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).
Issues and potential solutions for aluminium brake drums.
| Identifier | ExFiles\Box 146\2\ scan0110 | |
| Date | 9th February 1937 | |
| W/P to Sr. from Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale} Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale}3/M.9.2.37. Aluminium Brake Drums. With reference to your recent memos Sr3/Crn.3.2.37 and Sr/VA.16/GM.5.2.37, we are pleased to note that you like the brakes on B8GA apart from the contraction crackles of the O.S. drum. The four possible ways of reducing this complaint are 1. Use of a high expansion liner (as fitted to 6 BIV and now scrapped). 2. Copper plating the outside of the liner. 3. Heavier drums. 4. Liner composed of 3 separate rings instead of one. They could not be keyed. In the case of your car in which the front brakes do 20% more work than the drums were designed to absorb, you obviously need heavier drums and you will remember we anticipated your complaint when we sent you the pieces. We will have to send you some more drums when we have got them made. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||