Pressure injection fuel metering carburettor plus components. On display table perspex case.

The first cure for negative g was to limit the fuel flow under negative g. A standard union was receded to take an orifice plate which was spun into position. Tools and gauges were used to size the orifice. With the numbers involved it was too great a task to flow test every one. Therefore this was done with 1 in 25. There was one fitter employed, Mr. S. Bristow. It was fitted to all Merlin engines in 1941/2. Later other methods were employed.

Pressure injection fuel metering carburettor:

1931: The proposal of Dr. A. A. Griffith.

1935: First tested on the R.A.E. carburettor test plant and later engine bench tests were carried out, fitted to a Bristol Mercury Mk.VI engine.

1937: Improved model of the R.A.E. pressure injector fuel metering carburettor, was produced and developed under the direction of Mr. W. C. Clothier and Miss B. Shilling, O.B.E.

1940-41: Flight development trials with the R.A.E. injector carried out by Engine Research Flight (C Flight), fitted to a Hercules Mk.II engine, installed in a Wellesley aircraft, previouslyused by the R.A.F. for the long distance record attempt.

1944: The R.A.E. injector taken over by H.M. Hobson Ltd. for production.