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).
Engine throttle movement and its effect on horsepower.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan25 | |
| Date | 26th June 1924 | |
| R.R. 493a (20H) (D.A. 652 20-5-24) J.B.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. 9140 REF. Hs{Lord Ernest Hives - Chair}1/LG26.6.24. To E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} SECRET. EAC. THROTTLE MOVEMENT. X9140 We have carried out a test with 1/5th. throttle opening. We find on the engine we are testing there is 78° movement on the lever from shut to full open position. The throttle was adjusted so that it was 15½° open from the shut position. The HP. obtained with this position of throttle was :- R.P.M. HP. 15½° HP. Full throttle. 530 22.5 30.7 750 23.3 41.8 1000 22.9 53.3 1250 18.75 ---- With the engine running light, no load, with the throttle in this position, the engine ran at 1800 r.p.m. We consider 1/5 opening should be sufficient but every degree makes an appreciable difference. Hs.{Lord Ernest Hives - Chair} | ||