Comparison report between a proprietary B.80 water pump and a Vauxhall 25 water pump.
| Identifier | ExFiles\Box 149a\3\ scan0262 | |
| Date | 10th April 1940 | |
| Rm. {William Robotham - Chief Engineer} c to Ey c to Rm {William Robotham - Chief Engineer} /HH. c to Rm {William Robotham - Chief Engineer} /Col. File 1269 Rm {William Robotham - Chief Engineer} /Ed. {J. L. Edwards} 1/GH.10.4.40. C.I.V re WATER PUMP. ---------- A comparison has been carried out between the Vauxhall 25 water pump and our latest B.80 pump to SCD.1398. Photographs showing the component parts and a weight analysis are attached, and general conclusions appear to be as follows:- 1. The R-R pump comprises 15 pieces against the Vauxhall 10 pieces (one piece not shown). This is chiefly due to two items. (a) Vauxhalls use a cast-iron casing eliminating the necessity for bearing block required when an aluminium case is used. This saves two pieces A & B. (b) The sealed gland assembly was considered inadequate and was replaced by separate bearings, and this accounts for four extra pieces, viz. two bearings, a distance piece and a spindle. Allowing for the above, the R-R pumps have basically one piece less than the Vauxhall design. An alternative design has been suggested incorporating a sealed bearing with this gland assembly, but we do not think that the cast iron bearing block can be omitted, if an alum. case is to be used. A cast iron case would be approximately 5 1/2 lbs. heavier. 2. The R-R pump is lighter than the Vauxhall, due to the cast iron case used on the latter. 3. The R-R rotor is 50% heavier than the Vauxhall, and somewhat more complicated. Also we use phophor bronze, where Vauxhall use cast iron. We propose to put a cast iron rotor in hand of lighter design, and should be glad if Rm {William Robotham - Chief Engineer} /HH. would prepare a drawing. - continued - | ||
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).