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).
Proposal to manufacture Phantom II exhaust silencers using aluminised mild steel instead of Staybrite to prevent surface breakdown.
| Identifier | ExFiles\Box 104\2\ scan0234 | |
| Date | 25th March 1936 | |
| Handwritten top left: WYMAN - Are we in agreement with what is being done? Still waiting to see a sample Rm{William Robotham - Chief Engineer} Stamped top centre: BY/CS. HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Handwritten top right: Reply sent (Signature) Typewritten Title: PHANTOM II. EXHAUST SILENCERS. Typewritten Body: Mr. Hancock has suggested that we should produce two or three silencers for the Repair Department, which in place of using Staybrite in certain parts should be made completely in mild steel and the completed silencer treated by the new process with aluminium. The object of this proposal is to try and avoid the breakdown of the surface, which takes place on silencers which are used under heavy running conditions where the lagged parts of the silencer become very hot, the effect of this heat is probably to introduce coarser growth in the Staybrite, and in ordinary mild steel would result in intense oxidation and scale, but by using the aluminising process this effect would be prevented on the mild steel, external surface. It should be noted, however, that the material cannot be treated before the silencer is welded together, as the aluminium would interfere with the welding of the joints, and therefore the inside of the silencer would have to be protected, it is, however, mainly the external surface which causes trouble when the customer is a fast driver. It should be noted that this remedy is no use when we have the complaint of a customer like a Doctor who does not run fast, that his silencer corrodes away, as in this case it is water condensing in the inside which is the cause of the trouble, and our previous remedy which we have instructed for this should still be used for this particular type of complaint. Handwritten bottom centre: By (Signature) Typewritten bottom centre: BY.{R.W. Bailey - Chief Engineer} | ||