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).
Notes from a visit concerning the experimental Goshawk engine, including cylinder jackets and water pipes.
| Identifier | ExFiles\Box 183\M22\ img127 | |
| Date | 5th October 1920 | |
| R.R. 285A (120 T) (S.H-199, 17-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2830 To Hs.{Lord Ernest Hives - Chair} ) from E.{Mr Elliott - Chief Engineer} H.{Arthur M. Hanbury - Head Complaints} " Da.{Bernard Day - Chassis Design} ) Copy to C.J. " " Wor.{Arthur Wormald - General Works Manager} " " RY. " " EFC. ARMOURED CAR HAND CRANKING / EX H to E EX. with 27 MPG! R.{Sir Henry Royce} SUGGESTS DEMO E.L./08.10.20. 6 EX ? EX - DULL THUD! RE VISIT OF MESSRS. HIVES. AND DAY TO WEST WITTERINGHenry Royce's home town X498 TUESDAY 5th. October, 1920. GOSHAWK. (Most of the remarks apply to other experimental engines, Buzzard and Vulture). The experimental Goshawk engine was brought to Wittering in chassis 6.FX and the following remarks were made concerning it. Cylinder Jackets. X.388. Mr. Royce thinks we should soon get into the way of drilling and tapping for jacket screws. The jacket screw heads could be made much lighter in the washer part. To make the tapping successful in the cylinder, and to obtain the strongest job the cast iron thread should be half the theoretical height, see sketch - (Sketch of a screw thread between Cast Iron (C.I.) and Steel) The tension due to bending moment at the rods of the steel and cast iron threads is then more in proportion to the respective tensile strengths of these two materials. Larger tapping drills should therefore be used for this particular job on the Goshawk cylinders. To overcome any trouble with broken screws due to screw heads not pulling up squarely spherically seated screws and washers could be used, but Mr. Royce thinks these would be more bulky. The sheet-metal covers should be put on with black enamel in the joint and baked. Inlet Water Pipes. X.3566. Mr. Royce thinks we may connect the pipe to the cylinder jacket by means of a union, but retain the flexible joint. The elbox pipe will then not remain on the cylinder casting when the latter is removed from the engine, and will not in consequence, be in danger of being broken off as suggested by Mr. Hives. Contd. | ||