Vacuum figures and air valve diameter for the Goshawk 11 carburetter.
| Identifier | ExFiles\Box 5\4\ 04-page046 | |
| Date | 25th April 1922 | |
| X.4228. To R. {Sir Henry Royce} from E. {Mr Elliott - Chief Engineer} c. to CJ. c. to Hs. {Lord Ernest Hives - Chair} c. to BY. {R.W. Bailey - Chief Engineer} E2/M25.4.22. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. CARBURETTER. X.4228. With reference to report E2/M13.4.22. Would you kindly note that the figures for the Vacuum in the air valve chamber should have read as follows:- .953 lbs. per sq.in.vacuum - (same as 40/50) .794 " " " " .635 " " " " With regard to the diameter of the lower portion of the air valve on Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. this is 1.05 at present, and is more than large enough for its job on the basis of being pro rata with the 40/50 carburetter but reduced in the proportion of 85 to 55 HP., one inch diameter would satisfy this condition. We have sent a drawing of an air valve - LeC.1557 - with 1.187 diameter lower portion for the Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)), in accordance with your instructions to enlarge the carburetter by this means. E. {Mr Elliott - Chief Engineer} | ||
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).