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).
Issues with radiator shutters not opening correctly at high speeds on car 22-C-V and the proposed modifications.
| Identifier | ExFiles\Box 101\1\ scan0167 | |
| Date | 21th March 1936 | |
| To RHO. x500a Hs{Lord Ernest Hives - Chair}/Std. S/JH. 21.3.36. Radiator shutters on 22-C-V.{VIENNA} As you are probably aware G.W.H. has had trouble on the above car due to the radiator shutters not opening correctly at high speeds. We have proved that this is to some extent due to the overlap of the shutter blades, resulting in an out of balance effect which causes the wind pressure to tend to close the shutters. We have very much reduced this trouble on GAE-20 car by reducing the shutter overlap, according to detail drawings, this should be .0165". In practice it is more like .060-.100, due to the standard shutter blades not being to drawing. We should like you to do the same thing on 22-C-V while it is in the shop this week-end, in the following manner. Measure the average overlap for the shutters as they are at present, and then reduce the width of each shutter by half the amount of this overlap, by removing all the metal from the leading edge of the shutter. Further, there is an unbalance effect caused by the shell overlapping the two shutters. We should like this reduced to a minimum on 22-C-V by decreasing the radius of the bend of the shell edge so that it folds back on itself, See attached sketch. Hs{Lord Ernest Hives - Chair}/Std. | ||