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).
Comparison of bonnet temperatures between thermostatically controlled shutter and bypass cooling systems at 30 and 60 MPH.
| Identifier | ExFiles\Box 119\3\ scan0206 | |
| Date | 14th September 1934 | |
| X1085 14.9.34. COMPARISON OF BONNET TEMPERATURES WITH (a) Thermostatically controlled shutter system (b) Thermostatically controlled bypass system. Maintained Water Temps. Air Temp. Bonnet Air Temp. (Actual) Top Bottom Mean 30 M.P.H. Light. Shutter System 55 43 49 20 39 Bypass System 58 12 35 20 32 60 M.P.H. Light. Shutter System 62 52 57 20 40 Bypass System 63 21 42 20 32 Hs{Lord Ernest Hives - Chair}/Std. | ||