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 radiator temperatures of a Rolls-Royce 40/50 and a Hispano-Suiza during a full-throttle hill climb test.
| Identifier | ExFiles\Box 24\4\ Scan199 | |
| Date | 25th August 1924 | |
| COMPARATIVE COOLING TESTS ROLLS ROYCE 40/50 & HISPANO SUIZA SWINSCOE HILL CLIMB (FULL THROTTLE) AV. SPEED 30 MPH RADIATOR TEMPERATURES °C MILES LEGEND: RR 40/50 STANDARD RR 40/50 NO FAN RR 40/50 NO BONNET HISPANO SUIZA STANDARD HISPANO SUIZA NO FAN HISPANO SUIZA NO BONNET R.{Sir Henry Royce} Bolton 25/8/24 | ||