Tyre circumferences and pressures for a Goshawk speedometer.
| Identifier | ExFiles\Box 81\1\ scan0011 | |
| Date | 6th March 1922 | |
| X3602 BY. {R.W. Bailey - Chief Engineer} from Hs {Lord Ernest Hives - Chair} /TMW. Hs {Lord Ernest Hives - Chair} /TMW1/LG1.6.3.22. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) SPEEDOMETER. X4077 X3602 In accordance with your request today for tyre circumferences, we give below figures for which you ask:- Dunlop Magnum tyre - 820 m {Mr Moon / Mr Moore} /m. Circumference - 8 ft. 7 1/2 ins. Distance covered by one rev. in running condition - 8' 3 1/2" Dunlop straight-sided tyre - 34 " Circumference - 8 ft. 10 ins. Distance covered by one rev. - 8ft. 5 1/4 ins. Tyre pressures - 50 lbs. Hs {Lord Ernest Hives - Chair} /TMW. | ||
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).