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).
Production test results sheet for Goshawk starter motors, test number 1.
| Identifier | ExFiles\Box 35\4\ scan 091 | |
| Date | 29th March 1922 guessed | |
| X4384 X.3604 - PRODUCTION TEST RESULTS. GOSHAWK STARTER MOTORS (TEST 1). Motor No. | Amperes. | Volts. | Speed. | Speed/Volts. | Springs. | Remarks. 1 | — | — | — | — | — | Tests to find best brush setting only. 2 | 12.0 | 4 | 2,535 | 634 | — | Brushes 3° advanced " | 11.2 | 6 | 3,890 | 648 | — | " 3 | 13.2 | 4 | 2,800 | 700 | — | Brushes 7° advanced. " | 14.0 | 6 | 4,040 | 673 | — | " 4 | — | — | — | — | — | Not tested. 5 | — | — | — | — | — | " 6 | 13.6 | 4 | 2,240 | 560 | — | Brushes 3° advanced " | 12.8 | 6 | 3,600 | 600 | — | Brushes rather loose in holders. | ||