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).
Test results for the 40/50 HP cooling system efficiency at various speeds, configurations, and mixture strengths.
| Identifier | ExFiles\Box 24\4\ Scan307 | |
| Date | 23th December 1924 guessed | |
| INCREASE IN EFFICIENCY OF 40/50 HP. COOLING SYSTEM WITH SPEED. SHEET 4. 20 1/2" matrix. Road speed. δt % difference from 'A'. Critical atmospheric temperature. 20 M.P.H. - all closed. 82.2°C 'A' 11.8°C 30 M.P.H. - " " 77°C 7.5% better. 18°C 40 M.P.H. - " " 71.6°C 14% better 23.4°C 40/50 HP. WITH 22 1/4" MATRIX AND LARGE SHUTTERS OPEN COMPARED WITH STD. HISPANO CONDITION 30 MPH. Car and Ventilation details. δt % difference from 'A' Critical atmospheric temperature. 40/50 HP. 22 1/4" Matrix. 4 large shutters. Total area 112 sq.in. 62°C 'A' 33°C Hispano - louvres. 60.7°C 2.1% better. 34.3°C AFFECT OF MIXTURE STRENGTH - HISPANO - 30 M.P.H. Std. rad. conditions. Mixture control. δt % difference from 'A'. Critical ats: temperature. Strong mixture. 58°C 'A' 37°C Weak mixture. 63.4°C 9.3% worse. 31.6°C Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||