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).
Letter to Messrs. John Marston Ltd. discussing heat dissipation test results for defective engine cores.
| Identifier | ExFiles\Box 131\1\ scan0362 | |
| Date | 28th October 1937 | |
| 1114 ? A Rm{William Robotham - Chief Engineer}/Std.15/MH.{M. Huckerby} Messrs. John Marston Ltd., Wolverhampton. 28th. October 1937. For the attention of Mr. Dunn. Dear Sirs, We thank you for your letter of the 23rd. inst. and have noted the contents of same. With regard to the heat dissipation figures etc., we have now tested two of the supposedly defective customer's Mk.VI cores on a car, while you have tested all three on your dissipation plant. The results do not check up, in that block No. J.20 is up to the standard of a new matrix, both on road and test plant tests, while block No. C.94 is deficient in cooling on the road test but is up to standard on test plant tests. Both blocks Nos. C.94 and K.94 are down on flow test (60 G.P.M. for each against 75 G.P.M. for new matrix) yet they give results on test plant equal to a new matrix. The only explanation of this, we think, is that your tests are conducted at a fixed water flow instead of under a fixed head, i.e. if the latter was used, the silted up matrix would pass less water and less heat would be dissipated. In order to check up on this we have asked you to Kyrae C.94 block and retest same. Further when the writer visits your works shortly in connection with oil coolers, he will bring K.94 block with him and would like you to test it against a new Mk.VI block subjecting it to the same head of water which will give 75 G.P.M. | ||