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).
The failure of a triangular stay for the Phantom II front exhaust box and proposed modifications.
| Identifier | ExFiles\Box 14\6\ Scan157 | |
| Date | 11th August 1930 | |
| To BY.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/AJL. c. to MX.{John H Maddocks - Chief Proving Officer} c. to Ds. c. to E.{Mr Elliott - Chief Engineer} Handwritten: X7230 Hs{Lord Ernest Hives - Chair}/AJL.2/WJ.11.8.30. PHANTOM II EGHAUST SYSTEM. Failure of triangular stay for front exhaust box, ref: MX.{John H Maddocks - Chief Proving Officer}12/T23.5.30. We have carried out tests to determine how this failure comes about, and to find out what modification is necessary to rectify it. The distortion of the stay is due to the front expansion box moving forward, there is no lateral movement except that induced by the stay attempting to stop the lontitudinal movement of the front silencer. The forward movement goes on until the front silencer comes into contact with the rear front spring shackle cover. During this forward movement the sliding joint is working in the opposite direction to that for which it is intended, indicating that the cause of the trouble is the back pressure in the silencer, possibly assisted by heat expansion effects. We tried an experiment by stiffening up the stay very considerably, this stopped all distortion, the front silencer was held in its correct position and the sliding joint looked after the expansion by working the correct way. The bracket was stiffened up by bolting some thick angle iron along the two sides of it, strengthening it up in the direction which would resist the forward motion | ||