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).
Two graphs comparing engine coolant flow rates in Gallons/Min against Engine RPM for different system configurations.
| Identifier | ExFiles\Box 24\5\ Scan249 | |
| Date | 6th July 1944 | |
| GRAPH 1: RAD E7935/6/4 L.H. ENGINE USED Y-Axis: FLOW GAL/MIN X-Axis: ENGINE R.P.M. A.{Mr Adams} VENTURI IN TOP DELIVERY PIPE B. SUCTION SIDE C. AND WRONG WAY ROUND SHEWING ERRORS IN MEASURING UNLESS VENTURI CORRECTLY FITTED GRAPH 2: RAD E79448 6/7/44. MEAN BOTTOM WATER 67° Y-Axis: FLOW GAL/MIN X-Axis: ENGINE R.P.M. A.{Mr Adams} TWO RAD OUTLETS & BOTTOM PIPE. B. STANDARD SINGLE RAD OUTLET C. DITTO FIRST L.H. ENGINE MINIMUM DELIVERY THAT WILL NOT CAUSE OVERHEATING. 23 - .125 HOLES IN OUTLET | ||