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Ag Cat

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Grumman Ag Cat

Grumman Ag Cat
Role Agricultural aircraft
Manufacturer Grumman
First flight 1957
Introduced 1957

The Grumman G-164 Ag Cat is a single-engine biplane agricultural aircraft, developed by Grumman in the 1950s.



The Ag Cat design has been in almost continual production since 1957. Initial production was through a contract with the Schweizer Aircraft Corporation, who built 2,455 for Grumman between 1957 and 1981.

In 1981 Schweizer bought the rights to the design and continued production under the name Schweizer Ag Cat.

Schweizer sold the design to Ag-Cat Corp. of Malden, Texas in 1995. That company entered banktruptcy and no aircraft were produced.

In February 2001 the design was sold to Allied Ag-Cat Productions Inc. of Walnut Ridge, Arkansas. Allied Ag-Cat are not producing new aircraft although a related company operates a large fleet of Ag-Cats.

The basic airframe incorporates many safety innovations, including a pressurized cockpit to keep pesticides out, air conditioning and a fuselage structure that is designed to progressively collapse in the event of a collision


Ag Cat

The basic model Ag Cat was certified with four different engines:[3]

  • 220-225 hp (164-168 kW) Continental Motors radial engine
  • 240 hp (179 kW) Gulf Coast W-670-240 radial engine
  • 245 hp (183 kW) Jacobs L-4M or L-4MB radial engine
  • 275-300 hp (205-224 kW) Jacobs R-755 radial engine

A total of 400 of this model were produced.

Super Ag Cat A/450

The G-164A became the main model starting with serial number 401. This model featured a 450 hp (335 kW) Pratt & Whitney R-985 radial engine along with a higher gross weight, increased fuel capacity, larger diameter wheels and improved brakes.

Super Ag Cat A/600

The A/600 incorporated the same improvements embodied in the A/400, but was powered by a Pratt & Whitney R-1340 radial engine of 600 hp (450 kW).

Super Ag Cat B/450

The B/450 improved on the "A" model by increasing the wingspan from 35 ft 11 in (10.95 m) to 42 ft 3 in (12.88 m). The fin and rudder were enlarged and the fuselage was also lengthened.

The upper wing was raised on the "B" model by 8 in (20 cm) do reduce aerodynamic interference between the wings and improve cockpit visibility.

Super Ag Cat B/525

The B/525 incorporated the design improvements of the B/450, but was powered by a Continental /Page R-975 engine.

Super Ag Cat C/600

The C/600 first flew in 1976. It is similar to the model B/450 but has its fuselage further stretched to incorporate a 500 US gal (1,892 l) agricultural hopper. The model is powered by a 600 hp (450 kW) Pratt & Whitney R-1340 radial engine.

Turbo Ag Cat D/T

The "D" model is similar to the C/600 but replaced the radial piston engine with a Pratt & Whitney PT6A turboprop powerplant of 680 shp (507 kW).

Turbo Ag Cat D/ST

The D/ST model is identical to the Turbo Ag Cat D/T, but the engine was a Pratt & Whitney PT6A turboprop powerplant of 750 shp (559 kW).

Turbo Ag Cat D/SST

The D/SST model is identical to the Turbo Ag Cat D/T, but is powered by a Pratt & Whitney PT6A turboprop powerplant of 850 shp (634 kW).

Ag Cat B-Plus/600

Introduced in 1982 the B-Plus/600 is powered by a Pratt & Whitney R-1340 of 600 hp (450 kW). It has a the larger hopper of the "C" model

Ag Cat B-Plus/450

Also made available for the first time in 1982 the lowered powered B-Plus/450 is powered by a Pratt & Whitney R-985 of 450 hp (335 kW). This model was available only as a custom order.

Marsh G-164 C-T Turbo Cat

This after-market conversation was created by re-engining the Super Ag Cat C/600 with a Garrett TPE331-1-101 turboprop, de-rated to 600 hp (450 kW).

Mid-Continent King Cat

This after-market conversion of the Super Ag Cat C/600 replaced the 600 hp (450 kW) Pratt & Whitney R-1340 engine with a Wright R-1820-202A radial engine that produces 1,200 hp (895 kW).


Specifications (G-164B Super B Turbine)

General characteristics

  • Crew: one pilot
  • Capacity: 400 US gal (1,510 liters) in forward hopper
  • Length: 27 ft 8 in (8.41 m)
  • Wingspan: 42 ft 5 in (12.92 m)
  • Height: 12 ft 1 in (3.68 m)
  • Wing area: 392.7 ft (36.48 m)
  • Empty weight: 3,150 lb (1,430 kg)
  • Max takeoff weight: 7,020 lb (3,180 kg)
  • Powerplant: 1 Pratt & Whitney PT6A-34AG turboprop, 750 shp (560 kW)


  • Maximum speed: 128 kn (237 km/h)
  • Cruise speed: 113 kn (210 km/h)
  • Range: 172 nm (318 km)