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).
Issues with Aneroid type boost gauges and a proposed solution using an isolating tap.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan137 | |
| Date | 5th October 1928 guessed | |
| contd :- -2- the boost would be maintained with this arrangement, but is not with a gate throttle. Tests with Aneroid type boost gauges with engines on the bed have shewn that it does not pay to subject the capsules to large extremes of pressure, as when ticking over, or they take up a permanent set. Lr.{Mr Ellor} therefore suggested the provision of a tap in the pressure lead to the boost gauge, connected to the throttle, so as to turn off when the throttle is closed. This has been found to prolong the life of Aneroid boost gauges almost indefinitely, and to eliminate the trouble of a changing zero error from day to day, when running on the ground. We have therefore provided an isolating tap in this scheme, to disconnect the capsules from the induction pipe and connect them to the atmosphere at small throttle openings. The same tap would protect both regulator and boost gauge on the machine. Hs{Lord Ernest Hives - Chair}/S.S.Tresilian. | ||