The second postwar Bulgarian sailplane designed by Eng L. Panov and D. Panchovsky, the Kometa-Standard (or Comet Standard) fully aerobatic Standard Class single-seater flew for the first time in prototype form on 5 August 1960; the type later went into small-scale production for the Bulgarian gliding clubs.
The Kometa-Standard is a cantilever midwing monoplane of conventional wooden construction with a butterfly-type V-tail with an included angle between the tailplanes of 110°. The wings, straight tapered in plan and set at mid-wing position, are single-spar wooden structures with a leading edge plywood torsion box and wing tip 'salmon'-type fairings; the slotted ailerons are fabric-covered and there are spoilers on the wing upper and lower surfaces. They had 4° of dihedral. The Kometa-Standard had mass-balanced, slotted ailerons and spoilers at 60% chord which opened above and below the wing.
The plywood monocoque fuselage has a metal nose-cap and the landing gear consists of a non-retractable wheel with brake and a rubber mounted skid under the forward fuselage. The tail unit is of wooden construction with plywood and fabric covering, and the pilot is seated under a hinged Perspex canopy, proud of the rear fuselage line, but this was lowered and reshaped on the production Kometa-Standard II, merging into the rear fuselage from which it was hinged.
Kometa - Standard II
The cockpit was changed again in the Kometa-Standard III which had a sliding canopy over a reclining seat, making this variant 30 km/h (19 mph) faster than the Kometa-Standard II. Overall, the fuselage tapered uniformly from the cockpit to the tail. The Kometa-Standard had a 110° butterfly tail, its plywood and fabric covered surfaces terminating, like the wings, in little salmon fairings. Its undercarriage was a fixed monowheel, fitted with a brake and assisted by a forward, rubber sprung skid.
The prototype was flown for the first time on 5 August 1960 and an initial batch of 10 Kometa-Standard IIs was built, followed by two batches, each of 10, of Kometa-Standard IIIs. Flown by Bulgarian clubs, they were fully aerobatic, though not cleared for cloud flying.
Prototype LZ-901. 1 built.
Production variant with lowered, rear hinged canopy. 10 built.
Further revision to nose/canopy lines with reclining seat and sliding canopy. 20 built.
Span: 49 ft 0.5 in / 14.95 m
Length: 22 ft 9.5 in / 6.95 m
Wing area: 136.7 sq.ft / 12.90 sq. m
Aspect ratio: 17.6
Empty weight: 573 lb / 240 kg
Max weight: 750 lb / 340 kg
Max speed: 130 mph (in smooth air)
Max aero-tow speed: 93 mph
Min sinking speed: 2.69 ft/sec at 48.5 mph
Best glide ratio: 28:1 at 51 mph
Length: 6.95 m (22 ft 10 in)
Wingspan: 14.95 m (49 ft 1 in)
Wing area: 12.70 m2 (136.7 sq ft)
Aspect ratio: 17.6
Airfoil: NACA 43012A
Empty weight: 240 kg (529 lb)
Gross weight: 340 kg (750 lb)
Never exceed speed: 210 km/h (130 mph; 113 kn)
Rough air speed max: 150 km/h (93.2 mph; 81.0 kn)
Aerotow speed: 150 km/h (93.2 mph; 81.0 kn)
Winch launch speed: 100 km/h (62.1 mph; 54.0 kn)
Terminal velocity: with full airbrakes 220 km/h (137 mph; 119 kn)
g limits: +6.25 -3.3 at 220 km/h (136.7 mph; 118.8 kn)
Maximum glide ratio: 28:1 at 82 km/h (51.0 mph; 44.3 kn)
Rate of sink: 0.78 m/s (154 ft/min) at 78 km/h (48.5 mph; 42.1 kn)
Wing loading: 26.70 kg/m2 (5.47 lb/sq ft)
BCP Mousachevo Kometa Standard II