The Weatherly 620 is a 1970s

American American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...

agricultural monoplane designed and built as an improved variant of the

Weatherly 201 The Weatherly Model 201 is a 1960s United States, American Agricultural aircraft, agricultural monoplane designed and built by the Weatherly Aviation Company of Hollister, California. Development In the early 1960s, John Weatherly formed the We ...

by the Weatherly Aircraft Company of McClellan, California.

Design

The Weatherley 620 is an all-metal single-seat low-wing cantilever

monoplane A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes. A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...

with a

conventional landing gear Conventional landing gear, or tailwheel-type landing gear, is an aircraft undercarriage consisting of two main wheels forward of the center of gravity and a small wheel or skid to support the tail.Crane, Dale: ''Dictionary of Aeronautical Term ...

with a tailwheel. Examples have been fitted with a

Pratt & Whitney R-985 The Pratt & Whitney R-985 Wasp Junior is a series of nine-cylinder, air-cooled, radial aircraft engines built by the Pratt & Whitney Aircraft Company from the 1930s to the 1950s. These engines have a displacement of ; initial versions produced , ...

radial engine The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is ca ...

, and

PT6A The Pratt & Whitney Canada PT6 is a turboprop aircraft engine produced by Pratt & Whitney Canada. Its design was started in 1958, it first ran in February 1960, first flew on 30 May 1961, entered service in 1964 and has been continuously up ...

TPE331 The Honeywell TPE331 (military designation: T76) is a turboprop engine. It was originally designed in the 1950s by Garrett AiResearch, and produced since 1999 by Honeywell Aerospace. The engine's power output ranges from . Design and developm ...

turboprop engine, driving a three-bladed tractor propeller. In the forward

fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...

, 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.

Variants

;Model 620 :1979 initial production variant. ;Model 620A :1987 production variant with a

radial engine. ;Model 620B :1992 production variant with a

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 The Honeywell TPE331 (military designation: T76) is a turboprop engine. It was originally designed in the 1950s by Garrett AiResearch, and produced since 1999 by Honeywell Aerospace. The engine's power output ranges from . Design and developm ...

turboprop.

Specifications (620BTG)

References

;Notes ;Bibliography *

External links

{{commons category, Weatherly 620
TYPE CERTIFICATE DATA SHEET NO. A26WE
1970s United States agricultural aircraft Single-engined tractor aircraft Low-wing aircraft

620 __NOTOC__ Year 620 ( DCXX) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 620 for this year has been used since the early medieval period, when the Anno Domini calendar era bec ...

Single-engined turboprop aircraft Aircraft first flown in 1979 Conventional landing gear