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).
Proposal for an experimental automatic boost pressure regulator for supercharged engines.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan142 | |
| Date | 9th October 1928 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} C. to HJ. RG.{Mr Rowledge} C. to E.{Mr Elliott - Chief Engineer} WoR.{Arthur Wormald - General Works Manager} C. to DY.{F R Danby} Lr.{Mr Ellor} ORIGINAL Hs{Lord Ernest Hives - Chair}/Tsm1/LG9.10.28. AUTOMATIC BOOST PRESSURE REGULATOR. X4680 X7033 If you are in agreement, the attached sketches shew the method by which we propose trying out experimentally Lr{Mr Ellor}'s scheme for an automatic boost control on S/C. engines. The pressure capsules are in a chamber connected to the induction pipe on the delivery side of the S/C. They are filled with air at 14.7 lbs/sq.in., and adjusted for height on the engine, so as to open the small valve when the boost in the engine exceeds a certain amount. The operation of the small cylindrical valve un-covers ports which simultaneously connect the top side of the piston to the boost side of the S/C. and the bottom side to the suction side of the S/C. above the throttles. Excessive boost makes the piston move down. A slight overlap is provided on the sliding valve so that stable conditions can be reached and to prevent hunting. The piston will be arranged to rotate a cam, which functions as a throttle stop. This is shewn diagrammatically in the smaller sketch. The idea is that when the engine is opened up, the pilot moves the throttle right up the quadrant to the full out position. The action of the cam is to push it back as the boost rises until the boost is reduced to the set figures. The boost control therefore functions as a self-adjusting throttle stop. In doing a climb to the rated altitude, contd :- | ||