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.
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 &amp; 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. 
1979 initial production variant.
1987 production variant with a Pratt &amp; Whitney R-985 radial engine.
1992 production variant with a Pratt &amp; Whitney R-985 radial engine.
1980 turboprop variant with a Pratt &amp; Whitney PT6A-11AG.
1997 improved turboprop variant to replace the 620TP with a Honeywell TPE331 turboprop.
Specifications (620BTG).
"Data from" General characteristics* Crew: 1* Capacity: 355 US Gallons (1344litres) hopper* Length: ()* Wingspan: ()* Height: ()* Wing area: ()* Empty weight: ()* Max takeoff weight: ()* Powerplant: 1 × Honeywell TPE331
 turboprop, 500 hp (373 kW) 
Performance * Cruise speed: (, )* Stall speed: (, )* Never exceed speed: (, ) * Service ceiling: ()* Rate of climb: 
References.
Notes.
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