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 ...

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 ...

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 ...

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 ...