|
Letov LK-2 Sluka is a Czech single-seat high-wing ultralight aircraft produced by the Letov aircraft factory in 1990s and later as a kitbuilt or custom production using tools and material which remained after the closing of the factory production. Sluka is a simple, cheap and easy to fly aircraft which contributed to a rapid growth of ultralight flying organized by then established Light Aircraft Association (LAA - Letecká amatérská asociace) in the Czech Republic. Its main purpose is a local hobby flying and a flight training as a complement to twin seat elementary trainers like Letov LK-3 and ST-4 or TL-32 Typhoon. Sluka does not offer any advanced training possibilities in respect of performance, speed, ceiling or aerobatics compared to the mentioned twin seat models but its purchase price and cost per flight hour are lower. In 2010s it is usually operated by private owners and enthusiasts as it never was widely used in aero clubs which preferred modern composite or metal designs with better performance and fuel economy usually powered by the 4-stroke Rotax 912. ==Design and development== The design is common to many other low-cost aircraft, aluminium alloy tube strut-based construction fixed to the central fuselage tube, high wing with pre-sewn fabric envelop with life-span of 5–10 years. Cabin nacelle with open or closed (upgraded M model) windshield is fixed below the tube, tricycle landing gear is suspended with elastic ropes or the main gear is fixed on a composite spring leg for the M model. Front wheel is steered with a rudder and is equipped with a simple brake and a handle on the stick. Flight controls are standard 3-axis with flight stick, rudder and a throttle on the left side of the cabin. Standard 25 litre fuel tank is placed behind the pilot seat and gives about 2 hours of flight time. It was usually replaced with a bigger one of 50 litre capacity. Composite 50 litre tank is used on later models. Popular two-stroke, two-valve, air-cooled Rotax engines type 447, 503 or 582 are used with 447 attached to the Rotax "B-type" gearbox being the factory standard. Engine is fixed in front of the fuselage tube. Two or three-bladed propellers are used given the engine type and owner's requirements. Default engine installation is recoil-started with the handle in the reach of the pilot (above head for the open cabin or pulley below the instrument panel for the closed cabin. There is only one switch for magneto cut-off in standard but it is widely customized with integrated alternate current generator and battery to enable power for electric instruments (radio, GPS), beacons and Rotax electric engine starter making the aircraft more comfortable. Instruments are usually a basic set given the size of the panel. It consists of variometer, altimeter, speed indicator in the top line and two smaller engine instruments below (revolution counter and valve head temperature indicator). Custom upgrades can be of different kind usually providing communication radios, different GPS devices, integrated engine instruments, Hobbs meter, ELT or turn indicators. Sluka is easy to fly aircraft requiring only basic skills to handle. Operating envelope enables flying in range of 45–100 km/h speeds with 60 km/h as a best climb and descend speed and 70 km/h for every nonstandard procedure like engine failure. It is very stable in flight and does not require continuous pilot's attention to controls. Spins are not allowed for ultralight aircraft but it is also almost impossible to enter it in Sluka due its stability. Flight control surfaces are effective in every situation. Maintenance is also easy as there is almost no cowling, engine and fuel installation can be easily inspected and steel wire controls are mounted on the main fuselage tube. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Letov LK-2 Sluka」の詳細全文を読む スポンサード リンク
|