|Yak-18T (1999 example)|
Soviet Air Force
The Yakovlev Yak-18T is a four or five seat fully aerobatic utility aircraft. Introduced to train Aeroflot pilots, it has gained some popularity as a sportplane both inside and outside the former USSR. It is powered by a 268-298 kW (360-400 hp) Vedeneyev M14P radial engine, and is designed for stresses of +6.48/-3.24 g.
Design and development
All the Yak-18 and Yak-18T have in common is the model number, the Yak-18T is a unique design, despite its nomenclature.
The 18T was designed in the late 60's, as a civilian aircraft. The aircraft has a nosewheel, is a 4 (or 5) seater, and has a 9-cylinder 360 hp radial. The Yak-18T shares systems with the Yak-50/52 family. These aircraft all have the 265 kW (355 hp) Vedneyev M14 nine cylinder radial engine as well as the same underlying compressed-air system for engine starting, brakes, undercarriage and flaps. The propeller, avionics and other parts are also shared. The Yak-18T, like all Russian aircraft used for training, is aerobatic.
Compared with other four-seat light aircraft such as the Cessna 172 or the Piper PA-28, the Yak-18T is only a little wider and longer but it is much heavier and is equipped with a considerably more powerful engine. The Yak-18T is perhaps better compared with the Piper Saratoga which has two extra seats but which has a similar maximum weight, together with a retractable undercarriage and a similarly powerful engine. The Yak-18T is, however, distinguished by its strong construction, aerobatic capability and docile yet responsive handling characteristics.
The Yak-18T prototype had its first flight in mid-1967 and subsequently the type was placed in series production in Smolensk.
The Yak-18T went on to become the standard basic trainer with Aeroflot flight schools, while small numbers also entered service with the Soviet Air Force as liaison and communications aircraft. After approximately 700 were built, many for Aeroflot, production ceased in the late 1980s, to be resumed in 1993. In 2011 it was claimed that the type remained in small scale production by the Yakolev Design Bureau, although apparently none had been produced in more than a decade.
Technoavia has marketed the SM94, its own development of the Yak-18T featuring curved front glass, larger capacity fuel tanks and choice of avionics package, but production is dependent on orders being placed.
- Cuban Air Force - Former operator.
- Moldova Air Force - one aircraft in active service for basic training
Standard a/c i.e. with 360hp M14P engine
- Crew: one, or two, student and instructor
- Capacity: max 5 occupants, 2 or 3 in the back but subject to CoG limitations
- Length: 8.39 m (27 ft 6 in)
- Wingspan: 11.16 m (36 ft 7½ in)
- Height: 3.40 m (11 ft 2 in)
- Wing area: 18.8 m² (202.36 ft²)
- Airfoil: Clark YH
- Aspect ratio: 6.62:1
- Empty weight: 1,217 kg (2,683 lb)
- Max. takeoff weight: 1,650 kg (3,638 lb)
- Powerplant: 1 × Vedeneyev M14P 9-cylinder air-cooled radial engine, 268 kW (360 hp)
- weight limit 1,510 kg for aerobatics
- Never exceed speed: 300 km/h (161 knots)
- Maximum speed: 262 km/h (141 knots)
- Cruise speed: 250 km/h (135 knots, 155 mph)
- Stall speed: 114 km/h idle, gear & flaps down (61 knots)
- Range: 750 km (400 nmi, 373 mi) standard 180 liters fuel
- Service ceiling: 4,000 m (13,000 ft) without supplementary oxygen
- Rate of climb: 5.0 m/s (984 ft/min)
Yakovlev - designer and manufacturer of the Yak-18T.
- Gordon, Yefim, Dmitriy Komissarov and Sergey Komissarov. OKB Yakovlev: A History of the Design Bureau and Its Aircraft. North Branch, Minnesota: Specialty Press, 2005. ISBN 978-1-85780-203-0.
- Taylor, Michael J.H. Brassey's World Aircraft & Systems Directory 1999/2000. London:Brassey's, 1999. ISBN 1-85753-245-7.
- EASA Specific Airworthiness Specification for Yakovlev Yak-18T issue 2 http://www.easa.europa.eu/certification/docs/sas/A.095/EASA%20SAS%20A%20095%20Yak-18T_Issue%202.pdf
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