Yakovlev Yak-141

Yakovlev Yak-141
Type:	VTOL - fighter aircraft
Design country:	Soviet Union
Manufacturer:	OKB Yakovlev
First flight:	March 9, 1987
Commissioning:	Development canceled in 1991
Number of pieces:	4th

The Yakovlev Yak-141 ( russian Яковлев Як-141 , NATO reporting name : Freestyle ) is a supersonic-capable VTOL - combat aircraft of the Soviet Union .

history

The program was started in 1975 as a further development of the Jakowlew Jak-38 under the name Jak-41 or Isdelije (product) 48.

Four prototypes were built. The first cell with the designation 48-0 served as a rupture cell, with the 48-1 roll tests and engine tests were carried out. It was marked yellow 48 . The 48-2 ( White 75 ) and 48-3 ( White 77 ) were used for flight tests.

Andrei Sinizin completed the first conventional flight on March 9, 1987, and the first vertical take-off with transition to conventional flight followed on June 13, 1990. During the test, twelve world records were flown. VTOL capability is achieved through a lift and lift / thrust engine configuration. Behind the cockpit are two lift engines that are switched off in level flight. The main engine with swivel nozzle and afterburner is installed in the stern. For the hover flight, the exhaust gas jet is directed downwards by 90 °. Around 1991 the aircraft was renamed Jak-141.

The Jak-141 is fast up to Mach 1.7 and is said to be as agile as the MiG-29 .

On September 26, 1991 Sinizin made the first vertical landing on the deck of the Admiral Gorshkov with the 75 . An hour later, Vladimir Yakimov followed with the 77 . The tests continued until Yakimov made a hard landing on the deck on October 5, 1991, which damaged the fuel tank and caught fire. Yakimov catapulted himself out of the burning machine about 30 seconds later with his 0/0 ejector seat K-36LW. A version called Jak-141M with a more powerful engine was no longer realized, as was its two-seat school version Jak-141U.

In November 1991 the program was stopped because of the shrinking military budget of the Soviet Union.

Technical specifications

Yakovlev Yak-141

Parameter	Data
crew	1
length	18.36 m
span	10.1 m (5.9 m in folded position)
height	5 m
Wing area	31.7 m²
Wing extension	6.16
Wing loading	minimum 368 kg / m² maximum 615 kg / m²
Empty mass	11,650 kg
Max. Takeoff mass	15,800 kg 19,500 kg
Fuel capacity	internal 4,400 kg external 1,750 kg
Top speed	Mach 1.7 (at optimal altitude)
Service ceiling	15,500 m
Max. Rate of climb	approx. 250 m / s
Range	operational 1400 km (with max. payload) Overpass 2100 km
Max. Gun load	2600 kg
Engines	a Soyuz R79-300 turbofan from MNPK Kobchenko as a thrust engine two turbojets RKBM RD-41 from Rybinsk Motors as lift engines
Thrust	with afterburner 152 kN without afterburner 108 kN
Thrust-to-weight ratio	maximum 1.33 minimum 0.94

Preserved copies

Two pieces of the Jak-141 have been preserved: the prototype with the number 75, after it was presented to the public as 141 in Farnborough in 1992 , was parked on the Chodynka field and after the museum there was taken over by the Wadim Sadoroshny Museum of Technology, where it got its original board number again. The prototype with board number 77 was rebuilt after the serious accident of October 5, 1991 with Vladimir A. Jakimow at the wheel and can be viewed today as "141" in the Museum of the Air Force .

literature

• Wilfried Bergholz: Jakowlew. Since 1927 . Motorbuch, Stuttgart 2017, ISBN 978-3-613-04024-3 .
• Wilfried Copenhagen , Jochen K. Beeck: The large aircraft type book . Motorbuch, Stuttgart 2005, ISBN 978-3-613-02522-6 .

Web links

Commons : Jak-141  - Collection of Images

• А. Котлобовский: Як-141: критический момент биографии. In: razlib.ru. February 1992, accessed September 21, 2019 (Russian). 
• Brad Howard: How The F-35 (Probably) Benefited From Soviet Technology. In: taskandpurpose.com. April 24, 2018, accessed May 22, 2018 . 
• Yak-141 VTOL Multi-Role Fighter. www.military-today.com, accessed June 20, 2018 (English). 

Individual evidence

1. ↑ ^{a b} Yak-141 Freestyle. In: globalsecurity.org. Retrieved September 21, 2019 . 
2. ↑ ^{a b} Yakovlev Yak-41 'Freestyle'. In: aeroflight.co.uk. Retrieved June 20, 2018 . 
3. ↑ YAK-41 Crashes On Carrier landing test. www.liveleak.com, accessed on June 20, 2018 (English, with video of the crash landing). 
4. ↑ Yak-141 Freestyle: Specifications. In: globalsecurity.org. Retrieved September 21, 2019 . 
5. ↑ detailed information on global security (Engl.)
6. ↑ Company website (English / Russian)
7. ↑ ^{a b} The performance data refer to the Soyuz R79W-300 engine