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).
Design challenges and proposed modifications for the 'Corniche' exhaust system.
| Identifier | ExFiles\Box 97\3\ scan0117 | |
| Date | 22th May 1939 | |
| BY/NS.{Norman Scott} c. Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} c. Da{Bernard Day - Chassis Design}/JD.{J. Draper - Frames} c. Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} 400C. DA.{Bernard Day - Chassis Design}5/G.22.5.39. "CORNICHE" - EXHAUST SYSTEM. Further to E.CD.1344, E.CD.1354 and E.CD.1362, we send herewith E.CD.1379 Exhaust Tail Pipe - 'Corniche'. Owing to the shape of the body tail and wings, we are unable to carry the tail pipe outwards at its rear extreme, similar to the B.V and we have taken it out at the rear between the chassis side frame and the petrol tank. It will be noticed that clearances for the tail pipe are very small especially with the rebound strap, and also with the rivet heads for the shock damper brackets and the only way to make these clearances reasonable is to shorten the length of the petrol tank on the near side. Will Da{Bernard Day - Chassis Design}/JD.{J. Draper - Frames} please look into this. To obtain a working clearance on the first chassis or two for which petrol tanks are already made, we suggest that the snap head of the shock damper bracket rivets which are close to the tail pipe should be filed away by about .125" as indicated on the design drawing. When the petrol tank is shortened, the distance outward of the tail pipe will be reduced accordingly. The rear support for the tail pipe is the same as used for a previous design E.CD.1151. In order to use in the B.V rear silencer complete, we have had to make an extra bend in the plan view of the tail pipe which appears to be very difficult to produce, the alternative is to make a new outlet pressing from the rear silencer to line up with a common axis of pipe in plan view; if the pipe bending is found to be impractical we will make the alternative design. Will you please detail and instruct experimentally. This completes our designs for the 'Corniche' exhaust system, except for the cut-out valve and operating controls, which are in hand. DA.{Bernard Day - Chassis Design} | ||