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).
Record of tests carried out on a Goshawk motor, detailing brush position adjustments and results.
| Identifier | ExFiles\Box 35\4\ scan 115 | |
| Date | 5th March 1922 | |
| X.4384 X.4384 - RECORD OF TESTS, CARRIED OUT ON GOSHAWK MOTOR. | No. | Date recd | Work carried out. | Present location. | Brush position on car. | Remarks. | |---|---|---|---|---|---| | 1. Not marked. | 30. 1. 22. | Preliminary tests 1,4,& 5 for purpose of finding best position | On 3-Gos.II. | Brushes believed to have been 2° retard of neutral when motor was taken away. | Gunmetal com. Brass brush-holders. Brush position to be altered. | | 2. | 21. 2. 22. | Brake tests with brushes 75% advanced and fully advanced. Production tests. | In Expl. Lab: | Best position found to be 3.5° advance of neutral, i.e. 8.5° advance of central. | Lab. expl. motor. | | 3. | 24. 2. 22. | Carried thro' preliminary production test. | On 4-Gos.II R's car. | Brush position fixed. About 7° advance of neutral. | All nickel-plated. Brush position to to altered to 3° adv. | | 4. | 25. 2. 22. | Put through brake test to ascertain position of brushes. | On 6-Gos.II | Brush position fixed. About 7° advance of neutral. Afterwards altered to 3° ad. before going on car. | Similar to No.3 | | 5. | 4. 3. 22. | Brake Test. | On 5-Gos.II. | Brush position fixed about 7° advance of neutral. | Brush position to be altered to 3° advance. | | 6. | 5. 3. 22. | Brake tests with brushes set at 7° and 3° advance. Prod. tests. | On 7-Gos.II. | Brush position | Armature exchanged for that of expl. motor. | | ||