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).
Revised design and specifications for the Wraith III radiator.
Identifier | ExFiles\Box 9\3\ 03-page023 | |
Date | 19th March 1937 | |
SECRET. 640 To RY. Copy to Dev. Eng. Rm.{William Robotham - Chief Engineer} Ray/Std. E/RV.3/MN.19.3.37. [Illegible signature] Wraith III Radiator Revised. ---------------------- We send herewith N.Sch.5069 showing the base of the revised radiator for Wraith III, and N.Sch.5077 showing the top portion. A subsequent drawing will deal with the radiator shutters. Referring to N.Sch.5069, it will be seen that the yoke piece consists of a simple channel of rectangular section, either bent into the form of a U or pieced up from three pieces of channel section with gussets at the bottom corners. We would like to know which it would be easiest to manufacture. The radiator bottom tank is a sheet brass pressing carried on one side fixedly by means of the water outlet. This water outlet is a brass casting or alternatively for experiment, a malleable iron casting. The matrix is 58 mm. deep and either Mark V or VI type, depending on the Expl. Dept's recommendations. The radiator mounting shown is that for the original Wraith suspension. The same radiator with a modified mounting would be used with the new open coil spring suspension. The "cuckoo" trap for the starting handle shown on this scheme is the subject of a separate design, Lec.5576, which you will receive in due course. On the recommendation of Rm{William Robotham - Chief Engineer}/Std, we have modified the wing stay attachment. Two steel drop forgings are attached, one each side of the yoke piece by means of electrical spot welding. The wing stay setscrews are KB standard. We do not think they will be satisfactory and would prefer to use the setscrews as originally drawn for Wraith. The thin head of the KB bolt may prove to be inadequate when used as a set-screw, especially by our Coachbuilders. As in the case of the bottom of the radiator so it is in the case of the top shown on N.Sch.5077, that we have carried | ||