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).
Graph of water flow versus engine RPM for a 3' diameter rotor, large volute, 25 HP pump.
| Identifier | ExFiles\Box 25\1\ Scan017 | |
| Date | 19th March 1932 | |
| WATER FLOW - 3" DIA ROTOR LARGE VOLUTE 25 HP PUMP ◎ FLOW WITH EXISTING STANDARD PUMP FLOW - GALLONS/MIN ENGINE R.P.M. 20 30 40 2000 2500 3000 3500 400 C9 UNIT - J1 HEAD 19-3-32 | ||