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).
The required proportions of .555 and .666 ratio Epicyclic Gears for 'Condor' engines.
| Identifier | ExFiles\Box 38\6\ Scan114 | |
| Date | 26th April 1917 | |
| R.R. 235a (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. X.3389 To EFCt from DA.{Bernard Day - Chassis Design} c. to Mr. Coverley. ------------------- X.3254. X.3399. X.3389. Da{Bernard Day - Chassis Design}2/MB.31118. ----------- Please note that the Air Ministry require the following proportions of .555 and .666 Epicyclic Gears on "Condor" engines. 66% engines fitted with .555 ratio. 34% " " " .666 ratio. and they added - "Should there be any devision from the proportions given, you will receive further notification". Da.{Bernard Day - Chassis Design} | ||