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).
Negative work caused by gas backflow into the induction pipe when the inlet valve opens at 2000 RPM.
| Identifier | WestWitteringFiles\K\December1923\ Scan76 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Exptl. No. 4580 REF: Hsl/Hs{Lord Ernest Hives - Chair}/10. appear that when the inlet valve opens, owing to the fact that at 2000 r.p.m. there is a depression of over 60" of water in the induction pipe in this engine, while the pressure in the cylinder is about atmospheric, gas initially flows from the cylinder into the induction pipe causing extra negative work to be performed. We are still using the original Indicator loaned to us by the Air-craft Establishment - although this works quite well, it has several rather awkward features about it and the light spring cards are not very consistent or clear. We hope shortly, however, to have our own Indicator of improved design when we shall possibly be able to confirm the various phenomena we have so far observed. Hs{Lord Ernest Hives - Chair}/Fm. | ||