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).
Difficulty in achieving sensitive control for the Goshawk engine's throttle.
Identifier | WestWitteringFiles\I\July1922\ Scan75 | |
Date | 1st July 1922 guessed | |
To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} ORIGINAL. Hsl/LGS. 7. 22. GOSHAWK - THROTTLE CONTROL. X4228 X4239 The chief difficulty in getting a nice sensitive and gradual control for the Goshawk throttle, is the fact that the butterfly valve becomes stiff and difficult to operate at the very low speeds owing to the friction on its bearings caused by the unbalanced pressure at each side of the valve. At the very tiny throttle openings and with a closed throttle, this is considerable. It means that we need a fairly strong spring to overcome it. We do not need this strong spring except at the first opening of the throttle. We notice that the modified control is arranged so that the spring strength remains nearly constant throughout the range; this should make the control satisfactory. Hs.{Lord Ernest Hives - Chair} | ||