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driving a three blade propeller first flew on 12 July 2000. It was redesignated Hawk 4 when development of the piston engine version was dropped. It had a taller undercarriage, high set tailplane, endplate fins with rounded extensions below the tailbooms and modifications to the inboard rudders.
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piston engine, which provided pre-rotation power to the rotor for jump starts and drove a four blade propeller in forward flight. The Hawk 4 first flew on 29 September 1999 and had logged 120 hours by the following April. A second aircraft, initially designated
129:. The production prototype, a four-seater named the Hawk 4, was significantly different from the Hawk III in detail but retained the pod and mid-line pusher engine configuration, combined with low stub wings, twin booms and
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were shortened so that the tailplane no longer needed cut-outs for their movement and extra, short, inboard rudders were added. Successive engine changes increased the power by almost a factor of two.
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with mainwheels mounted at the tips of the stub wings. Two rows of seats accommodated the pilot and up to three passengers; alternatively, the rear seats could be folded to provide baggage space.
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built in the United States in the late 1990s. Three prototypes, two piston engined and one turboprop powered, were flown but the Hawk did not go into production.
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137:, aluminium rotor in place of the earlier tapered, composite blade. The rotor was also lowered and the pitch control levers enclosed within a shallower
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The Hawk 5 was a planned five seat development. Despite optimistic sales predictions before the 2000 recession, the Hawk did not reach production.
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contracted with GBA to provide aerial security over Salt Lake
International Airport. The Hawk 4 second prototype bearing the acronym
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The Hawk 4 had a steel rotor mast and engine mountings but was mostly aluminium elsewhere, including the rotor, rotor head and
133:. Changes between the Hawk III and 4, apart from cabin revisions to accommodate the extra seat, included a new constant
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Design work on the Hawk utility/passenger autogyro began in 1996 and the first prototype, the two seat
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165:. Some components, such as the nosecone, engine cowling and cabin door were formed from
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were cropped, so that they no longer extended beyond the booms and fins, the
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on the endplate fins and the all-moving inboard rudders. It had a fixed,
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4-bladed MTV, 6 ft 4 in (1.93 m) diameter constant speed
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499:“Olympic Security Aided by Groen Brother’s Hawk”, Aero-News Network
230:(Utah Olympic Public Safety Command) was used for this assignment.
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600 mi (965 km, 521 nmi) 75% power, maximum fuel
439:. Coulsdon, Surrey: Jane's Information Group. pp. 671–2.
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10 ft 0 in (3.05 m) to top or rotor head
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130 mph (209 km/h, 113 kn) at 75% power
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The Hawk 4 was powered by a 261 kW (350 hp)
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407:. London: Jane's Information Group. p. 650.
484:: CS1 maint: bot: original URL status unknown (
371:2.02 lb/sq ft (9.87 kg/m) maximum
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261:22 ft 0 in (6.71 m) fuselage
205:and powered by a 313 kW (420 hp)
466:. Archived from the original on 9 May 2012
405:Jane's All the World's Aircraft 1999-2000
347:150 mph (240 km/h, 130 kn)
332:140 mph (225 km/h, 121 kn)
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33:The turboprop powered second prototype.
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437:Jane's All the World's Aircraft 2000-01
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311:1,385.4 sq ft (128.71 m)
527:Hawk 4 Gyroplane Takeoffs and Landings
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241:Jane's All the World's Aircraft 2000/1
234:Specifications (Hawk 4, piston engine)
15:
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305:42 ft 0 in (12.80 m)
559:1990s United States civil aircraft
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299:piston, 350 hp (261 kW)
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365:1,500 ft/min (7.6 m/s)
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554:Single-engined pusher autogyros
181:was jointly controlled by the
177:, rotating at up to 270 rpm.
1:
359:15,994 ft (4,875 m)
279:2,800 lb (1,270 kg)
564:Aircraft first flown in 1997
285:284 L (75 US gal; 62 Im gal)
273:1,841 lb (835 kg)
173:or teetering design with a
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381:Landing from 15 m (50 ft):
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375:Take-off to 15 m (50 ft):
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141:. The wings and fixed
246:General characteristics
435:Jackson, Paul (2000).
403:Jackson, Paul (1999).
187:tricycle undercarriage
117:Design and development
75:4 February 1997 (H2X)
105:was a single engine,
303:Main rotor diameter:
293:Continental TSIO-550
224:Winter Olympic Games
194:Continental TSIO-550
107:pusher configuration
277:Max takeoff weight:
218:Operational history
169:. The rotor was a
167:composite materials
66:Skyworks Global Inc
569:Twin-boom aircraft
464:"Jane's - Groen 4"
343:Never exceed speed
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161:was an aluminium
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357:Service ceiling:
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309:Main rotor area:
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183:balanced rudders
94:Groen ShadowHawk
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46:Type of aircraft
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163:semi-monocoque
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109:, four seat
103:Groen Hawk 4
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81:Number built
470:25 December
323:Performance
315:Propellers:
295:air cooled
289:Powerplant:
196:air cooled
175:swash plate
543:Categories
390:References
171:semi-rigid
41:Four seat
239:Data from
211:turboprop
155:propeller
143:tailplane
90:Variants
480:cite web
297:flat-six
198:flat-six
159:fuselage
127:Hawk III
111:autogyro
43:autogyro
532:YouTube
265:Height:
259:Length:
203:Hawk 4T
147:rudders
139:fairing
19:Hawk 4
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351:Range:
209:-B17C
157:. The
253:Crew:
228:UOPSC
135:chord
38:Role
486:link
472:2011
441:ISBN
409:ISBN
291:1 Ă—
131:fins
101:The
530:on
179:Yaw
123:H2X
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482:}}
478:{{
455:^
423:^
85:3
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255:4
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