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).
Recommendation concerning release hole dimensions and armature travel to prevent damper failure.
| Identifier | ExFiles\Box 64\4\ scan0224 | |
| Date | 18th March 1929 guessed | |
| -3- Contd. We have found that the .025" release hole allows about the right amount of energy dissipation to prevent bouncing on the one hand and thumping back on the other. (11) We are recommending for production that contact be made over the last .200" of armature travel, i.e. an amount which exceeds the damper travel by .025". If then the damper sticks (when everything is very cold) at the normal end of its travel, the armature can still move out and bring on the main current so that a possible cause of failure be eliminated. (12) EFC. | ||