Conclusions from radiator tests comparing the performance of radiators for the Vulture and Spectre cars.
| Identifier | ExFiles\Box 155\1\ scan0141 | |
| Date | 3rd July 1934 | |
| -4- CONCLUSIONS. Radiator. From above tests it is seen that the Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine) radiator matrix is adequate for dealing with the water heat to be dissipated from the Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine) engine. Below is given a comparison of the heat to be dissipated and matrix area in the case of Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine) and Spectre(Codename for Phantom III) cars. Matrix Area Max. Heat to Water Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine) 57.7 sq/in. 7250 B.T.U's/Min. Spectre(Codename 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 Spectre(Codename for Phantom III) radiator will be adequate for cooling the Spectre(Codename 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(Experimental 6 CYL OHV LONG STROKE / Aero Engine) 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). | ||
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).