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).
Modifications to a duralumin impeller for a car supercharger to reduce clearance.
| Identifier | ExFiles\Box 140\1\ scan0075 | |
| Date | 15th November 1934 | |
| +209 To RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Smth.25/KW.15.11.34. Dural Impellor for Car Supercharger. There appears to be considerable clearance between the impellor and the casing in the Graham Supercharger. This is an undesirable condition and leads to inefficiency. In the new impellor will you please increase the blade depth so as to reduce this clearance to .020. The casing will probably require some attention in order to keep the clearance down to this figure all over, and the thrust bearing clearances may have to be reduced. Hs{Lord Ernest Hives - Chair}/Smth. | ||