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).
Issues with Wilmot Breeden bumpers, concerning clip breakage and lead weight movement.
| Identifier | ExFiles\Box 118\2\ scan0285 | |
| Date | 26th August 1936 | |
| Hs{Lord Ernest Hives - Chair}/CWH. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X1023 BY.1/G.26.8.36. F.J. Hardy Comments? Rm.{William Robotham - Chief Engineer} WILMOT BREEDEN BUMPERS. ------------------- With reference to paragraph 10 of Hs{Lord Ernest Hives - Chair}/CWH.3/JAB.18.8.36. and dealing particularly with the two points raised viz :- (a). The breakage of the improved type clip FB.2215. (b). Movement of the lead due to its collapse under bolt load. We are looking into the question of the clip to see whether an undercut behind the thread of a reasonable length would help matters before suggesting a larger thread. With reference to the lead weight coming loose Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} has suggested, and is making tests with an anti-monial lead by which the strength of the lead is considerably increased. One other point, however, is that I do not think it is the lead as a whole, but the very much reduced surfaces on which the lead is located at the upper end of the lead weight, and I would suggest testing in parallel a form of washer to fit on the top of the lead weight, so that the lead under the bolt load represents a maximum area. In any case it can be made 6 or 7 times as great in area as it is at present by the addition of a washer, failing this it would mean encasing the lead into a mild steel case. BY.{R.W. Bailey - Chief Engineer} By | ||