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 comparing the performance of different radiator types against engine RPM.
| Identifier | ExFiles\Box 131\1\ scan0008 | |
| Date | 19th May 1921 | |
| .V1142 RADIATOR WITH 268 HEXAGON TUBES STD RAD WITH 4 DENTS IN EACH TUBE SQUARE TUBE RADIATOR DELIVERY GALLS/MIN ENGINE RPM SUCTION SIDE PUMP PRESS lbs/□ DEPN lbs/□ 19-5-21 ReR. | ||