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).
Instructions concerning dynamo brush spring pressures for the Goshawk engine.
| Identifier | ExFiles\Box 50\5\ Scan196 | |
| Date | 3rd July 1923 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFE Order No: AB.76. Customer's No.: 1 Date: 3 July 1923 X.4333. Dynamo Brush Spring Pressures. The spring pressures of the Goshawk dynamos are specified to be 1.0 lb at each of the main brushes and .75 lb at the control brush. Those on the Standard experimental dynamos in the laboratory agree fairly well with this in their highest position before brush wear commences, but when wear has taken place to the extent allowed by the brush-holders, the pressure is about halved. On No 288 machine, which has been used for brush wear tests, the spring pressures are all .6 lb in the commencing position, and in the present state of brush wear (Cont'd) Signed: | ||