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Yakovlev Yak-LSh (Yak-25LSh) light "Shturmovik"

In accordance with the TTT of the Air Force, in KB Yakovlev worked out two options lung frontline attack aircraft. The first option provided for the creation of a fully new plane and engine, which would require at least five years for its construction, testing and mastering in mass production. The second option was carried out on the basis of located on armament interceptor fighter Yak-25 by altering the fuselage, installing related equipment and weapons and could be created within 5-6 months. Interceptor Yak-25 with two AM-5 turbojet engines of 2000 kg each, swept wing and bike chassis proved to be in operation as exclusively reliable, safe airplane, easy to pilot and available for quick development. The scheme bicycle landing gear excluded emergency during damage to the tires of the wheels of the chassis, the airframe had a large reserve, power installation provided operation aircraft at unpaved airfields, as engines were equipped with protection against foreign objects. As a result, the design bureau was given a priority for in-depth elaboration precisely on this option.

The main changes at the creation of an attack aircraft based on the Yak-25 consisted of the following:

• nasal part fuselage redone for providing view forward-down 20 degrees .;
• complex equipment interceptor was replaced by a complex ground attack equipment;
• all vital parts aircraft (cockpit, engines, part of the equipment) were booked;
• fuel tanks reliably practiced;
• at quality stationary weapons mounted two guns GSh-23 with an ammunition load of 400 shells and fuselage reactive unit shells ARS-57 or KARS-57 per 100pcs.,
• mounted under the wing six pylons for external suspension various weapons;
• ejection seat provided for the rescue of the pilot on all flight modes, including take-off and landing.

The battleload Yak-25LSh was normal - 1500 kg, maximum-3000kg Range bombing armament included bombs caliber 50, 100, 250 and 500 kg of all types. On six underwing pylons could accommodate up to four overhead containers with GSh-23 cannons and ammunition (by250 shells). Guided weapons included up to four missiles X-23 and R-ZS, uncontrolled six NAR S-24 and S-25. Interesting It was decision placement of the fuselage of a 100-projectile unit which was installed behind the main niche chassis and could go down for recharge or replacements equipped. The trunks of the block had shooting angle forward and downward at an angle of 45 degrees., i.e. start rockets at storming ground targets could be made in horizontal flight that in his turn raised small aircraft survival heights.

As the project progressed the plane underwent changes: the wing was moved from low to high position, and increased the wing area, mechanization was improved with purpose improvements take-off landing characteristics Yak-25LSH. The installation was being worked out more powerful engines RD-9F and AM-11.

By the end of December 1971 the initial view attack aircraft greatly transformed. Almost the only thing unchanged was the bike chassis scheme. The plane called Yak-LSh-2 had fuselage, extended by 500 mm, due to which the volume increased fuel. High on keel stabilizer moved to fuselage, its shape in plan and area increased. It was developed by all new upscale wing more square from deflectable socks and powerful mechanization. Wing sweep along the leading edge has become smaller and amounted to 35 degrees, instead of 45 degrees, in source option.

All this is significantly improved aerodynamics aircraft, increased its maneuverability, the opportunity to increase weight combat load. Was planned setting more perfect sighting equipment including laser rangefinder FON-1400. At consideration of projects LSS represented by the contestants generalized conclusion Air force offers CB CB. Ilyushin, A.I.Mikoyan and A.S. Yakovlev deviated. The winner was the project of Design Bureau P.O.Sukhoi is the future Su-25. But the work of the specialists of KB A.S.Yakovlev over the attack aircraft project is not was wasted. His qualities (true, already at a new technological level) possesses combat training aircraft Yak-130 ongoing state tests in GLIC them. V.P. Chkalov's application weapons and mass-produced for the Russian Air Force.