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Su-25K

Sukhoi Su-25K (1988)

THIS CRAFT CONTAINS MODS! It utilizes the "Wings" mod for aerodynamics surfaces, everything else is stock.

(Russian: Grach (rook); NATO reporting name: Frogfoot)

The Sukhoi Su-25 is a subsonic, single-seat, twin-engine jet aircraft developed in the Soviet Union by Sukhoi. It was designed to provide close air support for Soviet Ground Forces. The first prototype made its maiden flight on 22 February 1975. After testing, the aircraft went into series production in 1978 in Tbilisi in the Georgian Soviet Socialist Republic. Since entering service more than 41 years ago, the Su-25 has seen combat in several conflicts. The type was heavily involved in the Soviet–Afghan War, flying counter-insurgency missions against the Afghan Mujahideen.

The Su-25 has a conventional aerodynamic layout with a shoulder-mounted trapezoidal wing and a traditional tailplane and rudder. All versions of the Su-25 have a metal cantilever wing, of moderate sweep, high aspect ratio and equipped with high-lift devices. The wing consists of two cantilever sections attached to a central torsion box, forming a single unit with the fuselage. The air brakes are housed in fairings at the tip of each wing. Each wing has five hardpoints for weapons carriage, with the attachment points mounted on load-bearing ribs and spars. Each wing also features a five-section leading edge slat, a two-section flap and an aileron. The flaps are mounted by steel sliders and rollers, attached to brackets on the rear spar. The trapezoidal ailerons are near the wingtips. The fuselage of the Su-25 has an ellipsoidal section and is of semi-monocoque, stressed-skin construction, arranged as a longitudinal load-bearing framework of longerons, beams and stringers, with a transverse load-bearing assembly of frames. The one-piece horizontal tailplane is attached to the load-bearing frame at two mounting points.

Early versions of the Su-25 were equipped with two R-95Sh non-afterburning turbojets, in compartments on either side of the rear fuselage. The engines, sub-assemblies and surrounding fuselage are cooled by air provided by the cold air intakes on top of the engine nacelles. A drainage system collects oil, hydraulic fluid residues and fuel from the engines after flight or after an unsuccessful start. The engine control systems allows independent operation of each engine. The latest versions (Su-25T and TM) are equipped with improved R-195 engines. The autocannon is in a compartment beneath the cockpit, mounted on a load-bearing beam attached to the cockpit floor and the forward fuselage support structure. The nose is fitted with distinctive twin pitot probes and hinges up for service access. The pilot flies the aircraft by means of a centre stick and left hand throttles. The pilot sits on a Zvezda K-36 ejection seat (similar to the Sukhoi Su-27) and has standard flight instruments. At the rear of the cockpit is a six-millimetre-thick (0.24 in) steel headrest, mounted on the rear bulkhead. The cockpit has a bathtub-shaped armoured enclosure of welded titanium sheets, with transit ports in the walls. Guide rails for the ejection seat are mounted on the rear wall of the cockpit. The canopy hinges open to the right and the pilot enters using the flip-down ladder. Once inside, the pilot sits low in the cockpit, protected by the bathtub assembly, which makes for a cramped cockpit. Visibility from the cockpit is limited, being a trade-off for improved pilot protection. Rearwards visibility is poor and a periscope is fitted on top of the canopy to compensate. A folding ladder built into the left fuselage provides access to the cockpit as well as to the top of the aircraft. The base model Su-25 incorporates a number of key avionics systems. It has no TV guidance but includes a distinctive nose-mounted laser rangefinder, that is thought to provide for laser-based target finding. A DISS-7 doppler radar is used for navigation; the Su-25 can fly at night, in visual and instrument meteorological conditions. The Su-25 often has radios installed for air-to-ground and air-to-air communications, including an SO-69 identification-friend-or-foe (IFF) transponder. The aircraft's self-defence suite includes various measures, such as flare and chaff dispensers capable of launching up to 250 flares and dipole chaff. Hostile radar uses are guarded against via an SPO-15 radar warning receiver. An airtight avionics compartment is behind the cockpit and in front of the forward fuel tank.

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