From Wikipedia, the free encyclopedia

Helio Courier
Type	Utility aircraft
Manufacturer	Helio Aircraft Company
Introduction	1954

The Helio Courier is a light C/STOL utility aircraft designed in 1949.

The aircraft was manufactured in Pittsburg, Kansas from 1954 until 1974 by the Helio Aircraft Company. During the early 1980s, new owners (Helio Aircraft Ltd.) made an attempt to build new aircraft with direct-drive Lycoming engines, to replace troublesome and expensive geared engines. In a further effort to reduce weight, a new composite landing gear was featured. The new models also featured modest winglets. Two models were produced, the H-800 and H-700. 18 aircraft were built and no Helios have been produced since.

Contents 1 Design 2 Operational history 3 Military operators 4 Specifications (U-10D Super Courier) 5 External links 6 Related content

The all-aluminum airframe features a welded 15G steel-tube roll cage, complete with shoulder harnesses that protect the occupants in an emergency. The wings are of conventional aluminum construction, but feature Handley-Page leading-edge slats that deploy automatically when the aircraft's airspeed falls below a certain value (55-60 mph). The slats contribute to the Helio's outstanding short takeoff and landing (STOL) capability, and allow for stall/spin-proof controllable flight, in conjunction with the leading-edge slats, 74% of the trailing edge incorporates high lift slotted flaps, together with interceptor blades atop each wing when roll control is lost a very low airspeed, allows for turn radius within the wingspan of the airplane.

The design of the Helio features a large vertical surface and rudder for control at very low flight speeds, however, on conventional geared aircraft (taildraggers), the airplane tends to be cross-wind sensitive, thus a cross-wind gear option is available allowing the main tires to caster left or right 20 degrees, increasing the cross-wind component to 25 mph. The Helio has its main gear placement far forward of the cabin enabling hard braking on unprepared landing areas. A tri-gear model was produced, but is unsuitable for unprepared rough terrain.

Helios are also capable of being float equipped, both straight and amphibious floats being offered.

With a minimum-control speed of around 28 mph, the Courier is perfectly suited for confined off-airport operations. The first one was certified in July 1954 and powered by the Lycoming GO-435-C2B2 (260 hp).

In 1957 a "Strato Courier" set an altitude record over Mexico City, Mexico at 31,200 ft. powered by a geared Lycoming GSO-480 (340 hp), only one was built. The Super Courier, a more powerful derivative, was used by the US Air Force from 1958 onward, and by Air America during the Vietnam War as the U-10. In USAF service, the U-10 Super Courier was used for liaison work, light cargo and supply drops, psychological warfare, forward air control, and reconnaissance. Various versions were produced up through the 1980s, including turbine-powered variants. Some are still in use today as bush planes and light transports.

The Helio AU-24A was the gunship version of the H550A Stallion, with a PT6A-27 680 shp turboprop, equipped with a General Electric XM-197 three-barrel 20 mm Gatling gun was mounted in the left cargo door. It also had five underwing and fuselage hardpoints. Of the 17 aircraft built, fourteen or fifteen were sold to the Cambodian (Khmer) Air Force. The Helio Stallion was also built as U-10 Super Courier (ex L-28). Over 120 were built: L-28A (2, later redesignated U-10A), U-10A (26), U-10B extended range and paratrooper doors (57), U-10D heavier (36), but no U-10C.

It is thought that about 200 Helio Couriers are active today. Helios are very popular amongst bush pilots in Canada and Alaska and missionaries who fly into rough, relatively unprepared jungle airstrips because of its superior STOL abilities.

Some operators use the Helio Couriers for aerial observation. Both Winged Vision Inc. of Gaithersburg, Maryland and the Pima County, Arizona, Sheriff's Department operate the rare tri-gear model and mount gyro-stabilized cameras under the wing for aerial observation. Pima County mounts a FLIR camera for law enforcement, and Winged Vision mounts a high definition television camera for coverage of major sports events. They include Monday Night Football, the 2002 Winter Olympics in Salt Lake and other major sports events.

•  Peru
•  Thailand
  • Royal Thai Air Force
•  United States
  • US Air Force

General characteristics

• Crew: one, pilot
• Capacity: 5 passengers
• Length: 30 ft 8 in (9.35 m)
• Wingspan: 39 ft 0 in (11.89 m)
• Height: 8 ft 10 in (2.69 m)
• Loaded weight: 3,400 lb civilian, 3,600 lb. military (1,545 kg, 1,636 kg)
• Useful load: 1,320 lb (600 kg)
• Powerplant: 1× Lycoming GO-480-G1D6 geared 6-cylinder engine, 295 hp (220 kW)

Performance

• Maximum speed: 148 knots (170 mph, 288 km/h)
• Range: 950 nm (120 gal. fuel) (1,380 miles, 1,760 km)
• Service ceiling: 20,500 ft (6,250 m)
• Rate of climb: 1,200 ft/min (6.1 m/s)

• Helio Aircraft homepage
• USAF Museum
• Modern aerial photography Courier operator
• HelioCourier.Net

Related development

Helio Twin Courier

Comparable aircraft

• Fieseler Fi 156
• Murphy Moose
• Max Holste MH-1521 Broussard
• Maule M-5
• De Havilland Canada DHC-2 Beaver

Designation sequence

Pre-1962

L-20 - L-21 - L-23 - L-24 - L-25 - L-26 - L-27 - L-28

Post-1962

U-7 - U-8 - U-9 - U-10 - U-11 - U-16 - U-17

v • d • e Lists relating to aviation
General	Timeline of aviation · Aircraft · Aircraft manufacturers · Aircraft engines · Aircraft engine manufacturers · Airports · Airlines
Military	Air forces · Aircraft weapons · Missiles · Unmanned aerial vehicles (UAVs) · Experimental aircraft
Notable incidents and accidents	Military aviation · Airliners · General aviation · Famous aviation-related deaths
Records	Flight airspeed record · Flight distance record · Flight altitude record · Flight endurance record · Most produced aircraft