Yakovlev Yak-41/141 "Freestyle"

From rec.aviation.military FAQ by Ross Smith (avfaq@meanmach.actrix.gen.nz)

Design of the Yak-41 (or possibly Yak-141; see below) began in 1975; the first prototype flew in March 1987, followed by a second in April 1989. Tests were conducted on the aircraft carrier "Admiral Gorshkov". In April 1991, one of the prototypes set several records for VTOL aircraft; it was displayed at the Paris Air Show shortly afterwards. One prototype was lost in a crash (attributed to pilot error) on the carrier in November 1991, after which development was suspended (due to lack of funds rather than any problems with the aircraft); the surviving aircraft was mothballed.

Yakovlev have recently announced their intention to restart development of the Yak-41, apparently as a result of renewed interest from the Russian Ministry of Defence (a similar revival of the twin-turboprop Yak-44 AEW aircraft is also being considered).

A more advanced version, the Yak-41M (Yak-141M?), has also been designed, with the emphasis now on Air Force rather than Navy service. This version has an extensively modified airframe, with a strong emphasis on stealth (there is a distinct resemblance to the F-22), a much more powerful engine, and more fuel and payload.

The "Freestyle" has been referred to as both Yak-41 and Yak-141; it appears that one designation refers to the standard fighter and one to the single prototype modified for record attempts, but there seems to be some uncertainty as to which is which.

The Russians have had some success in adapting several fighters and attack aircraft for carrier service. Carrier tests were made by modified MiG-29 and Su-27 fighters, and by trainer versions of the Su-25; the naval MiG-29K was cancelled, but the Su-33 (based on the Su-27K) and Su-25UTG have entered service. A report of an early MiG-29K being torn in half on its first attempt at a tailhook arrest gives a hint of the difficulties involved.

Yak-141 records (1991)

From Kryl'ya Rodiny
Thanks to Rodion Podorozhny (podorozh@dino.cs.umass.edu)

Class H: VTOL jets
Group III: turbojets
Pilot: A. A. Sinitsin

DateRecordPerformance
11 Apr 91Time of climb to 12,000 m116.15 sec
11 Apr 91Time of climb to 12,000 m with 1,000 kg116.50 sec
12 Apr 91Time of climb to 3,000 m with 1,000 kg62.41 sec
12 Apr 91Time of climb to 6,000 m with 1,000 kg74.37 sec
12 Apr 91Time of climb to 9,000 m with 1,000 kg89.09 sec
24 Apr 91Max payload at 2,000 m2,507 kg
25 Apr 91Max altitude with 1,000 kg13,115 m
25 Apr 91Max altitude with 2,000 kg13,115 m
25 Apr 91Time of climb to 3,000 m with 2,000 kg68.82 sec
25 Apr 91Time of climb to 6,000 m with 2,000 kg88.88 sec
25 Apr 91Time of climb to 9,000 m with 2,000 kg110.10 sec
25 Apr 91Time of climb to 12,000 m with 2,000 kg130.64 sec

All flights were performed as following: vertical take-off (at least 20 m), than acceleration to 1,000 km/h at level (100-200 m) followed by vertical (90 degree) flight to desired altitude (270 m/sec).

Armament

External load carried on four underwing pylonsRadius
4xR-77670 km
4xR-77 + 1x2,000l fuel tank (centerline)900 km
2xR-77 + 2xR-73E + 1x2,000l fuel tank900 km
2xKh-35 + 2xR-73E + 1x2,000l fuel tank780 km
4xKh-35A + 1x2,000l fuel tank550 km
4xKh-35N + 2xRVK-AE + 1x2,000l fuel tank670 km
6xABSP up to 500 kg420 km
4xNRS 87-240 mm + 1x2,000l fuel tank670 km
2xKh-31P + 2xR88-AE + 1x2,000l fuel tank670 km
2xK25 + 2xR-73E + 1x2,000l fuel tank820 km
Gsh-23: 250 rounds each + 1x2,000l fuel tank820 km

Yak-141 has an internal 30 mm canon with 120 rounds

Origin