Prox Dynamics Hornet-3

Prox Dynamics of Asker, Norway, has developed one of the world’s smallest unmanned helicopters. The Hornet-3a is a completely new design featuring a new brushless motor, a complete array of flight sensors including a pressure sensor, gyros, accelerometers, magnetometers and a two way digital radio link.

One of the more pronounced differences when airborne is the sound picture. The direct drive main motor makes the helicopter almost noiseless except for the humming from the high RPM tail rotor. The propulsion system is far more efficient than in the Hornet-2, and Hornet-3a has already demonstrated more than 25 minutes continues flying on a single battery charge.

Source: Prox Dynamics, via CNET News