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).
Trialling a Terraplane spring drive in a standard production 20/25 clutch.
| Identifier | ExFiles\Box 21\6\ Scan223 | |
| Date | 11th April 1935 | |
| To RHC.{R. H. Coverley - Production Engineer} x4217 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}24/KW.11.4.35. Clutch Spring Drives. The Terraplane spring drive EX.17693 tried in 21-G-IV and 5-B-IV has been sufficiently successful for us to want to be able to try one in a standard production 20/25 clutch GB.538 (i.e. fabric on the stationary members). Will you please therefore prepare 2 centres that can be tried on test and trials cars. We hand you herewith two further clutch plates bought from the Terraplane people, from which the centres can be extracted as before. If you do not think the type of disked saw steel plate in 5-B-IV a practical job, we suggest the driven plate is bolted on at a diameter just smaller than the saw cuts. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||