Dimensional changes for a stiffer crankshaft for the Goshawk 11 engine.
| Identifier | WestWitteringFiles\H\March1922\ Scan7 | |
| Date | 17th March 1922 | |
| R.R. 285A (100 T) (S.H. 798, 10-12-20) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 ORIGINAL To Hs. {Lord Ernest Hives - Chair} from E. {Mr Elliott - Chief Engineer} c. to CJ. c. to Wdr. c. to Da. {Bernard Day - Chassis Design} c. to Bx. c. to Mr. Coverley. E2/M17.3.22. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. - STIFFER CRANKSHAFT. X4221 You will recollect that the stiffer crankshaft instructed for Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. had both pins and journals .125 larger in diameter. The webs were .1 thicker and .3 wider than standard. The additional thickness in the webs was obtained by reducing the crankpins .150 in width and the bearings .050 in width. It is important that the neck between the oil retainer at the rear end of the crankshaft flange should also be increased 1/8 in diameter as if this neck should be weaker than the journal it will most certainly result in a breakage at this point. E. {Mr Elliott - Chief Engineer} [Signature] | ||
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).