Early engine testing procedures
These photographs are likely to date from 1952 but could be as late as 1955.
Left : Testing a compressor, in this case a Proteus unit, driven by an independent source of power.
Right : An Avon turbine on test at N.G.T.E.; fed by hot or cold air from a plant compressor, its power output is measured on a dynamometer.
Engine performance estimates derived from component tests are checked by
installing a complete engine in a flying testbed. Here a Conway bypass turbojet is mounted below the
belly of an Ashton flying testbed.