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).
Modifications to brake drums and shoes for 25HP & 45HP cars.
| Identifier | ExFiles\Box 12\5\ 05-page237 | |
| Date | 12th November 1930 | |
| SG.{Arthur F. Sidgreaves - MD} HS.{Lord Ernest Hives - Chair} } FROM R.{Sir Henry Royce} R3/M11.12.30. C. to WOR.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} CAR WORK - 25HP. & 45HP. X.4612. X.7930. X.5930. Handwritten: X7930 BRAKES. There is no doubt that the flexible brake drum was a wrong move, and to stiffen them up as quickly as possible is right. If we can only stiffen them somewhat without the ribs it would be better than making any more of the very flexible ones. Regarding the shoes I have great faith that the lever and pivoted type of brake shoe will prove a very definite advance, and enable our rather overloaded brakes to do their work with very much less distress, especially when we get really stiff drums. Mr. hancock's pivoted flexible tip has now been made into a pivoted shoe and is quite acceptable for immediate production. We have also the complete shoe pivoted as suggested some time ago. This is proving to be equally satisfactory from the point of view of squeaks, and probably much more satisfactory as regards wear and distribution. We are also sending you one or two other modifications of this type. One of the schemes is probably going too far, but will be well worthy of a trial, because it is intended to be self fitting, and I am sure that the present shoes are most unsatisfactory because the liners have to be adjusted to the surface. I have the utmost confidence that when we have picked out the best brake shoes with the new brake drums there will be a marked improvement in endurance and capacity, and behaviour of the brakes, which are I conclude fairly satisfactory at present in the hands of the drivers who only use their brakes reasonably. We shall always have some drivers who have a practice the reverse to my own, inasmuch as they use their brakes unnecessarily frequently through the absence of luffing up. R.{Sir Henry Royce} | ||