Hand-drawn schematic showing a temporary modification to the Goshawk II Propeller Shaft.
| Identifier | WestWitteringFiles\G\September1921\ Scan12 | |
| Date | 7th September 1921 | |
| ORIGINAL X4255 GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) II PROPELLER SHAFT FRONT END These 8 holes to be Drilled in Coldrilling of Test Bed engine Gos II 4 - .187 HOLES 4 - .187 HOLES .093 4 - .187 HOLES AFTER FLATTING CORNER LOCALLY FLAT TO RUN OUT WITH A RAD. ON EITHER SIDE THE HOLES SHOWN IN THE POSITIONS INDICATED ABOVE ARE A TEMPORARY MEASURE TO GET THE EXPERIMENT GOING SEE R7G7921. 7.Sept.1921 | ||
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).