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Aviation History
1989
1989 - 1887.PDF
PARIS NEWS •PHM WWV^k rn^mm Sukhoisfly in: two-seat Su-25 (above), and single and two-seat Su-27 (right) Havoc 'years away' The Mil Mi-28 Havoc attack helicopter displayed at Paris is one of three development aircraft, says Mil general designer Marat Tishchenko. Begun in 1982, development is about 90 per cent complete, he says, but the Mi-28 is still several years from production. The helicopter currently lacks night-attack capability, although television and infrared night vision systems are under devel opment. "Our electro-optics people have fallen behind sched ule," Tischenko admits. The distinctive nose-mounted radome houses a small radar, used to guide beam-riding anti tank missiles. The undemose daylight targeting turret also houses a laser rangefinder and is linked to the front gunner's cock pit by a periscope system. The helicopter is flown from the raised rear cockpit, which is equipped with a headup display. Flight controls are mechanical. Under the nose is a 30mm cannon, derived from a standard Soviet Army weapon for commonality which swivels through +110° horizontally and +13/-45° vertically and can be fired by either pilot or weapon system operator. An unusual Mi-28 feature is a small compartment in the left rear of the fuselage for recovering other crewmembers in an emergency. "It has no seats, windows, or other comforts," says Tischenko. The Mi-28's five-blade articu lated main rotor system is built around a titanium hub, with elastomeric bearings designed and built by Mil, "because there are no manufacturing facilities for elastomeric bearings in the Soviet Union," says Tischenko. Main and tail rotor blades are filament-wound glassfibre- reinforced plastic. The Mi-28 at Paris has a "squashed-X" tail- rotor, similar to that used by the US AH-64 to reduce noise. The main rotor blades have upswept trim tabs to counter what Tischenko calls an "extremely powerful" pitching movement caused by the highly cambered, high-lift blade aerofoil used. Mi-28 take-off weight is 10,400kg—about 1,000kg more than the Apache. Power comes from two 2,200 s.h.p. IsotovTV3 turboshafts, uprated from those in the Mi-24 Hind. • ~s™ KsvMii <il •* .-„-• *^5aS»ssS»s tMMHi MM Mil's unlovely Mi-28 puts on a lively display FLIGHT INTERNATIONAL 17 June 1989 9
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