A short takeoff and landing (STOL)

aircraft An aircraft ( aircraft) is a vehicle that is able to flight, fly by gaining support from the Atmosphere of Earth, air. It counters the force of gravity by using either Buoyancy, static lift or the Lift (force), dynamic lift of an airfoil, or, i ...

is a

fixed-wing aircraft A fixed-wing aircraft is a heavier-than-air aircraft, such as an airplane, which is capable of flight using aerodynamic lift. Fixed-wing aircraft are distinct from rotary-wing aircraft (in which a rotor mounted on a spinning shaft generate ...

that can takeoff/land on short

runway In aviation, a runway is an elongated, rectangular surface designed for the landing and takeoff of an aircraft. Runways may be a human-made surface (often asphalt concrete, asphalt, concrete, or a mixture of both) or a natural surface (sod, ...

s. Many STOL-designed aircraft can operate on

airstrip An aerodrome, airfield, or airstrip is a location from which aircraft flight operations take place, regardless of whether they involve air cargo, passengers, or neither, and regardless of whether it is for public or private use. Aerodromes in ...

s with harsh conditions (such as

high altitude Altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The exact definition and reference datum varies according to the context (e.g., aviation, geometry, geographical s ...

or ice). STOL aircraft, including those used in scheduled passenger airline operations, can be operated from

STOLport A STOLport or STOLPORT was an airport designed with STOL (Short Take-Off and Landing) operations in mind, usually for an aircraft class of a certain weight and size. The term "STOLport" did not appear to be in common usage as of 2008, although wa ...

airfields that feature short runways.

Design

STOL aircraft come in configurations such as bush planes,

autogyro An autogyro (from Greek and , "self-turning"), gyroscope, gyrocopter or gyroplane, is a class of rotorcraft that uses an unpowered rotor in free autorotation to develop lift. A gyroplane "means a rotorcraft whose rotors are not engine-d ...

s, and taildraggers, and those such as the de Havilland Canada Dash-7 that are designed for use on conventional airstrips. The

PAC P-750 XSTOL The PAC P-750 XSTOL, (formerly known as the PAC 750XL) is a utility aircraft of conventional all-metal low-wing monoplane design, with fixed tricycle undercarriage. Combining the engine and wings of the PAC Cresco with a new larger fuselage a ...

, the Daher Kodiak, the

de Havilland Canada DHC-6 Twin Otter The de Havilland Canada DHC-6 Twin Otter is a Canadian STOL (Short Takeoff and Landing) utility aircraft developed by de Havilland Canada in the mid-1960s and still in production today. Built by De Havilland Canada from 1965 to 1988, Viking ...

and the Wren 460 have STOL capability, needing a short ground roll to get airborne, but are capable of a near-zero ground roll when landing. YA2F-1 tilting pipes NAN6-60

For any plane, the required

length is a function of the square of the

stall speed In fluid dynamics, a stall is a reduction in the lift coefficient generated by a foil as angle of attack exceeds its critical value.Crane, Dale: ''Dictionary of Aeronautical Terms, third edition'', p. 486. Aviation Supplies & Academics, 1997. ...

(minimum flying speed), and much design effort is spent on minimizing this number. For

takeoff Takeoff is the phase of flight in which an aerospace vehicle leaves the ground and becomes airborne. For aircraft traveling vertically, this is known as liftoff. For aircraft that take off horizontally, this usually involves starting with a tr ...

, large power/weight ratios and low drag help the plane to accelerate for flight. For landing, the length is minimized by strong

brake A brake is a machine, mechanical device that inhibits motion by absorbing energy from a moving system. It is used for Acceleration, slowing or stopping a moving vehicle, wheel, axle, or to prevent its motion, most often accomplished by means of ...

s, low landing speed, and

thrust reverser Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's thrust for it to act against the forward travel of the aircraft, providing deceleration. Thrust reverser systems are featured on many jet aircraft to ...

s or

spoiler Spoiler or Spoilers may refer to: Arts, entertainment and media * Spoiler (media), something that reveals significant plot elements * The Spoiler, DC Comics superheroine Stephanie Brown Film and television * ''Spoiler'' (film), 1998 American ...

s. Overall STOL performance is set by the longer of the runway needed to land or take off. Of equal importance to runway length is the ability to clear obstacles, such as hills, beyond the runway. For takeoff, large power/weight ratios and low drag increase the rate of climb – required to clear obstacles. For landing, high drag allows the plane to descend steeply without building speed, which would require a longer ground run. Drag is increased by use of flaps on the wings and by forward slip (causing the plane to fly somewhat sideways to increase drag). Typically, a STOL aircraft has a large

wing A wing is a type of fin that produces both Lift (force), lift and drag while moving through air. Wings are defined by two shape characteristics, an airfoil section and a planform (aeronautics), planform. Wing efficiency is expressed as lift-to-d ...

for its weight. These wings may use

aerodynamic Aerodynamics () is the study of the motion of atmosphere of Earth, air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dynamics and its subfield of gas dynamics, and is an ...

devices like flaps, slots, slats, and

vortex generator A vortex generator (VG) is an aerodynamic device, consisting of a small wikt:vane, vane usually attached to a lifting surface (or airfoil, such as an aircraft, aircraft wing) or a rotor blade of a wind turbine. Typically, achieving excellent STOL performance reduces maximum speed, but not payload ability. The payload is critical, because many small, isolated communities rely on STOL aircraft as their only link to the outside world for passengers or cargo; examples include many communities in the Canadian north and

Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...

. Most STOL aircraft can

land Land, also known as dry land, ground, or earth, is the solid terrestrial surface of Earth not submerged by the ocean or another body of water. It makes up 29.2% of Earth's surface and includes all continents and islands. Earth's land sur ...

either on- or off-airport. Typical off-airport landing areas include snow or ice (using skis), fields or gravel riverbanks (often using special fat, low-pressure tundra tires), and water (using floats): these areas are often short and obstructed by trees or hills. Wheel skis and amphibious floats combine wheels with skis or floats, allowing landing on snow/water.

Kits

A number of aircraft modification companies offer STOL kits for improving short-field performance. * Crosswinds STOL of

Wasilla, Alaska Wasilla (Denaʼina language, Dena'ina: ''Benteh'') is a city in Matanuska-Susitna Borough, Alaska, United States, and the List of cities in Alaska, fourth-largest city in Alaska. It is located on the northern point of Cook Inlet in the Matanus ...

, sells STOL kits for light aircraft, including

leading edge cuff A leading-edge cuff is a fixed aerodynamics, aerodynamic wing device employed on fixed-wing aircraft to improve the Stall (flight), stall and spin (aerodynamics), spin characteristics. Cuffs may be either factory-designed or an after-market add- ...

s, tip spill plates, inboard flap extensions and STOL fences. The company offers kits for Piper PA-12, PA-14, PA-18, PA-20 and 22, Bellanca Champion Model 7 series, Cessna 170B, 180 and 185. * Horton, Inc, of Wellington, Kansas, offers STOL kits under the brand name ''Horton STOL-Craft'', emphasizing that the modifications increase safety by allowing forced landings to occur at lower speeds and thus improve survivability. The Horton modifications include a drooped

, conical cambered wingtips, control surface gap seals and

wing fence A wing is a type of fin that produces both lift and drag while moving through air. Wings are defined by two shape characteristics, an airfoil section and a planform. Wing efficiency is expressed as lift-to-drag ratio, which compares the bene ...

s. The company says: "On an average you can expect to get a 4-7 knot reduction in stall speeds. Flying at these lower stall speeds you can reduce the take-off and landing distances by 10%". Horton STOL kits are available for several

Cessna Cessna () is an American brand of general aviation aircraft owned by Textron Aviation since 2014, headquartered in Wichita, Kansas. Originally, it was a brand of the Cessna Aircraft Company, an American general aviation aircraft manufactu ...

and Piper PA-28 models. * Micro AeroDynamics markets

vortex generator A vortex generator (VG) is an aerodynamic device, consisting of a small wikt:vane, vane usually attached to a lifting surface (or airfoil, such as an aircraft, aircraft wing) or a rotor blade of a wind turbine.elevator An elevator (American English) or lift (Commonwealth English) is a machine that vertically transports people or freight between levels. They are typically powered by electric motors that drive traction cables and counterweight systems suc ...

and on the fin. Kits are available for a large number of light aircraft types. * Sierra Industries sells Robertson STOL kits, marketed under the name R/STOL, incorporate a drooped leading edge cuff, wing fences, drooping ailerons and an automatic trim system. The company says that installation "allows 15 to 25 MPH slower approaches and requires up to 40% less runway distance". R/STOL kits are available for various Cessna models. * Stolairus Aviation of Kelowna, British Columbia, has developed STOL Kits for the de Havilland Canada DHC-2 Beaver and

de Havilland Canada DHC-3 Otter The de Havilland Canada DHC-3 Otter is a single-engined, high-wing, Propeller (aircraft), propeller-driven, short take-off and landing (STOL) aircraft developed by de Havilland Canada. It was conceived to be capable of performing the same role ...

to increase lift and reduce stall speeds. The DHC-2 Beaver STOL Kit includes a contoured leading edge, flap-gap seals, wing fences and drooped wingtips. The DHC-3 Otter STOL Kit includes a contoured leading edge and drooped wingtips.

STOLport

CESTOL

Cruise-efficient short takeoff and landing (CESTOL) have very short runway requirements and cruise speeds greater than

Mach The Mach number (M or Ma), often only Mach, (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a Boundary (thermodynamic), boundary to the local speed of sound. It is named after the Austrian physi ...

0.8.

Definitions

Many definitions of STOL have been used over time and for regulatory and military purposes. These include: Some manufacturers market their products as STOL without specifying that the aircraft meets an accepted functional definition.

Rough-field capability

Rough-field capability is the ability to land/take-off from an unprepared/damaged runway or grass field, highway, wasteland or other ad hoc site. Rough-field capable aircraft usually have high wings, reinforced landing gear, and STOL capability.

List of rough-field capable aircraft

* AHRLAC Holdings Ahrlac *

Airbus A400M The Airbus A400M AtlasNamed after the Atlas (mythology), Greek mythological figure. is a European four-engine turboprop military transport aircraft. It was designed by Airbus Military, now Airbus Defence and Space, as a tactical airlifter with ...

* Arado Ar 232 Tausendfüßler * British Aerospace 125 * Cessna A-37 Dragonfly *

Cessna Caravan The Cessna 208 Caravan is a utility aircraft produced by Cessna. The project was commenced on November 20, 1981, and the prototype first flew on December 9, 1982. The production model was certified by the FAA in October 1984 and its Cargoma ...

* General Atomics Mojave *

General Dynamics F-111 Aardvark The General Dynamics F-111 Aardvark is a retired supersonic, medium-range, multirole combat aircraft. Production models of the F-111 had roles that included attack (e.g. interdiction), strategic bombing (including nuclear weapons capabiliti ...

* Pilatus PC-24 * SEPECAT Jaguar *

Sukhoi Su-7 The Sukhoi Su-7 ( NATO designation name: Fitter-A) is a swept wing, supersonic fighter aircraft developed by the Soviet Union in 1955. Originally, it was designed as a tactical, low-level dogfighter, but was not successful in this role. On the ...

* Tupolev Tu-142

References

External links

*
Anatomy of a STOL Aircraft: Designing a Modern Short Take-Off and Landing Aircraft by Chris Heintz
* {{Types of take-off and landing Types of take-off and landing