Weatherly 620

The Weatherly 620 is a 1970s American agricultural monoplane designed and built as an improved variant of the Weatherly 201 by the Weatherly Aircraft Company of McClellan, California.[1]

Weatherly 620
A Weatherly 620B in 1998
Role Agricultural aircraft
National origin United States
Manufacturer Weatherly Aircraft Company
First flight 1979
Number built 155
Developed from Weatherly 201

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 either a 355 US gallon hopper or a 320 US gallon hopper that feeds an agricultural dispersal system. Most pilots that fly the weatherly aircraft, prefer the 320 gallon hopper aircraft. [1]

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)
Side view of Weatherly 620B

Data from Jane's All The World's Aircraft 2004-05 [1]

General characteristics

  • Crew: 1
  • Capacity: 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 sq ft (23.1 m2)
  • Empty weight: 3,030 lb (1,374 kg)
  • Max takeoff weight: 6,000 lb (2,721 kg)
  • Powerplant: 1 × Honeywell TPE331 turboprop, 500 hp (373 kW)

Performance

  • Cruise speed: 122 kn (140 mph, 226 km/h)
  • Stall speed: 62 kn (72 mph, 115 km/h)
  • Never exceed speed: 153 kn (176 mph, 283 km/h)
  • Service ceiling: 15,000 ft (4,572 m)
  • Rate of climb: 1,400 ft/min (7.1 m/s)


References
Notes
  1. Jackson 2004, p. 801
Bibliography
  • Jackson, Paul, ed. (2004). Jane's All the World's Aircraft 2004-2005. Coulsdon, Surrey, United Kingdom: Jane's Information Group. ISBN 0-7106-2614-2.
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