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3 matches in All Departments
The Air Force Research Lab, Munitions Directorate, Flight Vehicles
Integration Branch (AFRL/MNAV) developed a manportable,
carbon-fiber matrix UAV with a flexible rectangular wing of 24 span
and 6 chord, 18.2" length. There is a need for the development of
smaller and lighter UAV's to perform certain missions. The
objective of this experimental study was to determine the behavior
and the aerodynamic characteristics of rotary tails. The
bird-inspired rotary tail mechanism studied enabled control of two
degrees of freedom and was configured to provide elevator
deflection and rotation. Its effects on the static stability and
control effectiveness were measured using the Air Force Institute
of Technology (AFIT) low speed wind tunnel. The yaw moment provided
by each rotary tail was found to be on the same order of magnitude
as a typical rudder, and in that respect it offers promise as an
effective flight control scheme. However, it was also found that
the side force, and consequently the yaw moment, generated by the
two tail controls (elevator deflection and rotation) were strongly
coupled, which could lead to challenging aircraft control issues. A
benefit is that the configurations used in this thesis would reduce
the storage length by 48%.
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