Suddenly there’s a red-hot competition under way to develop rotorcraft capable of flying at sustained speeds well above the theoretical limits of conventional helicopters. To meet the challenge, ...

The speed limiter in question here is called retreating blade stall. You can think of a helicopter's top rotor blades as wings – wings capable of varying their pitch to generate more or less lift as ...

Utility helicopters delivering infantry under heavy enemy fire in 2030 will need new levels of speed, maneuverability and agility to succeed in an entirely new sphere of high-speed combat intensity.

A team of US Army, Navy and NASA researchers has successfully tested a helicopter rotor blade with a variable-droop leading edge (VDLE) that could dramatically expand the operational envelope of ...

What would it mean to future warfare if an armed, high-tech utility helicopter could deliver troops for attack under hostile fire, MEDEVAC injured soldiers on the brink of death, conduct high-risk ...

UNLIKE a helicopter, aeroplanes are inclined to fly, Harry Reasoner, a veteran American newsman, wryly observed after watching choppers in action during the Vietnam war. He wrote: A helicopter does ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Early helicopter engineers soon ...