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).
Risks of silver soldering brass gallery pipes for the Phantom III and Bentley models.
| Identifier | ExFiles\Box 142\4\ scan0180 | |
| Date | 27th October 1936 | |
| [Handwritten top left] Pacles Rm.{William Robotham - Chief Engineer} [Handwritten top centre] 1203? [Typed top right] BY.7/G.27.10.36. PHANTOM 111 and BENTLEY. -------------------------- Referring to Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}9/JH.16.10.36. there is a decided risk in attempting to silver solder brass to Dixstampo , the melting point of 70/30 brass from which the gallery pipes are made is so near the melting point of silver solder that it is certain on a production basis we shall be in trouble. One further point, however, which determines the policy we should adopt is that we have only looked upon the soldered joint as a method of making a gland. We are well aware that the pipes on chassis and aero engines generally draw themselves loose at one end or the other where they are secured to their fittings, but this is of no moment as the only leakage which results is quite small and does not under any circumstances result in trouble from the point of view of inadequate lubrication of the shafts or big ends. On the aero engine we attempted to braze some of the pipes, and the result was that they broke due to the fact that they were too rigidly controlled, the fact that we have had no trouble in service should be sufficient to show us, that we had better leave well alone. [Handwritten at bottom] Swoll. Surely this is not in accordance with our experience Pim By [Typed] BY.{R.W. Bailey - Chief Engineer} | ||