page_title: McDonnell Douglas F-15 STOL/MTD
section_title: Further modifications
hierarchical_section_title: McDonnell Douglas F-15 STOL/MTD / Design and development / Further modifications
caption_attribution_description: English: Image of the McDonnell Douglas F-15 ACTIVE fighter aircraft in its first supersonic yaw vectoring flight.
context_page_description: The McDonnell Douglas F-15 STOL/MTD is a modified F-15 Eagle. Developed as a technology demonstrator, the F-15 STOL/MTD carried out research for studying the effects of thrust vectoring and enhanced maneuverability. The aircraft used for the project was pre-production TF-15A No. 1, the first two-seat F-15 Eagle built by McDonnell Douglas, the sixth F-15 off the assembly line, and was the oldest F-15 flying up to its retirement. It was also used as the avionics testbed for the F-15E Strike Eagle program. The plane was on loan to NASA from the United States Air Force.
  This same aircraft would later be used in the F-15 ACTIVE from 1993 to 1999, and later in the Intelligent Flight Control System programs from 1999 to 2008.
  While with NASA, the aircraft's tail number was 837; for the Quiet Spike program and Research Testbed it was 836, and 835 was used for the Highly Integrated Digital Electronic Control program.
context_section_description: During the 1990s the same F-15 airframe (USAF S/N 71-0290) was further modified (canards and nozzles were retained) for the ACTIVE (Advanced Control Technology for Integrated VEhicles) program in which Pitch/Yaw Balance Beam Nozzles (P/YBBN) and advanced control-logic programming were investigated.  In the ACTIVE configuration it was also used for the LANCETS (lift and nozzle change effects on tail shock) program, in which computed supersonic shockwave parameters were compared to those measured in flight.  The LANCETS flight tests ended in December 2008.  F-15 ACTIVE lasted from 1993–99.
  The aircraft would later be used in the F-15 IFCS (Intelligent Flight Control System) program from 1999 to 2008. The plane was also used for the Space-Based Range Demonstration and Certification project under the Exploration Communications and Navigation Systems program (SBRDC/ECANS) from 2006 to 2007, High Stability Engine Control (HISTEC) program and High-Speed Research Acoustics in 1997.
caption: F-15 ACTIVE in 1996
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