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).
Proposed design to stiffen the Phantom III pressure oil filter element to prevent collapse, with a request for experiments on different reinforcement options.
| Identifier | ExFiles\Box 135\3\ scan0308 | |
| Date | 8th September 1938 | |
| 1139 BY/NS.{Norman Scott} c. Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} c. Rm{William Robotham - Chief Engineer}/Swdl{Len H. Swindell} S.DA.{Bernard Day - Chassis Design}S/G.8.9.38. PHANTOM 111 - PRESSURE OIL FILTER WITH STIFFENED ELEMENT. Please receive herewith :- E.CD.876 Stiffened Element for Pressure Oil Filter - Phan.lll. This design is proposed in order to overcome the complaint by Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} in respect to the collapse of a number of filter elements in customers use. The drawing shows the gauze reinforced by the addition of three extra ferrules sweated to the inner wire cloth, and also a sheet brass spider fixed in the centre of the unit. It is quite probable that both these stiffening features will not be necessary to make a satisfactory job of the filter, and we suggest that the following experiments should be tried before deciding on the adoption of the scheme. (1). A filter element as standard with the three extra ferrules added, the spider being omitted. (2). A filter element as standard with the spider only added and not the extra ferrules. (3). A filter element with both the spider and the three extra ferrules added. The test should be made by artifically clogging the filter and subjecting it to a high pressure oil flow as experienced in an actual engine. We would point out that the use of the extra ferrules reduces the effective filtration area of the gauze and therefore shortens the time period between cleanings. Will you please instruct for the experiments. Swdl{Len H. Swindell} DA.{Bernard Day - Chassis Design} | ||