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).
Test report graph for 6 cars, including the Goshawk, for the month ending Feb 14th, 1923.
| Identifier | ExFiles\Box 181\M7\ img073 | |
| Date | 14th February 1923 | |
| OF 6 CARS FOR MONTH ENDING FEB. 14TH 1923. TESTS & WORKS UNIT TEST. THE CURVES BEING AN PERIOD AS THE GOSHAWK. F Sy 'H | ||