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).
Specification for testing three types of experimental radiators on a bumping rig.
| Identifier | ExFiles\Box 181\M11\ img099 | |
| Date | 18th December 1918 | |
| To BY.DA.{Bernard Day - Chassis Design}& EH. from R.{Sir Henry Royce} -2- R7/C181218 Contd. (1) RADIATORS. Three types of experimental radiators to the following specification should be tested comparatively on the bumping rig:- (1) Round tube radiator with 10 x 120 m/m tubes having slightly expanded circular ends of sufficient length to provide a good soldered joint, the length of the expanded part being greater on the tubes adjacent to the tanks or side plates. The tube lines of the matrix should be arranged as in sketch to avoid dead water. An improved top tank should be incorporated as described later, and the side plates of the radiator should be single and screwed and sweated securely to the bottom tank, as per inner plate of Lec.276. (2) Round tube radiator with 10x120m/m tube fitted with ferrules on each end of sufficient length to provide a good soldered joint, the length of the ferrules being greater on those tubes adjacent to the tanks or side plates. The tube lines of the matrix should be arranged as in (1), and the improved top tank and side plates as in (1). (3) Square tube radiator with 9 x 120 m/m (approx.) tubes arranged with separators at ends in blocks of 16 or 25, the blocks being bonded into the matrix by wires passing completely round top and side plates and bottom tank. The tube lines of the matrix should be arranged at 45° with the horizontal to avoid dead water. A securely fixed inner side plate and an ornamental outer side plate will be required for this radiator. All of the above radiators should be fitted with the latest type of undersphere suspension which has been thoroughly tested on the bumping rig. Endeavour to obtain pressed top tanks. The tank will be formed necessarily with radii on the edges, which are at present sharp. These radii should be reduced to the smallest possible size. The figure anticipated is .250". Sketch shows the appearance of the tank as a pressing before the stock is trimmed away - (Contd.) | ||