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The High Attitude Robotic Sting (HARS)
is a sting mounting system designed for high angle of attack
testing. The mechanism is able to position a model from -15°
to near +90° pitch with an accuracy within 0.01°, while
still keeping the model near the center of the test section.
HARS is compatible with the wind tunnel turntable, which
allows yaw angles of ±90°. Also, HARS can be mounted with a
mechanism to allow roll angles of ±180°. All model
positioning changes can be made from the control room while
the wind tunnel is still running. Tests that use the HARS
mount acquire data through an internal balance.
HARS with pitch, yaw, and roll control (above
Space Shuttle at a normal angle of attack
F-16 at normal (above) and high (below)
angles of attack
An internal balance is placed inside the model when a sting
mount, such as HARS, is used.
VIDEO to Start.
HARS with Model (courtesy of Lockheed Martin)
Change in Angle of Attack, Alpha: +10°
Change in Roll Angle: -90° to
Oran W. Nicks Low Speed Wind
Texas A&M University
1775 George Bush Drive West,
College Station, TX 77845