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).
Alterations to brake levers, the effect on wire rope travel, and the elimination of footbrake squeak.
| Identifier | WestWitteringFiles\H\January1922\ Scan15 | |
| Date | 26th April 1917 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. (2) deflection to 54% of it's present value: (my original levers for these shafts were 2", and the shaft would be used through 1 1/2 times the angle - see Goshawk 1.) In altering the levers, as pointed out to Da.{Bernard Day - Chassis Design}, the back axle levers should be allowed also the same amount. This will result in wire rope travel being increased 25%, with corresponding less load. I do not know any disadvantage of this small alteration. It is of no use referring to M.{Mr Moon / Mr Moore} Perrot's stresses as ours are entirely different levers. However, I understand from Da.{Bernard Day - Chassis Design} that the shaft could not be overstressed as at present arranged, the only fault being flexibility causing loss of motion. I quite agree with doing all we know to the brakes that will not delay production, but as they stand they are extremely good, and there are always limitations of time, cost, materials, and amount of squeak. We understood that when the footbrake was changed over to where it was originally intended, the squeak disappeared from the footbrake which was the only one which mattered. R.{Sir Henry Royce} Yff | ||