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).
Procedure for flow testing radiator matrices for various chassis models.
| Identifier | ExFiles\Box 150\2\ scan0102 | |
| Date | 22th September 1938 | |
| 1280 To By. {R.W. Bailey - Chief Engineer} from Rm {William Robotham - Chief Engineer} /Std. c. Hs. {Lord Ernest Hives - Chair} c. RHC. {R. H. Coverley - Production Engineer} Rm {William Robotham - Chief Engineer} /Std.7/MH. {M. Huckerby} 22.9.38. FLOW TESTING OF RADIATOR MATRICES - ALL CHASSIS. We recently discussed with Messrs. Marston the question of flow testing Wraith and future radiator matrices which they supply to us. In the recent past Ph.III, Bentley and 25/30 H.P. matrices have been individually flow tested to ensure that all waterways are up to size throughout their length, this practice having been instituted following the choking up troubles experienced on Ph.III chassis. This has been a comparatively simple operation since the matrices were supplied without any tanks fitted. In the case of the Ph.III and Wraith matrices, however, we now buy these matrices complete with bottom tanks which are dip soldered in position at the same time as the matrices are dip soldered. Since the resistance to water flow of the bottom tank outlet is much greater than that of the matrix waterway (owing to the difference in nett areas) it is not practicable to flow test the matrix with the tank in position, the only alternative being to remove the tank for testing. After discussion with Messrs. Marston, we decided that the best procedure would be for them to take off one tank in 20, after the tanks have been dip soldered to matrices, inspect the waterways and re-dip the tank to the matrix. The only defect of this procedure is that the re-dipped matrix would be slightly heavier ( say 1 to 2 lbs.). As an additional check we should remove one tank in 20 here, making sure that it is not a unit already checked at Marstons, and after inspection return the matrix and tank to Messrs. John Marston Ltd. who will re-dip the tank to the matrix. In this way it would be possible to keep a check on the units being brought from Marstons without sacrificing the advantage of having the tank dipped to the matrix during the manufacture of the latter. | ||