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).
Letter from the American branch to Derby discussing a 'Brake Clank' issue and proposed solutions.
| Identifier | ExFiles\Box 16\3\ Scan059 | |
| Date | 19th August 1929 | |
| X7370 ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. OY=1 August 19th, 1929. Mr. Robotham, Rolls Royce Ltd., Derby, England. Dear Mr. Robotham: BRAKE CLANK (underlined) Thank you for your personal "vacation hote" of August 9th, which is of the most useful. I also have a note from Cowen with comments from By.{R.W. Bailey - Chief Engineer} on my notes on servo clank referring to use of a stop on the T lever to meet the suspension arm and prevent servo clank by keeping the servo levers from hitting the stop pins on the servo plate on release. This refers I believe to your work in conjunction with Hallam and is a revival of a proposal of 2 years ago made by you and by Burton here almost simultaneously. Am not quite clear whether we ever tried it here. Anyway we are going to try it, but frankly I do not see how it can offer a permanent cure of the trouble we aim to cure. It seems to me that it deals with effect (underlined) rather than cause (underlined) and ignores the main aim which we think should be to make the servo release simply and silently just as the old non-servo brakes used to do, without the driver (underlined) being aware that any agency other than his foot is applying or releasing the brakes. The ball thrust cam levers certainly have this effect of producing "sensitive" operation. Somewhat on the lines of your suggestion however, we are facing both front and rear stops with fiber to take away any metallic "ring" at closing. -continued- | ||