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).
Conclusions on radiator tests, comparing heat dissipation and matrix area for Vulture and Spectre engines.
| Identifier | ExFiles\Box 14\7\ Scan062 | |
| Date | 3rd July 1934 | |
| -4- Hs{Lord Ernest Hives - Chair}/Std.14/KW.3.7.34. CONCLUSIONS. Radiator. From above tests it is seen that the Vulture radiator matrix is adequate for dealing with the water heat to be dissipated from the Vulture engine. Below is given a comparison of the heat to be dissipated and matrix area in the case of Vulture and SpectreCodename for Phantom III cars. ________________________________________________________________ Matrix Area Max. Heat to Water ________________________________________________________________ Vulture 57.7 sq/in. 7250 B.T.U's/Min. SpectreCodename for Phantom III 580 sq/in. 7280 B.T.U's/Min. (estimated on basis of two Bentley engines) ________________________________________________________________ From this comparison it appears that the SpectreCodename for Phantom III radiator will be adequate for cooling the SpectreCodename for Phantom III car but the value of the comparison is masked to some extent by the difference in gear ratios of the cars. NOTE. By comparison of the figures obtained from the two radiators in these tests, i.e., the Vulture 84 m.m. Harrison Vee bonded matrix and the Ph.II 104 m.m. Harrison Vee bonded matrix on 22-EX car, it is seen that a reduction of 10.5% in area of matrix and of .7" in thickness of matrix has resulted in an increase in temperature difference between air temperature and mean water temperature of 11.6%, indicating that this extra matrix thickness is worth very little, at any rate at speeds as low as 30 m.p.h. (These figures are only approximate as the conditions were not identical for both radiators). | ||