The TD550D coaxial unmanned helicopter system has received its type certificate from the Civil Aviation Administration of China, the first of its kind to have obtained such certification in China, its ...

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

SHENZHEN -- The TD550D coaxial unmanned helicopter system has received its ... and verification across multiple areas, including the rotor system, power system, avionics and flight control.

The second variant is a helicopter with a combined powerplant, which comprises the main rotor and additional lateral propellers pulling the rotorcraft forward. The third scheme is a coaxial rotor ...