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).
Secret memo regarding two gear ratios needed for the E.A.C. back axle.
| Identifier | WestWitteringFiles\K\October1923\ Scan123 | |
| Date | 13th October 1923 | |
| TO BY.{R.W. Bailey - Chief Engineer} FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} PA{Mr Paterson} c. to CJ. c. to BJ c. to PN{Mr Northey} ORIGINAL SECRET. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. BACK AXLE. X9350 Regarding the above, two gear ratios will be needed, namely, 25 to 27 M.P.H. at 1000., and about 29 to 31 M.P.H. at 1000., using the present standard road wheels. BY.{R.W. Bailey - Chief Engineer} will find what spiral bevels are recommended. Coarse pitch being preferred. R.{Sir Henry Royce} | ||