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Aviation History
1964
1964 - 1193.PDF
668 FLIGHT International, 23 April 19M Far left. Model of Domier Do3l Left, Dornier Do32 Below, Dornier Oo28B HANOVER SHOW . . . Dornier-Werke GmbH, 8 Munchen-Neuabing, Postfach 16, Munich, West Germany. In addition to the already well-known Do32 helicopter and Do28 twin-engined multi- purpose aircraft Dornier are showing two models of the Do31 experimental VTOL aircraft. Of the Do31 the makers report:— "At present two Do31 experimental aircraft are under development at Dornier which for reasons of availability employ two Bristol Siddeley Pegasus engines as the main propul- sion units. "To complement the Pegasus engine in the wing nacelles, it is planned to install 2x4 Rolls-Royce RB.162 lift engines in separate lift engine pods on the wing. The arrangement of the main engines with symmetrically located cold and hot nozzles is determined by the required distance of the jet of hot gases from the fuselage. The lift engines are installed in wing-tip pods so as to effectively compensate the roll moment in case of failure of an inboard engine in the vertical take-off phase. This engine layout entails a relatively simple jet control system which responds quickly in hover and transition flight. For pitch control, high pressure bleed air from the Pegasus engines is ducted to nozzles in the stern, of which two point up and two down. Roll control is effected by thrust modulation of the lift engines and yaw control by swivelling the lift engine nozzles in opposite directions. This system, in which the controls mentioned work practically independently, meets or surpasses AGARD controllability recommendations. The rates of climb and descent are set with the throttle of the Pegasus engines. For attitude control in hover flight a unit developed by the Bodenseewerk Perkin-Elmer is used. The design (far advanced) and construction (already under way) of the Do31 experimental aircraft are being carried out in co-operation with the North German aircraft manu- facturers." Dowty Group Ltd, Arle Court, Cheltenham, Glos, England. Four Dowty Group companies are repre- sented. Dowty Rotol Ltd are showing a P.I 127 main undercarriage unit; P.I 127 power- flying control unit; 748MF main undercarriage unit (half-scale working model); Friendship Dowty (Qoulton Paul) duplex spoiler actuators for Short Belfast main undercarriage unit; YS-11 propeller; Mirage 3V fuel flow proportioner; auxiliary gearbox; ram air turbine; hydraulic pumps and motors: and Mini Hydel valves. Exhibits by Dowty Electrics Ltd are ranges of magnetic indicators, solenoid switches and micro- switches. Boulton Paul Aircraft Ltd exhibit a VC10 and Buccaneer power flying control units; VC10 spoiler control unit; Belfast duplex spoiler control unit; BAC One-Eleven yaw damper and rudder actuator. Dowty Fuel Systems Ltd displays a BS.53 fuel system; Artouste fael system; vapour core pump demonstration rig; inlet guide vane controller; gear pump with mechanical governor; mech- anical governor for two-spool turbine engines; and range of spill flow burners. Both the Belfast spoiler and VC10 aileron units are of the packaged, self-contained type having their own electric motor, pump- actuator and hydraulic oil system. The Belfast unit is a duplex electric-hydraulic actuator of the radial pump type and has electrical signal- ling between the pilot's control column and the unit. VC10 aileron units operate directly by the pilot's command signal, combined pilots command/auto-stabilizer signals or autopilot s signals. Outstanding response characteristics, high sensitivity and compact design are claimed as important features of all these units. Of particular interest are the three under- carriages. For the Friendship the unit is of orthodox design. The P.I 127 exhibit is one of the tandem fuselage-mounted units. The 748MF has a "kneeling" undercarriage which can be adjusted to raise or lower the aircrait or to keep level the fuselage floor and door sill when the aircraft is standing on uneven ground. The Pegasus fuel system is sectioned to show
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