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).
On the Goshawk 11 carburetter, discussing slow running issues with the butterfly throttle and proposing a piston type throttle as a better alternative.
| Identifier | Morton\M1.1\ img072 | |
| Date | 1st October 1921 | |
| E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} ORIGINAL. Hs{Lord Ernest Hives - Chair}5/LG5.10.21. GOSHAWK 11. CARBURETTER. X4228 With reference to your telegram asking whether the slow running with the Goshawk 11. carburetter is sufficiently good on the ordinary low speed jet so that pilot can be arranged for starting only. We can get equal slow running with the ordinary low speed jet as we can with the pilot jet. The difficulty however, is with the throttle. With the butterfly throttle it requires a very minute adjustment in order that the engine can be controlled at the deadslow speeds. We have no doubt in our minds that with a piston type throttle we can get equal slow running. (It might be possible to modify the present butterfly throttle valve in a similar manner to the Zenith. We could make a bye-pass passage which entered the induction pipe through a hole which was hut right off when the butterfly throttle was closed. Since we have been dealing with the butterfly valve on Gohshawk 11. we can appreciate^there are more advantages with the piston type throttle than we realized before.* Hs.{Lord Ernest Hives - Chair} | ||