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).
Dry pumping time tests comparing different pipe and filter configurations at various speeds.
| Identifier | ExFiles\Box 17\5\ Scan139 | |
| Date | 15th June 1932 | |
| -2- HS{Lord Ernest Hives - Chair}/M.2/DA.{Bernard Day - Chassis Design}15.6.32.Cont'd.{John DeLooze - Company Secretary} (a) with just a 12' 6" pipe direct from tank to pump. (b) with a metal plate filter and, 3 way tap, in addition to the 12' 6" suction pipe. These showed that the "dry pumping" time at 20 P.R.P.M., was considerably reduced with the 4 cc head, but the advantage diminished at 50 P.R.P.M., and over while the deliveries of the two heads were practically the same up to 2000 P.R.P.M. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ PUMP DRY PUMPING TIME - 250" STROKE _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ SPEED | 12' 6" PIPE | PIPE FILTER & TAP _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ P.R.P.M. | L:Vol 9cc's | H:Vol 4cc's | L:Vol 9cc's | H:Vol 4cc's _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 20 | 3M 5S | 1M 15S | 10S | 4S _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 50 | 35S | 30S | 1M 40S | 1M 25S _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 75 | 25S | 20S | 1M 5S | 55S _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 100 | 16S | 15S | 32S | 32S _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ HS{Lord Ernest Hives - Chair}/W.Bell. | ||