and clutch by recent experiments. - Mass = 35.5 lbs. c. of g.{Mr Griffiths - Chief Accountant / Mr Gnapp} is 1.03" from crankshaft flange. Moment of inertia about diameter through c g = .355 slugs ft. Polar moment of inertia. = .545 slugs ft². Ha/H.{Arthur M. Hanbury - Head Complaints} Grylls. | ||