Mike Hirschberg, director of strategy at the nonprofit Vertical Flight Society, says that a “general barrier” for traditional helicopter speed has been around 200 knots (230 mph), something ...

Half-breed: Piasecki Aircraft has taken a Sikorsky helicopter and bolted on airplane hardware — a propeller (ducted) and a fixed wing — hoping the resulting X-49A SpeedHawk (top) will bust ...

If all goes according to plan, the X2 should crush that record with its 288-miles-per-hour flight this fall and usher in a new era in helicopter utility. Photos: Sikorsky Comments ...

A propeller at the rear of the helicopter allows the X2 pilot to fly at higher speeds while minimizing the problems associated with high speed flight and the main rotors.

An electric helicopter – powered by 18 propellers – has made its maiden flight. Could it be the future of urban transport?

I guess we’re on a UAV kick – I ran across this one when I was looking for interesting propeller projects. [Glenn]’s building this one based on a R/C helicopter he picked up. Both… ...

There are helicopter drones and fixed-wing drones, but creating a hybrid of both is tricky. Even Parrot's Swing, as clever as it is, needs four propellers and elaborate wings to pull off its stunt.

An electric helicopter – powered by 18 propellers – has made its maiden flight. Could it be the future of urban transport?