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 John Marston Ltd. discussing the cost, design modifications, and testing of experimental oil coolers.
| Identifier | ExFiles\Box 131\1\ scan0262 | |
| Date | 14th January 1937 | |
| J 2280. 1114 Experimental Department Rm{William Robotham - Chief Engineer}/Std.18/AP. 14th January 1937. Messrs John Marston Ltd., WOLVERHAMPTON. For the attention of Mr.Dunn. Dear Sirs, We are in receipt of your letters of the 11th. and 12th inst. and also through our Accounts Dept. of your Invoice R/110938 of Dec.30th.1936. We note that you have charged us £5. 5. 0. for the special oil cooler - we should like to know whether this refers to the oil cooler with the stiffened top plate to your design or to the oil cooler with the modified top plate to our design (marked E.O.O.) In any case, we consider the charge of £5. 5. 0. excessive as compared with our standard figure of £1. 5.9., in view of the small extent of the modifications to these coolers. We would remind you that the development of a stiffer top plate was undertaken mainly in your interests (since the existing design of cooler as it stands is satis- factory providing it passes our pressure tests) and that we think therefore, that the cost of the two experimental coolers should be shared. We should like to know whether you tested the last special cooler which we received (E.O.O.) for distortion, and how it compared with the first one you sent us. With regard to the standard type cooler which you have forwarded for our examination (the one dipped in recently constructed frame) - judging from an appearance point of view, this appears to be a better job than any previous coolers which we have seen. We have pressure tested this cooler and no failure has occurred up to 200 lbs/sq.in. The fact that coolers made in this manner have been consistently sound so far bears out the writer's view that the hand soldering of the case to matrix is responsible for most of the leakage troubles - we consider that the dipping continued | ||