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).
Potential radiator design improvements for the Bentley III, Wraith and Phantom III models.
| Identifier | ExFiles\Box 150\3\ scan0115 | |
| Date | 6th January 1937 | |
| 1280 E. {Mr Elliott - Chief Engineer} from Rm {William Robotham - Chief Engineer} /Std. c. to DA. {Bernard Day - Chassis Design} c. to Ev. {Ivan Evernden - coachwork} Rm {William Robotham - Chief Engineer} /Std5/R.6.1.37. E {Mr Elliott - Chief Engineer} /Da {Bernard Day - Chassis Design} and E {Mr Elliott - Chief Engineer} /Ev {Ivan Evernden - coachwork} , Confirming our conversation of to-day with we think could, with advantage, be incorporated in the design of the Bentley III radiator. Some of the features could also be used on Wraith and Phantom III. (1) Reduced size of matrix - as mentioned in Hs {Lord Ernest Hives - Chair} /Std2/JH. 28.9.36. We think that a 52 mm. Mark VI type matrix of 427 square inch frontal area will adequately cool the Bentley car, alternatively, a 58 m.m. Mark VI type matrix of 395 square inch frontal area should be adequate. If the 58 m.m. block is used we suggest that provision is made so that we can return to 52 m.m. depth with an improved type of matrix. With the reduced size of matrix it should be possible to delete the tunnel tube and run the starting handle below the bottom tank. In order to utilise feature No. (3) below the Wraith matrix would have to be reduced in width by .550 - this would also be quite permissible. (2) Bottom tank formed as a single pressing with a case oval-flanged outlet pipe rivetted and sweated to bottom of same, with support standards attached in a similar manner. Drain cock to be bought out type fixed to bottom water pipe (which could be cast) at lowest point, and separate from outlet pipe. There is a considerable difference in opinion between Ev {Ivan Evernden - coachwork} , DA. {Bernard Day - Chassis Design} and Rm {William Robotham - Chief Engineer} /Std. as to the saving in cost (or otherwise) of this method of construction (the weight saving is indisputable), but we think it is worth while putting up to the Costing Dept. for their decision. This feature could very well be tried out on a P.III or Wraith chassis on a 15,000 miles test if we could have a design for same. (3) Simplified fixing of the wing stays to the yoke as shown on the attached blueprint, suitable for Bentley III, Wraith II and P.III. (4) Increased area of inlet and outlet pipes and bottom tank section if this is practicable. (5) Inlet pipe to conform with the combined fan bracket and cylinder head water outlet which By's Dept. is drawing at the moment. | ||