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).
Knocking issue in the E.A.C. 7 starter motor and proposing potential solutions.
| Identifier | WestWitteringFiles\S\2April1928-June1928\ Scan060 | |
| Date | 28th April 1928 | |
| 2 HS.{Lord Ernest Hives - Chair} } FROM R.{Sir Henry Royce} EFC. } C. to BJ. BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} ORIGINAL E.A.C. 7. STARTER. R8/M28.4.28. X7625B X7635B I think the recently developed knock is the armature moving endways, due to the engine becoming very free. This would be proved if it did not exist when the engine is cold, and therefore less free. I understand there is no spiral on the teeth. Such spiral might help to hold it in. It would therefore seem that the spring that keeps the armature out of gear may be too strong, or have too high a rating. An examination, and a graph of the current required to keep the armature fully in, and the rating of the pull relative to the current, and the rating of the spring, might be useful. I think the spiral gears if not overdone might prove the better cure. Apparently it is only just wrong, and might be spoilt in another way if overdone - i.e. would not come out soon enough. R.{Sir Henry Royce} | ||