NASA's
F-14 (tail number 991, Navy serial number 157991) in 1980, soon after
its arrival at the Dryden Flight Research Center. The aircraft has its
landing gear down and its wings swept forward. At the nose, the
hydraulically actuated canards are extended. Other modifications for
high angle of attack and spin tests were an auxiliary power unit, a nose
boom, and an emergency spin chute.
Langley Research Center engineers, in partnership with Grumman and Honeywell, developed new control laws involving an aileron/rudder interconnect (ARI) that succeeded in limiting departures and providing recoveries from spins, following the loss of several F-14s in spins due to their automatic flight-control system's control law architecture. The F-14 with the new control laws proved to be "very responsive and maneuverable above 30 degrees angle-of-attack, with no abrupt departure or spin tendencies."
September 5, 1980
NASA Photo
NASA 834, an F-14 Navy Tomcat, was used at Dryden in 1986 and 1987 in a program known as the Variable-Sweep Transition Flight Experiment (VSTFE). This program explored laminar flow on variable sweep aircraft at high subsonic speeds.
An F-14 aircraft was chosen as the carrier vehicle for the VSTFE program primarily because of its variable-sweep capability, Mach and Reynolds number capability, availability, and favorable wing pressure distribution.
The variable sweep outer-panels of the F-14 aircraft were modified with natural laminar flow gloves to provide not only smooth surfaces but also airfoils that can produce a wide range of pressure distributions for which transition location can be determined at various flight conditions and sweep angles.
Glove I, seen here installed on the upper surface of the left wing, was a "cleanup" or smoothing of the basic F-14 wing, while Glove II was designed to provide specific pressure distributions at Mach 0.7.
Laminar flow research continued at Dryden with a research program on the NASA 848 F-16XL, a laminar flow experiment involving a wing-mounted panel with millions of tiny laser cut holes drawing off turbulent boundary layer air with a suction pump.
July 2, 1986
NASA Photo
Z pozdrowieniami
Art
Langley Research Center engineers, in partnership with Grumman and Honeywell, developed new control laws involving an aileron/rudder interconnect (ARI) that succeeded in limiting departures and providing recoveries from spins, following the loss of several F-14s in spins due to their automatic flight-control system's control law architecture. The F-14 with the new control laws proved to be "very responsive and maneuverable above 30 degrees angle-of-attack, with no abrupt departure or spin tendencies."
September 5, 1980
NASA Photo
NASA 834, an F-14 Navy Tomcat, was used at Dryden in 1986 and 1987 in a program known as the Variable-Sweep Transition Flight Experiment (VSTFE). This program explored laminar flow on variable sweep aircraft at high subsonic speeds.
An F-14 aircraft was chosen as the carrier vehicle for the VSTFE program primarily because of its variable-sweep capability, Mach and Reynolds number capability, availability, and favorable wing pressure distribution.
The variable sweep outer-panels of the F-14 aircraft were modified with natural laminar flow gloves to provide not only smooth surfaces but also airfoils that can produce a wide range of pressure distributions for which transition location can be determined at various flight conditions and sweep angles.
Glove I, seen here installed on the upper surface of the left wing, was a "cleanup" or smoothing of the basic F-14 wing, while Glove II was designed to provide specific pressure distributions at Mach 0.7.
Laminar flow research continued at Dryden with a research program on the NASA 848 F-16XL, a laminar flow experiment involving a wing-mounted panel with millions of tiny laser cut holes drawing off turbulent boundary layer air with a suction pump.
July 2, 1986
NASA Photo
Z pozdrowieniami
Art
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