Weatherly 620

Design

The Weatherley 620 is an all-metal single-seat low-wing cantilever monoplane with a conventional landing gear with a tailwheel. Examples have been fitted with a Pratt & Whitney R-985 radial engine, and PT6A or TPE331 turboprop engine, driving a three-bladed tractor propeller. In the forward fuselage, the aircraft has a 355 US gallon (1344 litre) hopper that feeds an agricultural dispersal system.

Variants

Model 620

1979 initial production variant.

Model 620A

1987 production variant with a Pratt & Whitney R-985 radial engine.

Model 620B

1992 production variant with a Pratt & Whitney R-985 radial engine.

Model 620TP

1980 turboprop variant with a Pratt & Whitney PT6A-11AG.

Model 620B-TG

1997 improved turboprop variant to replace the 620TP with a Honeywell TPE331 turboprop.

Specifications (620BTG)

Data from Jane's All The World's Aircraft 2004-05

General characteristics

Crew: 1

Payload: 355 US Gallons (1344litres) hopper

Length: 29 ft 8 in (9.04 m)

Wingspan: 46 ft 8 in (14.22 m)

Height: 9 ft 6 in (2.90 m)

Wing area: 277 ft² (23.1 m²)

Empty weight: 3030 lb (1374 kg)

Max. takeoff weight: 6000 lb (2721 kg)

Powerplant: 1 × Honeywell TPE331 turboprop, 500 hp (373 kW)

Performance

Never exceed speed: 153 knots (176 mph, 283 km/h)

Cruise speed: 122 knots (140 mph, 226 km/h)

Stall speed: 62 knots (72 mph, 115 km/h)

Service ceiling: 15000 ft (4572 m)

Rate of climb: 1400 ft/min (m/s)