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).
With sketches comparing the materials and construction of the exhaust systems for the Phantom II and 25 HP models.
| Identifier | ExFiles\Box 104\2\ scan0004 | |
| Date | 28th January 1932 | |
| 85230 BY.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} c. to E.{Mr Elliott - Chief Engineer} Re. EXHAUST SYSTEMS. We appear to be making a more expensive front silencer and intermediate pipe on the 25 HP. than on the P.II, as the following sketches show. Left Sketch (P II): .104 imaculate stainless steel .080 staybrite .064 HR brown Right Sketch (25H): .104 imaculate stainless steel .092 staybrite .104 HR brown The thickness of the front silencer for the 25 HP. is .080" S.P.sch.3286 and the intermediate pipe on the 25 HP.; to By/SS{S. Smith}/19.11.31. In both cases it stated to be unlagged but as the test proved it was not possible to obtain silence without the lagging, therefore should it be necessary to have the more expensive material on the 25 HP. Hs{Lord Ernest Hives - Chair}/GWH{George W. Hancock - Head Chateauroux} Hs{Lord Ernest Hives - Chair}/G.W.Hancock. | ||