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).
Technical note on engine inertia, wing mounting, frame frequency, volumetric efficiency, and clutches.
| Identifier | ExFiles\Box 178\2\ img176 | |
| Date | 12th February 1934 | |
| -6- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/MA.12.2.34. Cont'd.{John DeLooze - Company Secretary} Engine Inertia. The American engines are so heavy and have such a large moment of inertia that if front engine feet are used to stiffen the frame, the mass of the engine reduces the frequency by more than the increased stiffness raises it. I do not see that we can do much better than use torque reaction dampers to damp the frame and engine simultaneously as we do now. Centre Point Wing Mounting. The front wings and radiator are now mounted Chevrolet wise on all G.M's stuff. It takes the inertia of the front wings (which is considerable) out of the system. I think we should investigate a similar scheme . Measurement of Frame Frequency. This is done on the bump with a number of small projections on the drums in exactly the same way as we used for radiator shake. Volumetric Efficiency. They are just beginning to realize the inefficiency of the normal valve port here. G.M. Laboratory are starting some flow tests on almost exactly the same lines as the ones we carried out. At the moment we are ahead of them here. I feel it is so important in gaining silence and a better slow running job for the same power output that we would do well to make up a complete cylinder head to LeC.3673 and try it on the engine rather than wait for the single cylinder test that may take 12 months. Clutches. The two plate clutch I have so far tried seem to require a tremendous pedal travel. Will investigate this. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||