Articles related to "Vortex Ring"

Helicopters do not just drop like a stone if the engine fails. But there is one aerodynamic state which can cause an uncontrolled and irreversible descent...ie a crash!

The social and intelligent ways cetaceans have interacted with humans so far suggest that much can be gleaned from the "language" system of these sea mammals.

Many people believe that if the engine stops in a helicopter, it simply falls out of the sky. An instructor explains that this is not true, and describes what to do.

Helicopter students find hovering extremely difficult. An experienced instructor explains how to make it a little easier.