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URMV-3 IAR 821
The IAR-821 is an agricultural crop sprayer and duster aircraft. The design was completed under the leadership of eng. Radu Manicatide in 1967, at IMFCA Bucharest (Institutul de Mecanica Fluidelor si Cercetari Aerospatiale - Institute of Fluid Mechanics and Aerospace Research).
A low-wing monoplane, it featured mixed wood-metal structure, with the fuselage and wing roots built from welded chrome-molybdenum tube, and the outer wings and tail unit from wood. The three-part, self-supporting rectangular wing is attached to the fuselage with a 5 ° angle of incidence. While the wing center part is designed without a V-position up to about 1/3 of the span, the wing ends have a V-position of + 5 °. The wing center section, which runs straight through, has a frame of welded chrome-molybdenum tubes and is clad with metal planking that can be walked on. The outer wings made of wood and covered with fabric also house the two fuel tanks with a total capacity of 130 lt. The front fuselage had aluminium panels, while the rest of the surface was plywood covered with fabric.
The ailerons are also made of wood and covered with fabric. As landing flaps simple slotted flaps are used. The container for 800 kg of spray is located between the fire bulkhead and the cockpit. Both solid and liquid funds can be applied.
The propulsion was provided by an Ivchenko AI-14 RF, a single row air-cooled 9-cylinder radial capable of delivering 300 hp (221 kW), located at the apex of the front fuselage contained in a NACA cowling and combined with a three-blade propeller with fixed pitch. It was with fixed, tailwheel undercarriage.
It was built at IRMA (Intreprinderea de Reparatii Material Aeronautic - Enterprise for Aeronautical Material Repairement), in Bucharest, first flying in 1967. A small series of 20 aircraft was produced in 1968 and 1969, plus a single example of a trainer aircraft designated IAR-821B that had a second cockpit installed in place of the IAR-821's chemical tank, and was equipped with a new chemical tank of smaller capacity (100 lt). The fuel capacity was been increased to 160 lt. This version flew for the first time in September 1968. It was intended that this aircraft should equip Romanian flying schools from 1969, but this did not happen.
The IAR-821 was built until the end of 1969, when replaced by the IAR-822 which had a six-cylinder Lycoming engine.
Engine: 1 × Ivchenko AI-14RF, 220 kW (300 hp)
Wingspan: 12.80 m (42 ft 0 in)
Wing area: 26.0 sq.m (280 sq ft)
Wing profile: NACA 23012
Wing chord: 2.10 m
Wing extension: 6.3 m
Length: 9.20 m (30 ft 2 in)
Height: 2.78 m (9 ft 1.5 in)
Empty weight: 1,080 kg (2,380 lb)
Gross weight: 1,900 kg (4,180 lb)
Capacity: 600 kg (1,300 lb) chemicals
Maximum speed: 212 km/h (132 mph, 115 kn)
Cruising speed: 205 km / h
Application speed: 120-150 km / h
Endurance: 2 hours 36 minutes
Service ceiling: 6,200 m (20,300 ft)
Rate of climb: 8.0 m/s (1,575 ft/min)
Takeoff roll: 130 m
Crew: One pilot

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