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).
Comparing the performance of a pump against an R.A.E. type pump.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan325 | |
| Date | 29th September 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/AR/LG29.9.25. Volume of oil passed in 2 hrs. = .625 pts., giving .312 p.p.hr. Comparison with R.A.E. Pump. Figures obtained with the R.A.E. type pump are given herewith for purposes of comparison. | R.P.M. | R.A.E. Delivery g.p.hr | |---|---| | 700 | Pump begins to deliver. | | 1900 | 64.6 | | 2000 | 71.7 | | 2200 | 77.3 | Lift = 7 ft. Head = 9 ft. Once the R.A.E. had begun to deliver petrol it would continue to do so until the r.p.m. had dropped to 400. These figures show that - (1) The R.R. pump (with relief valve removed and bye-pass plugged) is superior to the R.A.E. pump in that it will start to deliver at 400 r.p.m. as against 700 r.p.m. even with a greater lift and head. (2) There is little to choose between the deliveries of the pumps at normal engine speeds. Hs{Lord Ernest Hives - Chair}/AR. | ||