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Aviation History
1954
1954 - 0210.PDF
98 FLIGHT I DE HAVILLAND HERON CCtSS TO RADIO INSTALLATIONS TR »« (V.H.F.) AD 97 108 (HF MF) D7092 (A.D.F.) :C£S5 TO PNEUMATIC STEM (PRESSURE REGULATORS. DUCING VALVES. SEPARATORS IOUND CHARGING POINT CANOPY TOP AND D F LOOP HOUSING (SINGLE GLASSCLOTH MOULDING) 2ND PILOT NAVIGATOR RADIO OFFICER HINGED LEADING-EDGE PANELS (ACCESS TO ALL ENGINE AND CONTROL RUNS. RACTABL6 NOSEWHEEL LY CASTORING. SELF ITRING. NON-STEERING HAVILLAND 00," BRACKET-TTPE «TANT SPEED ICREWS. 7 0" DIA. R 250 B.H.P. OE HAVILLAND Y QUEEN SERIES 30 MK 2 INES, UNGEARED UPERCHARGFE NGERS REDUXED KIN PANELS alloy structures, with D-noses, pressed ribs anci fabric covering. In service, the fabric covering is wearing well, and even on the flaps behind the main wheels—where several layers of fabric are used—is not proving excessively prone to damage. The tricycle undercarriage is very similar to that of the Dove, but is stressed for the Heron's greater all-up weight. Light-alloy forged legs are used, supplied by the Lostock works of de Havilland Propellers, Ltd. An Automotive Products air/oil shock-absorber is fitted in the levered-suspension nose leg, which is fully castoring and self-centring. In the series I Heron this unit is protected by a sheet fairing which also carries a landing light. A twin-tread tyre is no longer used on the nose leg for an anti-shimmy damper is now fitted. The main gear employs com pression-rubber shock-absorbers of the type pioneered with the Mosquito. In the fixed-undercarriage Heron they are faired but not spatted. In the Heron 2 the main and nose undercarriage units retract pneumatically, outwards and backwards respec tively, the arrangement being illustrated by the drawings on p. 100. Dunlop supply the wheels, tyres, brakes, and retraction gear. A steel-shoed bumper is carried under the tail. A final note on the Heron structure: before painting, all the company's metal aircraft are burnished all over with portable buffing wheels and a fine abrasive. The distinctive mirror-like finish which results is quite remarkable. Power Plant. The Heron is fitted with four de Havilland Gipsy Queen 30 Mk 2 engines, giving 250 h.p. each for take off. Selection of this engine, which is ungeared and unsuper-
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