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Aviation History
1963
1963 - 1664.PDF
474 H.126 The entire trailing edge of the H.I26 comprises narrow-chord flap and aileron sur faces which, when in the fully down position (below) defect the jet-flap sheet of gas downwards to give a very high lift coefficient. The picture on the right shows the pitch and yaw control nozzles; an anti-spin parachute is installed in the top of the fin FLIGHT International, 12 September 1963 THE Ministry of Aviation has now per mitted Hunting Aircraft Ltd to issue the diagram reproduced on this page showing the flow of gas from the Bristol Siddeley Orpheus powerplant of the H.126 jet-flap research aeroplane. The illustration shows that this journal's own interpretation (April 4, 1963, issue) was essentially correct. As was explained in the earlier issue, most of the efflux from the turbojet is discharged through fishtail nozzles, eight above the flaps and eight above the ailerons. The resulting thin sheet of hot gas provides propulsion and, when the flaps and ailerons are lowered, greatly increases the lift. Some of the gas is discharged through nozzles low on each side of the fuselage, to bring the mean thrust-line down to a normal level; and further supplies feed control nozzles for roll, pitch and yaw as shown in the diagram. The yellow-painted aircraft first flew on March 26. Since then it has slipped slightly in its initial flight-test pro gramme; but this is due principally to the consistently poor weather. Particularly at the low-speed end of its flight envelope, the H.126 requires calm and stable air conditions for accurate measurements to be taken, and this summer such air has usually been conspicuously absent. Most of the initial flying has been done by Air S. B. Oliver, chief test pilot of Hunting Aircraft Ltd of Luton, Beds, subsidiary of British Aircraft Corporation .
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