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).
Goshawk 11 controls, suggesting the parts could be made from brass castings.
| Identifier | ExFiles\Box 56\3\ Scan074 | |
| Date | 3rd September 1921 | |
| X4239 To ns.{Norman Scott} from R.{Sir Henry Royce} c. to CJ. c. R3/G3.9.21. X.4239 - RE GOSHAWK 11. I hope you will be able to get a satisfactory set of controls from the drawings which should be with you on Monday morning. The parts for the time being could be made in brass castings or anything R.{Sir Henry Royce} | ||