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Jastreb

  The Jastreb (or Hawk) two-seater fully aerobatic trainer was, with the Kometa-Standard single-seater, one of the two indigenous Bulgarian designs that went into production in that country after the war. In much the same class as the ДальшеMore>>> Slingsby T31 Tandem Tutor, the Jastreb was designed by Eng L. Panov and D. Panchovsky, the prototype making its first fight on 6 February 1948; the type was put into small-scale production for the Bulgarian clubs. Of conventional wood and fabric construction, the Jastreb is a braced high wing monoplane with the centre section swept forward 5° at the quarter-chord line to improve the view from the rear seat, the absence of sweep on the outer panels enabling the spar to be uncranked. The wing is a single-spar wooden structure with leading edge plywood torsion box and is 30% fabric-covered; the wooden ailerons are plywood and fabric covered and there are spoilers in the wing upper and lower surfaces. The plywood-covered wooden fuselage has a metal nose-cap and the two pilots are seated in tandem under a sideways-opening Perspex canopy. The cantilever wooden tail unit is covered with plywood and fabric, and the landing gear consists of a fixed unsprung monowheel with no brake and a rubber-mounted skid under the forward fuselage.


Span: 49 ft 2 1/2 in
Length: 26 ft 3 in
Wing area: 209.9 sq ft
Aspect ratio: 11.55
Empty weight: 529 lb
Max weight :850 lb
Max speed: 124 mph (in smooth air)
Max aero-tow speed: 75 mph
Min sinking speed: 2.95 ft/sec at 37 mph
Best glide ratio: 20.5:1 mph