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).
Camshaft drive failure and proposed modifications for the Falcon 10 and Condor engines.
| Identifier | ExFiles\Box 43\3\ Scan075 | |
| Date | 14th October 1926 | |
| To RG.{Mr Rowledge} from E.{Mr Elliott - Chief Engineer} c. to BJ. HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} X4003 E1/M14.10.26. FALCON 10. & CONDOR CAMSHAFT DRIVES. X.4003 X.4598 Referring to the camshaft drive which failed on F.10., this type of coupling in which a taper sleeve is forced on to the drive tube and pinned, is used on Condor, and was used on our other aero engines. In this particular case the taper appears to be 1 in 8., whereas we usually use 1 in 20., and put the coupling together with great pressure. It is thought that this particular coupling which failed may not have been assembled tightly enough. Nevertheless Mr. Royce considers that this joint is a weakness which ought to be XXX removed on both F.10 and Condor. As regards F.10. he would like the serrated coupling and the drive tube made out of the one piece of material since the drive is so short, and at the same time he would like the sliding coupling on the other end reduced in weight by making it smaller in outside dia., and making the keyways in the female piece less deep. As regards the Condor this requires different treatment since the drive tube is long, and one method suggested by R.{Sir Henry Royce} for improving it is to plug the tube at the small end of the taper and add a collar to the serrated pot coupling at the large end of the taper. The pieces would still be assembled under great pressure, and some larger taper pins could be passed right through both pieces within the collar thickness of the coupling. | ||