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 reduction ratios for the 'Goshawk II' gearbox.
| Identifier | ExFiles\Box 75\1\ scan0218 | |
| Date | 5th March 1921 | |
| x4247 BY/TWD{T. W. D???Aeith}1/GMK 5/3/21 To. Mr. Hives. "GOSHAWK II" x4247). GEAR BOX - SECTION 6030. As requested, we give below the reduction ratios of the above gear box;- First Speed. - 3.17 to 1. Second Speed - 1.63 to 1. Third Speed - Direct Drive. Reverse - 4.30 to 1. BY/TWD.{T. W. D???Aeith} [Signature] 3.19 # 12.68 | ||