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 under various driving conditions.
| Identifier | ExFiles\Box 14\7\ Scan060 | |
| 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 | ||