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).
Experimental variations and road tests for the Phantom radiator fan.
| Identifier | ExFiles\Box 14\7\ Scan046 | |
| Date | 8th July 1930 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from EFC. X7220. RECEIVED JUL 18 1930 EFC4/ADL8.7.30. X.1017. PHANTOM RADIATOR FAN. With reference to your enquiry re fan, it will be seen from our EFC3/T20.3.25 that an experimental fan (No.15) was handed to the D.O. as being the provisionally best fan from the point of view of power-thrust and speed-thrust performance. Experimental variations of this comprising :- (a) Wider blades (b) Increased angle of attach (c) Increased curvature, and (d) Cutting away of blades i.e. attaching edge rounded away towards tip were suggested for further experimental road tests together with the following variations of drive ratio viz. 1.12, 1.20 and 1.30. Although these drive/ratios were instructed, we cannot trace that these experimental variations, referring both to drive ratios and fan forms, were actually made and the results comparatively tried out on the road. The most important variation from the point of view of increasing the speed-thrust curve or cooling effect, is the increased curvature of the blades up to a point, and it should be remembered that we found that this did not alter the efficiency seriously i.e. efficiency as represented by power-thrust curve. That therefore, should be the principal one made to the present standard fan with the object of improving the cooling effect. The different drive ratios ought, we think, to be tried out in the case of both the present standard fan and any modification of this that is proposed for trial. E.F.C. EFC. | ||