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 ...

January 6, 2009 Conventional helicopters are incredibly useful vehicles in many short-range scenarios - but their asymmetrical aerodynamics enforce a fairly low terminal speed limit of around 150mph, ...

Here’s What You Need to Know: Lockheed-Sikorsky-Boeing engineers, builders and weapons developers of the DEFIANT X have found a way to massively decrease or even remove what’s called “Retreating Blade ...

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, ...

Helicopter speeds have traditionally been limited by a phenomenon called “retreating blade stall,” which describes what happens to the main rotor at high speed. The relative wind on the retreating ...

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 ...