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).
The behavior of a high-pressure piston under reduced load, with a corresponding blueprint.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan112 | |
| Date | 15th January 1926 guessed | |
| contd :- -7- The load was then reduced until the high pressure piston just lifted. This occurred in a specific case with 60 lbs. weight. The high pressure piston did not move, as might have been expected, through a large distance and take up a position where the oil was cut off by the small inner piston, but only lifted slightly. The load was further reduced, and at each reduction the pressure piston rose until with 40 lbs. load it has moved through 85% of the distance it would have traversed with no resistance to overcome. From this it appears that the effective pressure P. varies with the size of the cut off gap G.{Mr Griffiths - Chief Accountant / Mr Gnapp} owing to the leak L. being of necessity of appreciable proportions. In effect when cut off, gap G.{Mr Griffiths - Chief Accountant / Mr Gnapp} is the same size as leak L., the effective pressure P. is nothing with an oil of low viscosity. LEAK L. CUT OFF GAP G.{Mr Griffiths - Chief Accountant / Mr Gnapp} EFFECTIVE PRESSURE P. | ||