Back Groen Hawk H4


Groen Brothers has been working on its Hawk Gyroplane family since 1986. Prototypes leading up to the Hawk 4 include the Hawk I and H2X. The Hawk 4 Gyroplane is the first in a series of near VTOL-capable aircraft and is initially being developed and marketed to government agencies, with FAA certification not expected for at least two years. The RevCon 6G technology demonstrator uses the fuselage of a Cessna 337 as the basis of its fuselage and will be progressively modified into a gyrodyne by the addition of rotor blade mounted tipjets; Groen has offered its GyroLifter gyrodyne to the US Department of Defense. The company has a flight test facility at Buckeye, Arizona, where, on 12 July 2000, the prototype Jet Hawk 4T / Hawk 4 made its initial flight.

In July 2001, Groen announced plans to move to a new 18.580m2 facility at Phoenix, Arizona. The plant, which will cost US$14 million and employ 425, was intended to become operational by end 2002 and have the capacity to produce four aircraft per day, however this has lapsed.

In August 2001 the company concluded a joint venture with Al-Obayya Corporation to produce and market gyroplanes in Saudi Arabia. However, economic downturn of late 2001 resulted in 85 of 130-strong workforce being laid off. Earlier plans for Chinese assembly also appear to have lapsed.

Groen is also the parent of American Autogyro (AAJ), whose Sparrowhawk is described elsewhere.


TYPE: four-seat autogyro

PROGRAMME: Based on proof-of-concept Hawk One (N4379X) first flown 26 September 1992; design started April 1996 and prototype two-seat H2X (N4412X) first flew 4 February 1997; later converted to three-seat Hawk III standard. First deliveries had been due June 1998, but design changes to H2X and later Hawk III in October 1998 resulted in Hawk 4. Initial aircraft (N402GB) first flew 29 September 1999, powered by a Continental piston engine, and made first vertical take-off on 9 December 1999; had flown 120 hours in 200 sorties by early April 2000. In September 2000 company switched certification effort to turbine-powered Hawk 4T (N403GB), which was renamed Hawk 4 at this time following abandonment of piston-engined version; the following October Groen changed its focus to seek government contracts for Hawk 4, slowing certification process for both piston- and turbine-powered versions until it sees market upturn.

On 28 December 2001, Groen announced contract with Utah Olympic Public Safety Command for lease of Hawk 4, beginning 20 January 2002, for security patrols at Salt Lake International Airport, equipped with video downlink system, Spectrolab SX-5 searchlight and additional radios; aircraft flew 75 hours in 67 operations.


  • Hawk 4: Currently powered by 313kW Rolls-Royce 250-B17C turboprop; first flew (N403GB) 12 July 2000; originally intended for certification late 2001. Other changes include addition of underfins and taller landing gear. Two further prototypes under construction.

    Applications include airborne law enforcement., electronic news gathering, aerial surveillance, utility/passenger transport and aerial application.

  • Jet Hawk 4T: Original designation for turbine-powered version. Renamed Hawk 4 by 2002.

  • Hawk 8: Proposed eight-seat variant with four-blade rotor and 559kW turboprop engine.

CUSTOMERS: By May 2003, deposits on 148 aircraft had been taken, via 12 dealerships. Fractional ownership programme announced July 2001 but later dropped.

COSTS: Around US$749.000 (2003).

DESIGN FEATURES: Twin tailbooms supported by stub-wings which also house main landing gear; large twin stabilisers and rudders; with fixed horizontal tail surface mounted between the vertical tails. Two-blade, semi-rigid aluminium teetering rotor with swashplate. Rotor speed 270rpm.

FLYING CONTROLS: Patented collective pitch-controlled rotor head allows smooth vertical take-off (zero ground roll) and enhanced flight performance. Rotor brake is standard. Actuation by pushrods. Patented dual-control stack cyclic flight controls.

STRUCTURE: Steel mast and engine mounts; stressed skin aluminium semi-monocoque fuselage, tail unit, hub structure and propeller; composites nose, engine cowling and wingtips; acrylic windscreen and doors; glass fibre nosecone and engine cowling.

LANDING GEAR: Initially fixed tricycle type; with electrohydraulically operated retractable gear to be offered later. Mainwheel tyres 6.00x6; nosewheel 5.00x5; Cleveland hydraulic brakes. Twin safety wheels at rear of tailbooms.

POWER PLANT: Production prototype for Hawk series was powered by a 134кW Textron Lycoming O-360-A4M flat-four. Hawk H2X had one 335kW Geschwinder V-8 aluminium liquid-cooled engine, derated to 261kW at 2.500rpm, driving a Hartzell three-blade constant-speed propeller.

Hawk 4 piston-powered version has air-cooled, six-cylinder Teledyne Continental TSIO-550 rated at 261kW at 2.700rpm; prototype had four-blade MTV propeller but production models will have Hartzell three-blade constant-speed propeller. Engine provides power to rotor for prerotation to provide for short and vertical take-off capability; power to rotor system never engaged during flight. Hawk 4 turbine-powered version has one 313kW gas turbine engine driving three-blade constant-speed propeller.

Fuel capacity 284 litres in single tank at rear of fuselage; refuelling point at top of fuselage. Oil capacity 11.4 litres.

ACCOMMODATION: Pilot and up to three passengers in enclosed cabin in two pairs of seats; rear seats fold to provide baggage space.

SYSTEMS: Electrical system 28V DC.

AVIONICS: Comms: Honeywell KLX 135A GPS/COM, KT 76A transponder with Mode С, РМ 3000 intercom. Flight: United Instruments suite.


Technical data for Hawk H4

Rotor diameter: 12.80m, fuselage length: 7.31m, overall height: 4.11m, empty weight: 835kg, max. take-off weight: 1587kg, max. speed: 238km/h, cruising speed at 75% power: 212km/h max. rate of climb at sea level: 457m/min, service seiling: 4875m, take-off run: 8m, range with max fuel at 75% power: 584km


Comments1-20 21-40 41-60
Alberto Montano, e-mail, 14.04.2022reply

I am from Quito, Ecuador, South America. I am interested on a HAWK 4; can you please let me know if it is possible to buy one here and what would be the cost and option. I will appreciate your answer.

Gary Parks, e-mail, 14.07.2021reply

Is Groen It's still in business I hope not I hope they fall fat on your ass it's all federal ass they are some hypnoxious main hateful people main hate from people I'm letting myself smell up it's just not that the Chihuahua Valley airport and it came out and chewed me out they came out and chewed me out and told me I couldn't pick off the car stair port belongs to them

Konstantinos Sokoridas, e-mail, 28.02.2021reply

Please let me know if Hawk 4 available for sale and the price??

Larry W. Harrison, e-mail, 26.11.2017reply

I would like to get information on buying a used hawk 4 please send all information on the above hawk 4.

Carpenter Y. Arpa, e-mail, 21.08.2017reply

Interested in being a distributor for this Aircraft here in the Philippines?

Carpenter Y. Arpa, e-mail, 20.05.2020 Carpenter Y. Arpa

Also interested in learning to fly this aircraft being certified and owning one, as a Distributor.


Frederick Muller, e-mail, 04.07.2017reply

Is the Hawk 4 (Groen Aeronautics) still in production? I understand there is a newer model. Whom can I contact for information?

David Boggs, e-mail, 10.10.2016reply

what is the price of this - - and where can i buy one

erbay, e-mail, 13.09.2016reply

How greetings price

Freddy Mendizabal, e-mail, 19.07.2016reply

Our Company are in process to acquire a 4 seats Gyroplane request for info on
Hawk h4 present sale dealer price and technical details.
Mentex Aircrafts

Thomas Russell, e-mail, 10.05.2016reply

I live in Edmonton Alberta Canada and am wondering what license do I need so I can fly one of your 3 or 4 seated gyro machines?

ali mirzaloo, e-mail, 29.12.2015reply

hello ,i saw your really beautifull& strong six cylinders gyro .would you please let me know how i costs each one?may i be your share (my mean the first one )in my country please let me know. i hope this will happen very soon. i,m retired of air force .i have A&P E(instrument)&also i got my license from USA(lack land AF base)i,m familiare witch CHIct to markets in NOOK CH47-C,214-c,412.2seats ultra light TECNAM. in- respe to good rkets in my country you,ll have more benifit. your Sincerely
on 1976.(genera INST)

ronny mcginn, e-mail, 12.11.2015reply

iam in training in a raf 2000 gyroplane, I seen this hawk 4 on the web, im sure interested in one of these, I believe it would be more beneficial for me on the ranch, I would love to talk to someone about this craft, thanks

Johan, e-mail, 13.10.2015reply

Hi. This qualified Flight Instructor would like to aquire all information on buying a Hawk4 Turbine driven Gyroplane from Groem Brothers (PayPal payment, Finance . . . etc. Please also email me all: service hour time, running cost per hour (service included), spares, shipping of a kit and spares, delivery time, availability . . . and all else. Waiting . . . Thanx!!!

KevinHsiung, e-mail, 30.04.2015reply

Dear Sir,
I would like to know about the price and the lead time of this aircraft. Thank you.

Luis Carlos Medeiros, e-mail, 07.04.2015reply

maquina espetacular

Flvio Cruz, e-mail, 29.08.2014reply

I would like to know the price of the aircraft, and how much time can be made ​​available, and are sold to other countries.

danial, e-mail, 19.10.2014reply

I would like to know the price of the aircraft, and how much time can be made ​​available, and are sold to other countries.

Tom, e-mail, 27.10.2014reply

Folks, why don't you put the answers to all the questions on your site. Tom I believe it will stop all the stupid questions that people call you about on the phone. Tom

Aero99, 24.06.2011reply

on youtube, the groen brothers aviation company has a youtube channel known as "Groen Aviation."

Marius, e-mail, 14.05.2014reply

I'm situated in South Africa. How can I acquire the hawk 4 and at what price? Thank you much

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