The Chaika L-4 (чайка, en, Seagull) is a twin engine

amphibious aircraft An amphibious aircraft or amphibian is an aircraft (typically fixed-wing) that can take off and land on both solid ground and water, though amphibious helicopters do exist as well. Fixed-wing amphibious aircraft are seaplanes ( flying boats ...

, designed and built in Russia in the 2000s. It has sold in small numbers and remains in production.

Design and development

Several companies and groups have developed a series of designs which began at an offshoot of the Trod

Kuznetsov Kuznetsov, Kuznyetsov, Kuznetsoff, or Kouznetsov (masculine, russian: Кузнецов) or Kuznetsova (feminine, russian: Кузнецова) is the third most common Russian surname, an equivalent of the English "Smith" (derived from a Russian word ...

aircraft engine plant in

Samara Samara ( rus, Сама́ра, p=sɐˈmarə), known from 1935 to 1991 as Kuybyshev (; ), is the largest city and administrative centre of Samara Oblast. The city is located at the confluence of the Volga and the Samara (Volga), Samara rivers, with ...

. Beginning with the L-3, they differ in size and engine type but all are twin engine amphibians with a characteristic V tail. The L-4 is a direct development of the L-6M, promoted by AeroVolga. Its design began in August 2004. All L-4 variants have the same layout and all are largely built of

composite material A composite material (also called a composition material or shortened to composite, which is the common name) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or ...

s. They are high-wing monoplanes with twin engines mounted close to the

fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...

, on top of the wing. The wings have straight taper on both edges and almost square tips. The L-4 has a pair of flaps on each wing. Its hull has two steps and there are small winglets at waterlevel just aft of the trailing edge. The cabin extends from below the

leading edge The leading edge of an airfoil surface such as a wing is its foremost edge and is therefore the part which first meets the oncoming air.Crane, Dale: ''Dictionary of Aeronautical Terms, third edition'', page 305. Aviation Supplies & Academics, ...

rearwards to the winglets. Fixed floats under the wings stabilize the L-4 on water; it is operable with waves to 400 mm (15 in) high. The most unusual feature of the L-4 is the

empennage The empennage ( or ), also known as the tail or tail assembly, is a structure at the rear of an aircraft that provides stability during flight, in a way similar to the feathers on an arrow.Crane, Dale: ''Dictionary of Aeronautical Terms, third ed ...

arrangement: it has twin

fin A fin is a thin component or appendage attached to a larger body or structure. Fins typically function as foils that produce lift or thrust, or provide the ability to steer or stabilize motion while traveling in water, air, or other fluids. Fin ...

s, mounted on the fuselage and extended forward with long, curved dorsal fillets, separated at the base by the full fuselage width and leaning slightly outwards. The fins carry conventional

rudder A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other vehicle that moves through a fluid medium (generally aircraft, air or watercraft, water). On an aircraft the rudder is used primarily to ...

s and the single

tailplane A tailplane, also known as a horizontal stabiliser, is a small lifting surface located on the tail (empennage) behind the main lifting surfaces of a fixed-wing aircraft as well as other non-fixed-wing aircraft such as helicopters and gyroplane ...

is mounted upon the fin tips, extending well beyond them. Tailplane and single piece

elevator An elevator or lift is a wire rope, cable-assisted, hydraulic cylinder-assisted, or roller-track assisted machine that vertically transports people or freight between floors, levels, or deck (building), decks of a building, watercraft, ...

together are trapezoidal; there is a trim tab at the centre of the elevator. The reason for the design is that the spine serves as a walkway to access the plane from behind, when moored at shore. The L-4 has a

conventional undercarriage Conventional landing gear, or tailwheel-type landing gear, is an aircraft undercarriage consisting of two main wheels forward of the center of gravity and a small wheel or skid to support the tail.Crane, Dale: ''Dictionary of Aeronautical Term ...

for land use, all three wheels and the

water rudder A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other vehicle that moves through a fluid medium (generally air or water). On an aircraft the rudder is used primarily to counter adverse yaw ...

being retractable. The first flight of the L-4 was in June 2005. The most recent variant, the more powerful L-44 flew in 2009.

Operational history

By mid-2008 sales, probably including L-6s from AeroVolga, had reached 14.

Variants

;L-4: Original design, no longer produced. ;L-42: Improved, with

Rotax 912 The Rotax 912 is a horizontally-opposed four-cylinder, naturally aspirated, four-stroke aircraft engine with a reduction gearbox. It features liquid-cooled cylinder heads and air-cooled cylinders. Originally equipped with carburetors, late ...

ULS flat four 73.3 kW (98.6 hp) engines. ;L-42M: Further improvements: weight savings, winglets, crew ergonomics. Marketed by Aviatech1.com. ;L-44: More powerful Rotax 914 engines, as detailed below. First flown 2009.

Specifications (Chaika L-44)

References

External links

* {{Official website, http://www.aviakb.ru/product/index_eng.html Amphibious aircraft 2000s Russian aircraft