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).
Fitting a large 4-cylinder engine into the 'Myth' car model, comparing it with the 'Rippletto' model.
| Identifier | ExFiles\Box 109\3\ scan0015 | |
| Date | 18th September 1940 | |
| Nº 1030 Ev.{Ivan Evernden - coachwork} from Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/EAG. Myth 700 Rm.{William Robotham - Chief Engineer}7/ML.18.9.40. re RIPPLETTO. Confirming our discussion yesterday, we are anxious to be able to get the large 4-cylinder engine into the Myth. The Rippletto, which was the car originally allocated to this engine, was an unsatisfactory animal. Either it was made up of Senior rationalised pieces, in which case it came out to 34 cwts, or it was a hybrid mixture of senior and junior rationalised pieces and came out at 28 cwts. In the latter case, it needed a good deal of specialised design, detail and manufacturing attention. If, instead of making the Rippletto the tail-end of the Senior Range, we make it the number one end of the Junior Range, we have a much more desirable car, weighing say, 21 cwts, and one which can be produced at a fraction of the cost of the old Rippletto since, with the exception of the engine, all the parts will come out of the junior programme and, in consequence, be produced in very large quantities. To get the thumper under the Myth bonnet we have got to find 4" and at the moment, potential sources of length saving seem to be :- 1. Pocketing the dash. 2. Reducing the space taken up by the front engine mounting. 3. Reducing the width of the fan. 4. Reducing the thickness of the radiator matrix. If we can make the Myth suitable for the thumper engine by adding not more than 1" to the length of the bonnet, we think that the alteration at this juncture will be well worthwhile. Rm.{William Robotham - Chief Engineer} | ||