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).
Radiator performance test results at various speeds and throttle settings with louvres open and closed.
| Identifier | ExFiles\Box 155\1\ scan0139 | |
| Date | 3rd July 1934 | |
| -2- Hs{Lord Ernest Hives - Chair}/Std.14/KW.3.7.34. Radiator Results. (1) 30 M.P.H. Full Throttle. Maintained Water Temp. oC. Bonnet Air Temp. (Actual) Top Bottom Mean Louvres Open 51.5 39.0 45.3 35 Louvres closed 55.5 41.5 48.5 33.5 (2) 45 M.P.H. Full Throttle. Maintained Water Tempt. oC. Top Bottom Mean Louvres open 51.0 39.5 45.2 35 Louvres closed 56.0 42.5 49.5 34 (3) 60 M.P.H. Cruising. Maintained Water Temp. oC. Top Bottom Mean Louvres open 36.5 29.0 32.5 34 Louvres closed 38.0 31.5 35.0 34 (4) Full Throttle - max. speed approx. 92 M.P.H. Maintained Water Temp. oC. Top Bottom Mean Louvres closed 50 41 45.5 36 | ||