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).
Conclusions and summary regarding radiator shutter overlap and performance issues.
| Identifier | ExFiles\Box 105\1\ scan0255 | |
| Date | 30th March 1936 | |
| -3- Conclusions. (1) The raising of the opening temperature of the shutters under high speed conditions is partly due to the unbalance effect caused by shutter overlap, and partly due to the increased friction of the shutter bearings caused by wind pressure load. (2) Removal of the individual shutter overlap is effective in reducing the trouble, but the unbalance effect caused by the side plates overlapping the end shutters is not of sufficient size to make any alteration here worth while. Summary. We think that this trouble could be reduced on production radiators by reducing the shutter overlap to a minimum. The detail drawings give an overlap of .018". On the radiators which we examined, the overlap varied from .060" to .100" and the average value was .080". Also, the shutter drawing shows a width of shutter of 1.562" +5 but production shutters average a width of 1.605. Hence if the production shutter width was reduced to 1.562" by machining the extra .043" off the leading edge of the shutters, the unbalance effect would be largely obviated and the shutters would still have some overlap. We think that either the scheme should be used or else the production limits should be tightened up so that the overlap does not exceed .018 to .020" as indicated on detail drawings. Hs{Lord Ernest Hives - Chair}/Std. | ||