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).
Summary of radiator test results comparing different fans and cowlings.
| Identifier | ExFiles\Box 149a\3\ scan0187 | |
| Date | 21th September 1936 guessed | |
| SUMMARY OF RADIATOR TEST RESULTS. TEST CONDITIONS Fan Used | Pulley Ratio | Cowlings used | Other Details | Air Temp. to Boil - °C (1) Standard Fan | Standard | Front & Rear | Standard Bonnet | (a) 40 MPH. 21.5 (b) Full Speed 20.0 (2) Standard Fan | Standard | Front only | Standard Bonnet | (a) 25.0 (b) 24.0 (3) Standard Fan | Standard | No Cowls | Standard Bonnet | (a) 23.0 (b) 24.0 (4) Copy of rigid Cad. Fan (4 blades). | Standard | No Cowls | Standard Bonnet | (a) 27.5 (b) 26.0 (5) -do- | High Speed | Front & Rear | Standard Bonnet | (a) 36.0 (b) 23 - belt slip (6) Cadillac Rigid Fan (5 blades). | Standard | No Cowls | Standard Bonnet | (a) 28.5 (b) 26.5 (7) Cadillac Rigid Fan | Standard | No Cowls | Standard Bonnet & Wire Mesh Grille | (a) 26.0 (b) 25.0 (8) Cadillac Rigid Fan | Standard | No Cowls | No Bonnet | (a) 32.0 (b) 30.5 (9) Cadillac Rigid Fan | Standard | Front Cowl | Standard Bonnet | (a) 26.5 (b) 26.0 NOTE: All tests without shutters fitted. Full speed tests approx. 88 M.P.H. | ||