Abstract
A radar antenna model with a frame and a twin-rotor tail unit is experimented with regard to its rotational speed in the wind tunnel with the aim of improving its rotational characteristics. First the antenna dish alone is found rotatable in a wind once it is forced to rotate. The attachment of tail unit is very effective, increasing the rotational speed almost twice as large. Although the torque or power was not measured, a remarkable reduction in the antenna driving power can be expected for the same rotational speed. The attachment of the frame, which is designed to assist the rotation, is not promising due to its possible aerodynamic interference.
