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what if an aircraft could fly without

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the rear vertical stabilizer and rudder

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what would be the advantages better yet

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how could it be done the x31

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International test team is helping

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explore these possibilities at NASA's

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Dryden Flight Research Center Edwards

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California x31 team members previously

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demonstrated supersonic quasi tailless

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capabilities in March of 1994 quasi

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tailless is a state of simulated reduced

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tail or tail as flight through

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destabilizing feedback to the ship's

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rudder and ailerons closed-loop

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stability and control is then completely

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provided by the x31 s unique thrust

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vectoring system this work has captured

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the interests of the joint advanced

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strike technology or jest program group

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members from the US Navy Marine Corps

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and Air Force have joined together

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technology for the next generation of

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fighter aircraft the benefits are

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decreased weight and drag this will

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increase range and make future aircraft

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smaller resulting in less expensive more

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affordable strike fighter aircraft the

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x31 team at NASA Dryden was chosen

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because the x31

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is capable of gathering this data now

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not three to five years in the future

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the x31 test team and jest will conduct

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a two phase flight experiment to include

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simulated power approach and ground

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attack maneuvers at low altitude for

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multiple levels of destabilization phase

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one emphasis will be on validating the

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simulation model for tail thus flight

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test maneuvers will be conducted at

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20,000 feet and 8,000 feet and lower in

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both cruise and power approach

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configurations at Mach numbers point

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three four point six and point eight the

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levels of D augmented stability from the

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rudder and ailerons planned to be varied

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a minimum of between 100 percent tail

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off to full tail during this test phase

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of roughly 10 to 12 sorties the power

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approach tailless flight was initiated

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by the IT o test team September 1st

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phase two testing will demonstrate the

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operational viability

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of tailless flight through quasi

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tailless testing simulated ground attack

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maneuvers and precision approaches will

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be flown the objective will be to

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provide flight validated data supporting

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future tailless designs eight to ten

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test flights under these conditions

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should meet those objectives upon

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completion the x31 test team will

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analyze the test data and provide a

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final report and briefing of their

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accomplishments in quasi tailless

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research to the Jass program managers in

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washington d.c the IT o test team at

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nasa dryden continues to plan for a

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reduced tail tailless x31 flight

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the x31 international test team

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demonstrated supersonic quasi tailless

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capabilities in march 1994 quasi

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tailless is a state of simulated reduced

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tail or tail thus flight through

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destabilizing feedback to the ship's

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rudder and ailerons at this point the

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x31 s thrust vectoring system provides

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closed-loop stability and control

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tailless flight would decrease aircraft

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weight and drag increasing their range

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this would lead to smaller aircraft in

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the future resulting in less expensive

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more affordable strike fighter aircraft

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the x31 project at nasa dryden was

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chosen because the aircraft can provide

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immediate test results the x31 test team

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and the joint advanced strike technology

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team from the US Air Force Navy and

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Marine Corps will conduct a two phased

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flight experiment to gather this data

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phase one emphasis will be on validating

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the simulation model for tailless flight

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test maneuvers will be conducted at

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20,000 and 8,000 feet and lower in both

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cruise and power approach configurations

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this test phase began September 1st 1994

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phase two testing will demonstrate the

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operational viability of tailless flight

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through quasi Taylors testing simulated

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ground attack maneuvers and precision

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approaches will be flown upon completion

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the x31 test team will analyze the data

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and provide a final report to the Jazz

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program managers in Washington DC from