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Aviation History
1964
1964 - 0256.PDF
f LIGHT International, 30 January 1964 169 The Mystere 20 flight deck has a large windscreen, well arranged controls and flight instruments fully duplicated in the standard version. There is one small overhead switch panel, Full airline radio, ashtrays and map- pockets are already fitted. Black background colouring gives the latest American "professional look" parachute. Systems controls were excellently grouped so that main and stand-by controls were close together for each service. All windscreen panels were electrically heated. There were two wind- screen wipers, and a large, sliding d.v. window on the left with a seal manually controlled. Engine starting was almost automatic, with one switch operation to perform after the fire had lit. As for basic systems, all controls are fully powered with artificial feel, each surface having a twin-body jack fed by a separate hydraulic supply from each engine. An electric stand-by pump can be switched into either circuit. Utilities are operated from the left system with undercarriage and brake stand-by from the right. Perforated airbrake panels extend from the top of the wing only and may not be used during the approach but, if armed in advance, extend automatically after touch-down as soon as the gear oleos are compressed and the throttles closed. This is for lift-dumping. First pressure on the flap lever extends the leading edges alone to 23°. When flaps are raised, the leading-edges retract last. Trim in all three axes is by off-setting the datum of the spring- feel box. The rudder will have a gyro yaw-damper in series with the pilot's input. The yaw damper is for comfort above 20,000ft and quite unnecessary below that height—a pilot's aid, not a remedy. The ailerons used to have spoiler assistance and two spring- feel levels according to speed, but simple ailerons with a single ungeared spring feel remain, together with trim, to give very com- fortable control and excellent response at all speeds. Limits are set by roll response at low speeds and jack stall at high. Maximum roll rate is 120°/sec. A secondary feel spring centres an aileron using the jack power, if the control rods break on one side. The ailerons can be operated through the trim jack if the rods break between this point and the control column—typical Dassault forethought. Elevator control is fully powered with a hydraulic q-feel pot and separate pitot intake. Trim is by shifting tailplane incidence through a screw-jack. There are two electric trim motors, the primary powerful enough to overpower the secondary. If the primary fails, switching in the secondary also completely isolates the primary circuit and control is through an uninterrupted cable. The feel unit, nick-named Arthur by the French, has a warning light and can be switched off. Blevator angle relative to fuselage remains constant as the tailplane moves, so that in trimmed condition the two are always in streamline. Trimming-out of a control load thus brings the stick back to neutral, so that stick-neutral position, and travel, is the same for any trimmed condition. Elevator power is sufficient to overcome full up or down runaway tailplane, except that flap extension must be limited to 30° for certain e.g. conditions if the runaway is nose-down—more forethought. We took off with six occupants and full fuel at a weight of about 9,680kg (21,5001b). It was the Mystere 20's 99th flight. Rotation and lift-off speed was 125kt, initial climb 130kt, en route climb 250kt. Bigand steered with the brakes until the rudder became effective at 50kt. Angle of attack at low speed was considerable so that the initial rotation was extensive, but the Mystere 20 flew off positively and climbed at a very steep angle as Bigand raised gear and flaps. Control felt completely artificial, as was to be expected, but also exactly right, with excellent response, no break-out force and no perceptible lost motion in the control system. Increasing speed produced a definite out-of-trim stick position which I could easily return to neutral by working the thumb- Dassault's standard eight-seat layout, with cross- sections showing the wing-spar carry-through and entrance door configuration
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