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).
Tests of an automatic boost regulator, detailing initial inconsistent results due to friction and subsequent improvements.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan054 | |
| Date | 11th September 1930 | |
| To R.{Sir Henry Royce} From Hg/ACL. c.c. to Sg.{Arthur F. Sidgreaves - MD} NOR. c.c. to RC.{R. Childs} E.{Mr Elliott - Chief Engineer} c.c. to SV. ORIGINAL Hg/ACL.1/MJ.11.9.30. X4033, AUTOMATIC BOOST CONTROL. We have carried out a number of tests on the Automatic boost regulator employing the floating link - DES.1293 - and obtained curves showing the extent of the compensation. In the first tests we found it impossible to obtain any consistent results. Our aim was to adjust the valve to maintain a constant boost of -1/2 lb/sq.in. at altitude and arrange the stops so that the over-riding of the pilot's lever when put in the full open position on the ground would permit the "take off" boost of + 1.3 lbs/sq.in. being obtained. The latter condition was readily accomplished but whatever setting of the aneroid piston valve we made we could not get two readings the same. This was traced down to the friction offered by the throttle connected ignition advance control - the friction being in rotating the magneto contact breaker covers. We made a test with the ignition disconnected from the throttle controls and operated by an independent control. Considerable improvement resulted and results were much more consistent. We took a curve which forms a fair picture of the operation of the boost regulator from ground running up to rated altitude. | ||