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).
Proposed modifications to the Phantom II braking system levers.
| Identifier | ExFiles\Box 12\5\ 05-page158 | |
| Date | 18th November 1929 | |
| Hs.{Lord Ernest Hives - Chair} ) FROM Da.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} ) X7360 Dal/M18.11.29. PHANTOM II. BRAKES. X.7360 X.7420 With reference to the proposal to reduce the direct braking by some 25% by means of increasing the driver lever on the countershaft from 1.375" to 1.725" we suggest that the more correct thing to do would be to reduce the length of the lever on the brake differential shaft. The difficulty with this hitherto has been that there was insufficient room under the cross member to pass the rod. We notice however, on the arrangements that the lengths of both the driven and driver levers on the differential shaft have been increased, thus increasing the torque on this shaft. This is contrary however to our usual practice, but we presume was considered necessary to provide clearance. It appears to us that there is more clearance than is necessary now, and we suggest that you should attempt to get all the required reduction of leverage by shortening this lever. If you cannot gain it in this manner we suggest you should shorten the cam levers. The effect of this will be that the angle of the cam will not need altering so much. The above procedure is more in accordance with our usual practice than lengthening the lever on the countershaft, which produces an appearance of disorderliness on the linkage drawing, and causes you to drop the angle of the cam more than seems quite desirable. Da.{Bernard Day - Chassis Design} | ||