PZL Mielec LLP-M-15 Belphegor
Following an agreement between the Polish and Soviet governments for the design and production of a new large agricultural aircraft, allocated the designation P.Z.L. Mielec M-15, design of this aircraft was initiated in late 1971 and the initial LLP-M15 prototype made its first flight on 30 May 1973. One M-15 prototype and five pre-production aircraft followed, and completion of the development programme was signified by the award of a full certificate of airworthiness on 4 April 1979.
The M-15 had unequal-span biplane wings, twin tailbooms extending aft to twin fins and rudders united by a high-set tailplane and elevator, and fixed tricycle landing gear. A central fuselage nacelle provided accommodation for the pilot and, to his rear, had a cabin to seat two ground crew during ferry flights between operating areas. The single turbofan power-plant was mounted above the fuselage nacelle, and two streamlined chemical hoppers occupied the full gap between each wing, mounted directly beneath the tailbooms, their combined chemical capacity 2900 litres.
Powered by a 3,300-1b thrust Ivehenko AI-25 turbofan, it was also fitted with an Ivehenko AI-9 APU, which provides power for engine starts, refuelling and pumping chemicals into the two 1460-litre hoppers located between the wings. The cockpit was air-conditioned and behind was space for two ground crew and their gear, tools, spares, etc. The upper wing was equipped with a variety of high-lift devices, while the lower wing had nozzles for the dispensing of granular or liquid chemicals.
The cabin normally housed a mechanic or two, but could carry up to 21 passengers for ferry purposes.
Its usual working speed was 80 knots, but it could "dash” to the next job at over 140 knots.
Plans had been made to manufacture 3,000 M-15s, which had been given the name Belphegor during 1979, but production ended in 1981 after only 120 had been built because the aircraft was uneconomical in operation, P.Z.L. producing the turboprop An-3 instead.
Engine: 1 x Ivchenko AI-25 turbofan, 1500kg / 3307 lb
Wing span: upper 72 ft (22 m); lower 49 ft (15 m)
Wing area: 67.9 sq.m / 730.87 sq ft
Length: 13.13 m / 43 ft 1 in
Height: 5.34 m / 18 ft 6 in
Max take off weight: 11686.5 lb / 5300.0 kg
Max. speed: 200 km/h / 124 mph
Cruise speed: 175 km/h / 109 mph
Range: 480 km / 298 miles
Hopper cap: 2500kg
PZL Mielec M-15 Belphegor