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).
Summary of test results for various radiator matrices, discussing test rig limitations and recommendations.
| Identifier | ExFiles\Box 149a\2\ scan0260 | |
| Date | 6th November 1935 | |
| -5- Hs{Lord Ernest Hives - Chair}/Std.14/KW.6.11.35. (6) Sheet 6 shows the variation in heat dissipation with air speed through the matrix in the case of 52 m.m. and 65 m.m. Mark V matrices. This was obtained by interpolating between the sheets (4) and (5). These two curves follow laws H = K₁v·⁷⁹ and H = K₂v·⁷⁹ respectively, where K₁ and K₂ are constants depending on matrix. This is consistent with the usual index value of .80 and .83. Summary. (1) The test rig as at present in use at Wolverhampton may be used for comparative figures with a certain amount of success, but is open to serious experimental errors when absolute figures are required. (2) The American Harrison Vee bonded matrix is definitely superior to the Mark VI product (the average of the previously quoted figures being 6.7%) and Messrs. John Marston have undertaken to improve their Mark VI matrix to the American standard. (3) The discrepancies between the critical air temperature figures obtained on the rig and under running conditions are ascribable to the 'spill' which takes place around the edges of a car radiator. (The fan, which was not fitted during rig tests, would tend to counteract this effect to a small degree). If it is desired to estimate with accuracy the critical air temperature figure for a car using rig tests, a small scale model of the front of the car from the dashboard forward would have to be used in a small wind tunnel. (4) A rig with the features recommended earlier in this report would give accurate comparisons between matrices and enable development work to be done on them, without using any model of the front of the car in question. Hs{Lord Ernest Hives - Chair}/C.S.Steadman. | ||