Part of the NASA technology demonstrators, X31 was designed to test thrust vectoring technology by using a delta wing, canards, and vectored thrust from the engine. Designed and built by Rockwell and MesserschmittBölkowBlohm or MBB, The X31 was part of a joint US and German project known as the Enhanced Fighter Maneuverability program or EFM. The goal of the EFM was to use thrust vectoring and an advanced flight control system to provide enhanced control authority in pitch and yaw, this resulted in significantly more maneuverability than most conventional fighters.
A true international testbed aircraft, the X31 operated out of Edwards AFB and was part of some NASA Dryden experiments.

Let's take a look at the Specifications for the X31:

Specifications
Length: 43 FT 4 IN (13.21 M)
Height: 14 ft 7 IN (4.44 M)
Wingspan: 23 FT 10 IN (7.26 M)
WingArea: 2,436 sq FT2 (226.3 M2)
Maximum speed: 782 KN (1,449 KM/H, 900 MPH)
Mach 1.28

Empty weight: : 11,409 lb (5,175 kg)
Loaded weight:
Max. takeoff weight: 35,131 LB (15,935 KG)


Engine Thrust Class

GENERAL ELECTRIC F404GE400 turbofan engine, 71 KN (16,000 LBF) THRUST

Link to the F15 ACTIVE video:    • NASA's 837: The Ultimate Modified F15!  

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Credits/Attributions:
"The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement."

NASA footage and images courtesy of
https://images.nasa.gov/

Photography Credits:
X31 on display at museum photo:
Vestman from Helsinki, Finland / CC BY (https://creativecommons.org/licenses/...)
Saab Viggen Photo:
Alan Wilson / CC BYSA (https://creativecommons.org/licenses/...)

Dassault Rafale Photo:
Tim Felce (Airwolfhound) / CC BYSA (https://creativecommons.org/licenses/...)



Music from https://filmmusic.io "Hiding Your Reality" by Kevin MacLeod (https://incompetech.com) License: CC BY (http://creativecommons.org/licenses/b...)

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(This does not include the audio commentary or licensed BGM). avgeek