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 showing Spectre engine water flows and temperature rise against RPM for different pump configurations.
| Identifier | ExFiles\Box 4\1\ 01-page336 | |
| Date | 13th April 1936 | |
| SPECTRECodename for Phantom III WATER FLOWS S.P. 16 TANK IN PLACE OF NORMAL RADIATOR. 1⅛" BORE PIPE FROM TANK TO PUMP NO THERMOSTATS FITTED. INLET TEMP CONSTANT AT 70°C LARGE PUMP LEC 4162 MOD'F'D CRANKCASE LEC 4074 ORIGINAL SMALL PUMP ORIGINAL SMALL PUMP AND CRANKCASE FLOW LBS/MIN TEMP RISE ACROSS THE ENGINE R.P.M G + M 13.4.36 | ||