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).
Extract discussing failures and proposed solutions for electrical components on the Goshawk II engine.
| Identifier | ExFiles\Box 50\5\ Scan036 | |
| Date | 4th May 1922 | |
| X.4333 Extract from RL/M4.5.22. RE GOSHAWK II. (1) DYNAMO BRUSHES. X.4333. The failure of these have vexed me very much as I gave exact instructions which were not followed, and some one must be made resposible. A certain brand of all carbon brush of Le Carbon make was instructed in several memos, instead I understand a copper-carbon Morganite high conductivity brush was used - result, disaster, loss of money, and disgrace. (2) DYNAMO COMMUTATOR. X.4333. This may have been due to overheating through bad brushes, but our dynamo runs very fast, and should be tested at all temperatures up to 5500 r.p.m. in a quick note to Derby I have suggested short pieces of steel tube (rings) embedded in the end bakelite, also a central tube or the shaft arranged to pull the commutator together end-ways and prevent the end rings spreading; this latter idea seems quite necessary. I always thought this American scheme was not perfect enough but feared to make the work more elaborate. The other small faults suggest more perfect inspection and testing both as units (factory) and after being erected; this we expect will come. (8) ELECTRICAL EQUIPMENT. X.4338. So far 3 points have suggested themselves, i.e. some slight grease on cam of igniter (Hs{Lord Ernest Hives - Chair} and the thinner intermediate brush for the exciting current (EFC). There is also a stronger front support wanted for the battery (Hy{Tom Haldenby - Plant Engineer}), a breakage having been reported on the express cars. This is an easy matter as thicker material only seems to be all that is required. | ||