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The vortex ring state (VRS) is a dangerous aerodynamic condition that may arise in helicopter flight, when a vortex ring system engulfs the rotor, causing severe loss of lift. Often the term settling with power is used as a synonym, e.g., in Australia, the UK, and the US, [2] [3] [4] but not in Canada, which uses the latter term for a different ...
SADARM development can be traced back to the early 1960s. The original platform for the submunition was the 203 mm M509 Improved Conventional Munition (ICM) projectile, and the concept was demonstrated in the late 1970s.
Spark photography image of a vortex ring in flight. A vortex ring, also called a toroidal vortex, is a torus-shaped vortex in a fluid; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal, more precisely poloidal. [clarification needed]
This template is placed at the bottom of the Timeline of United States history articles to aid navigation in the series.. This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible.
A People's History of the United States; Cyclopaedia of Political Science, Political Economy, and the Political History of the United States; Land of Promise: An Economic History of the United States; The History of the United States of America 1801–1817; Oxford History of the United States; The Penguin History of the United States of America ...
A major cold blast is in store for more than 30 states as a widespread arctic air outbreak will send nearly every American east of the Rockies into a deep freeze. This will be due to a polar ...
Records are being shattered and communities are enduring the harshest cold in decades as the polar vortex tightens its grip on the midwestern United States.
Main rotor disk vortex interference Weathercock stability Tail rotor vortex ring state. Loss of tail-rotor effectiveness (LTE) [1] occurs when the tail rotor of a helicopter is exposed to wind forces that prevent it from carrying out its function—that of cancelling the torque of the engine and transmission. Any low-airspeed high-power ...