Archive digitization



Aviation and Diplomacy

Frank Piasecki

NATO 1949-2009 Projekt ekspozycji w Muzeum Lotnictwa Polskiego w Krakowie



Polish Aviation Museum

31-864 Kraków,
al. Jana Pawła II 39
phone: (12) 640 99 60,
(12) 642 40 70
e-mail: info@muzeumlotnictwa.pl

a cultural institution of the Malopolska Region

Małopolska – Kraków Region


Patronage

Kraków Airport







Aeroplane: PZL-106 Kruk (prototype)

PZL-106 Kruk (prototype)
Poland
agricultural plane
1975



  • Technical data


Span 14.8 m (48 ft 6 in)
Length 8.9 m (29 ft 2 in)
Take-off weight 3000 kg (6614 lb)
Maximum speed 211 km/h (114 kt, 131 mph)
Ceiling 4000 m (13,000 ft)
Range 680 km (423 mi)
Armament
Powerplant :
LiT-3S (PZL-3S) 7-cylinder air-cooled radial engine rated at 600 hp (441 kW)

 

Being the first Polish purpose-built agricultural aircraft the PZL-106 Kruk (raven) was designed at the WSK-PZL Warszawa Okęcie by eng. Andrzej Frydrychewicz and his team. An all-metal low-wing braced monoplane with fixed tail-dragger undercarriage. Two-spar wing, fitted with fixed slats, is metal-covered forward of the main spar with fabric covered rear part. The steel-tube welded fuselage accommodates hopper, placed in front of the cockpit.
Special attention has been paid to ensure pilot safety, so the cockpit is an integral assembly mounted to the fuselage truss. To avoid collision effects with electric power lines the wire-cutting blades are placed on the windshield centre frame and main undercarriage struts, while special protecting line is spread between the canopy and the vertical fin. The dust-tide cockpit is fed by filtrated, overpressurised air. A seat is provided behind the pilot for the ground crewman. During ferry flights the cargo bay under the cockpit floor may accommodate the dispersing assembly.
The basic part of the dispersing assembly is the glass-fibre reinforced epoxy-resin laminate hopper placed in the fuselage truss between the engine and cockpit. The filing hatch for dust chemicals in hopper upper part is operated pneumatically by the pilot. In the lower part there is an exit hatch with locks for various dispersing assemblies. The fertilizer-dusting assembly comprises gate box attached to spreader carried on the fuselage hardpoints. The spray system consists of the pomp/filter assembly, hop per feeding underfuselage tube and the underwing spray booms with 90 nozzles.
The aircraft displayed (s/n 05005) is one of seven pre-series machines featuring T-tail. It was first flown in March 1975, almost two years after the very similar first prototype. The LiT-3S radial powering these early planes was the prototype modification of the LiT-3 (Polish-built Ivchenko AI-26) helicopter engine. It became a forerunner of the PZL-3S and -3SR engines used in the production PZL-106 aircraft.
During 1975-1976 these pre-series aircraft were used for flight testing of various engines and agricultural assemblies. One of the Ravens was operationally tested in Egypt. The aircraft displayed was handed over to the Polish Aviation Museum by EADS PZL Warszawa Okęcie in October 2007.

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