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).
Performance of a Chrysler-type asymmetrical fan on a 3.5-litre Bentley and proposing further tests with a symmetrical design.
| Identifier | ExFiles\Box 86\5\ scan0006 | |
| Date | 15th September 1933 | |
| X224 To Hs.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} C. By.{R.W. Bailey - Chief Engineer} Da.{Bernard Day - Chassis Design} E.3/HP.15.9.33. 3½ litre Bentley Fan. With reference to Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey}7/KT.14.9.33, we are very interested to note the result you have obtained with the Chrysler type of assymetrical fan on the Bentley car in respect to silence of operation and the small power absorption required. At the same time we think we ought to make a further test with a symmetrical fan having the Chrysler design of blade before committing ourselves to paying royalty. We believe we remember seeing an article about 8 months ago in the S.A.E. journal, in which the conclusions arrived at as the result of experiments were that the assymetrical arrangement of the blades had no real virtue, and that the result obtained was entirely due to fan blade design. An inspection of the shape of the Chrysler fan blade shews that it is designed not to pump air at high speeds, and, therefore, under these conditions it will not absorb the horse-power. We think this type of blade is very suitable for a high speed car, especially as most sporting cars of this type are not fitted with a fan at all. We are, therefore, making a drawing for a symmetrical fan on the lines indicated, with the object of confirming, or otherwise, the result obtained in your test. E.{Mr Elliott - Chief Engineer} | ||