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 Phantom engine cooling fans at Brooklands track.
| Identifier | ExFiles\Box 155\1\ scan0144 | |
| Date | 28th June 1934 | |
| PHANTOM FAN TESTS AT BROOKLANDS TRACK JUNE 26 1934 AIR TEMP TO BOIL 65 60 55 50 45 40 35 30 60 FULL THROTTLE M.P.H. CRUISING. AMERICAN V.P. FAN STAGGERED LEC3766 FAN STANDARD PII FAN NO FAN OLD STANDARD TUBE RADIATOR NO FRONT UNSHIELD C.S.S 28/6/34 | ||