Sikorsky reported successful flight tests for its 115-pound, battery-powered twin prop-rotor unmanned aircraft.

We were lucky to get our hands on an Ari Signal Peak Team pre-launch to get some impressions and race this season.

Lockheed Martin's Sikorsky demonstrates the flight capabilities of its rotor blown wing unmanned aircraft system at its facility in West Palm Beach, Florida. (Lockheed Martin) ...

Abstract: EXACT mathematical relations between the characteristic impedance and the physical dimensions of circular concentric and eccentric coaxial lines, as well as of coaxial lines having square ...