The Yak-41 program was initiated in 1975, about the same time that the Yak-38 was first being deployed. The supersonic Yak-41 (NATO name 'Freestyle') was optimized for air defense with an attack capability as a secondary role.

The first conventional flight was made on 9 March 1987 and the first hover on 29 December 1989. The first official details were not released by the Soviet Union until the 1991 Paris Air Show (re-designated as the Yak-141) by which time the two flying prototypes had accumulated about 210 hours in the air. A dozen FAI-recognized Class H. III records for V/STOL were set in April 1991, consisting of altitudes and times to altitudes with loads. In flight testing, the Freestyle achieved a maximum speed of 1.7 Mach, and maneuverability was repeatedly claimed to be almost as good as that of the MiG-29 Fulcrum (although the small wings of the Freestyle make this extremely doubtful).

Flight testing was originally intended to continue until 1995, but development was stopped in August 1991 due to the shrinking Soviet military budget. Yakovlev funded the development from its own resources for a while, in the hopes of attracting a foreign investor. The second flight prototype was destroyed after a hard landing on the Admiral Gorshkov aircraft carrier on 5 October 1991. The following year, the surviving prototype was demonstrated at the Farnborough Air Show, but the design bureau was still unable to find a market for the design.

Note: The '99' for the 'Number of control devices' indicates that the number if devices is unknown although it is believed that the aircraft employed thrusters at the the nose, tail and wing tips

Source: AHS V/STOL Wheel

Overview

Data on design, manufacture and status

Design authority: A.S. Yakovlev Design Bureau

Primary manufacturer: A.S. Yakovlev Design Bureau

Parent type: No type defined

Aircraft status: No longer flying

Configuration

Primary flight and mechanical characteristics

VTOL type: Jet lift VTOL

Compound type: N/A

Lift configuration: Combined lift devices (x3)

Dedicated control device: Other (x99)

Crew required: 1

Crew seating: Single seater

Landing gear: Wheels (all retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height:  
Overall Length:  
Overall Width:  
Airframe Dimensions
Airframe Length:  
Airframe Width:  
Airframe Height:  
Landing Gear Dimensions
Landing Gear Base:  
Landing Gear Track:  
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Weights
Max Gross Weight (ground):  
Max Gross Weight (airborne):  
Max Take-off Weight:  
Empty Weight:  
Useful Load:  
Empty Weight Fraction:  
Climb Performance
Max Rate of Climb:  
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Limitations
Max Level Flight Speed:  
Never Exceed Speed:  
Service Ceiling:  
Range and Endurance
Max Range:  
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

Provided powerplant data is for uninstalled, sea level, static operations.

Powerplant
Number of engines: 3
Normal Ratings
Max continuous:  
Take-off / rated:  
Intermediate:  
Maximum:  
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

Main Rotor Characteristics
Diameter:  
RPM:  
Direction of Rotation: Unknown
Hub Type:  
Main Rotor Blade Characteristics
Blade Construction:  
Blade Chord:  
Blade Tip Geometry:  
Blade Twist:  
Number of Blades:  
Main Rotor Derived Characteristics
Disc Area:  
Disc Loading:  
Solidity:  
Main Rotor Blade Derived Characteristics
Blade area per blade:  
Tip Speed:  

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Diameter:  
Configuration: Unknown
Direction of Rotation: Unknown
RPM:  
Tail Rotor Blade Characteristics
Number of Blades:  
Blade Construction: N/A
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area:  
Solidity:  
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

Related VFS Resources

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Related Public Resources

Resources related to the Yak-141 , provided by public sources across the internet.

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