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Information about Aero L-39 ALBATROS.



The Aero L-39 Albatros is a high-performance jet trainer developed in Czechoslovakia by Aero Vodochody. It was designed during the 1960s as a replacement for the Aero L-29 Delfín as a principal training aircraft. The L-39 Albatros has the distinction of being the first of the second-generation jet trainers to be produced, as well as being the first trainer aircraft to be equipped with a turbofan powerplant. The type was exported to a wide range of countries as a military trainer.

The L-39 Albatros later served as the basis for the updated L-59 Super Albatros, as well as the L-139 (prototype L-39 with Garrett TFE731 engine). A further development of the design, designated as the L-159 ALCA, entered production in 1997. To date, more than 2,800 L-39s have served with over 30 air forces around the world. The Albatros is the most widely used jet trainer in the world; in addition to performing basic and advanced pilot training, it has also flown combat missions in a light-attack role. The design never received a NATO reporting name.

At the Farnborough Airshow in July 2014, Aero Vodochody announced the launch of the L-39NG, an upgraded and modernised version of the L-39.

Design of Aero L-39 ALBATROS.



The L-39 Albatros was designed to be a cost-effective jet-powered trainer aircraft, which is also capable of performing ground attack missions. For operational flexibility, simplicity, and affordability, the majority of onboard systems have been simplified to avoid incurring high levels of maintenance, as well as to minimize damage caused by mishandling when flown by inexperienced air crew. It could be readily flown from austere airstrips such as frozen lakebeds, enabled through the rugged design of the landing gear and favourable low landing speeds.

The aircraft's flying qualities are reportedly simple, which is made easier by way of a rapid throttle response, making it easier for students who had never previously flown before to successfully control. As a training platform, the L-39 itself comprised part of a comprehensive system which also used flight simulators and mobile ground test equipment.

The low-set, straight wing has a double-taper planform, 2½-deg dihedral from the roots, a relatively low aspect ratio, and 100 litres (26 US gal; 22 imp gal) fuel tanks permanently attached to the wingtips. The trailing edge has double-slotted trailing edge flaps inboard of mass-balanced ailerons; the flaps are separated from the ailerons by small wing fences. An automatic trimming system was present, the flaps and the trim system being connected in order to counteract the potentially large pitch changes that would otherwise be generated by vigorous movements of the flaps.

The tall, swept vertical tail has an inset rudder. Variable-incidence horizontal stabilizers with inset elevators are mounted at the base of the rudder and over the exhaust nozzle. Side-by-side airbrakes are located under the fuselage ahead of the wing's leading edge. The flaps, landing gear, wheel brakes and air brakes are powered by a hydraulic system. Controls are pushrod-actuated and have electrically powered servo tabs on the ailerons and rudder. Operational g-force limits at 4,200 kilograms (9,300 lb) are +8/-4 g.

A long, pointed nose leads back to the tandem cockpit, in which the student and instructor sit on Czech-built VS-1 ejection seats under individual canopies, which are opened manually and are hinged on the right. The rear seat, typically used by the instructor, is elevated slightly to readily enable observation and guidance of the student's actions in the forward position.

The design of the cockpit, panel layout and many of its fittings resemble or are identical in function to those of other commonly-used Soviet aircraft, such as the procedure for deploying the ejection seat being exactly the same as that used upon the Mikoyan MiG-29. The cockpit is highly pressurized, requiring the air crew to wear oxygen masks only when flying in excess of 23,000 feet.

A gyro gun sight for weapon-aiming purposes is typically present in the forward position only.
A single turbofan engine, an Ivchenko AI-25TL (made in the Soviet Union) is positioned in the rear fuselage, fed through shoulder-mounted, semi-circular air intakes (fitted with splitter plates) just behind the cockpit and the tailpipe below the horizontal tailplane.

The engine has a time between overhauls (TBO) of 1,000 flight hours, however, it is allegedly cheaper than the majority of turbine engines to overhaul. Five rubber bag fuel tanks are located in the fuselage behind the cockpit. Several heavy radio units are typically installed in an aft avionics bay, these are often removed on civilian-operated aircraft and replaced with a 70-gallon fuel tank instead. Additional fuel tanks can be fitted in the rear cockpit position and externally underneath the wings, the tip-tanks can also be expanded for a greater fuel capacity.

The aircraft is fitted with a hydraulically-actuated retractable nosewheel undercarriage which is designed to allow operation from grass airfields. The main landing gear legs retract inward into wing bays while the nose gear retracts forward.

The basic L-39C trainer has provision for two underwing pylons for drop tanks or practice weapons, but these are not usually fitted. It can be armed with a pair of K-13 missiles to provide a basic air defense capability. Light-attack variants have four underwing hardpoints for ground attack stores, while the ZA variant also has an underfuselage gun pod. Mock UB-16 rocket pods can also be installed for visual appearance only.


Source: https://en.wikipedia.org/wiki/Aero_L-39_Albatros

More about of Aero L-39NG.



L-39NG is a project of new, highly efficient trainer and light attack aircraft, able to serve as basic, advanced and LIFT trainer thanks to advanced avionics. L-39NG is based on aero dynamical concept of current L-39, but is manufactured with the use of new technologies and contents modern systems. L-39NG aircraft offers unprecedented efficiency along with minimal maintenance. L-39NG is a modern trainer aircraft with a low acquisition price and improved flight characteristics while keeping up its tradition of simple maintenance.

Aero develops a brand new L-39NG aircraft, which combines the proven aerodynamic concept with the most advanced manufacturing technologies and systems, which guarantee a long service life, highly efficient operating parameters, low investment and operating costs and wide utilization within air forces.
First L-39NG aircraft will be delivered to customers in 2019.

Aero wants to offer current users of L-39 an option to extend the life of the aircraft and modernizing it by the installation of a new engine and optionally also new avionics. In 2015, Aero successfully installed Williams FJ-44M engine and avionics built around Genesys Aerosystems’ multi-functional displays and head-up displays (HUD) by SPEEL Praha into existing L-39 aircraft. In September 2015, the demonstrator of re-engined L-39 successfully completed its first flight.

Source: http://www.aero.cz/en/products-services/programs/l-39ng-aircraft/

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