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).
Progress report on the Spectre model, detailing design considerations for the exhaust system and suspension.
| Identifier | ExFiles\Box 4\1\ 01-page316 | |
| Date | 11th April 1935 | |
| To SG.{Arthur F. Sidgreaves - MD} & SGT. c. to E.{Mr Elliott - Chief Engineer} c. to HY.{Tom Haldenby - Plant Engineer} c. to DA.{Bernard Day - Chassis Design} c. to HV. c. to HJW. +300 Progress of the SpectreCodename for Phantom III. We think that the SpectreCodename for Phantom III is making satisfactory progress. Considering first two points where design is required- Exhaust System. So far in order to reduce the tininess of the exhaust system we have found it necessary to lag the manifolds, front downtake pipe and intermediate box heavily. Our present method of lagging is somewhat costly and unsightly. The Americans make a better job of their lagging, examples of which have from time to time been available. It appears that so much lagging will be required on this car that it is worth getting a proper design for it. The noise insulation scheme which we have fitted to SpectreCodename for Phantom III I reduces the trouble but does not eliminate the necessity for lagging. Suspension. Whatever system of suspension we finally decide on from the numerous parts at present on test, we think that we shall require the hydraulic Auto-lock scheme for the dampers suggested by Mr/Len. We should therefore like this to be designed for the present dampers as soon as possible. The incorporation of this device does necessitate one or two decisions. It appears that it will be exceedingly difficult to incorporate it with the governor control. The opinion of La.{L. A. Archer} Re., OMT., Rn{Mr Robinson} and other Experimental drivers is that we could with advantage dispense with the governor control on the SpectreCodename for Phantom III. The Cadillac has demonstrated that the hand control can be very satisfactory. Some decision will have to be made to enable Design to proceed. | ||