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).
Sticking Phantom Cutout valve, its cause, and proposing design modifications with diagrams.
| Identifier | ExFiles\Box 72\2\ scan0202 | |
| Date | 15th March 1926 | |
| To Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} DA.{Bernard Day - Chassis Design} } FROM R.{Sir Henry Royce} c. to CJ. BJ. c. to RG.{Mr Rowledge} Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} PN.{Mr Northey} +8992 R1/M15.3.26. PHANTOM CUTOUT. X. 8490 X. 8992 Our cutout on 7-EX stuck slightly open, .08 about and made a slight extra noise. It was taken down and the bronze casting was found to be distorted, I think by the expansion allowing the valve to overshut and then contract upon the oval valve. Try the casting in iron or malleable iron, bush to avoid spindle rusting, and chance other rust. (Give plenty of end play to spindle if casting in brass or alum.) Arrange screw point as stop for valve, thus - so that it cannot close further than this stop allows, which will push the valve back if contracting on to it, instead of jamming. I think .010 about should be allowed when the valve is shut. Another alternative is to make the disc fit the diameter with stop. This stop will be needed on all the bronze castings out | ||