Secondary stall

A term applied in the early 19th century as a syn. of Floetz. It was later applied to the extensive series of stratified rocks separating the older Primary and the younger ...

stall

Sports; Surfing

A maneuver designed to slow down a surfboard so the surfer can let the power portion of the wave catch up.

stall

Aviation; Aircraft

A rapid decrease in lift caused by the separation of airflow from the wing’s surface, brought on by exceeding the critical angle of attack. A stall can occur at any pitch attitude ...

stall

Energy; Energy efficiency

In reference to a wind turbine, a condition when the rotor stops turning.

bearing surface

Aviation; General aviation

One of the surfaces of a flying-machine which bears, rests, or acts upon the air; a supporting surface; a sustaining surface; a wing surface; a spread of wing or sail.

breeze

Aviation; General aviation

A moderately brisk wind; a movement of the air not so strong as a gale or as a stiff breeze. The following are several different types of breeze: : ''fresh breeze,'' a breeze ...

anemometer

Aviation; General aviation

An instrument for measuring the velocity, pressure, or other properties of the wind; a wind-gage; a wind-meter. The following are different types of anemometer: : ''Biram's ...

aerial image

Aviation; General aviation

An image appearing suspended in the air, caused by the convergence of rays of light reflected or refracted from objects through strata of air of different densities; a mirage.

aerometry

Aviation; General aviation

The science of measuring the weight or density of air and other gases, and of determining the laws of their pressure, elasticity, rarefaction, and condensation; pneumatics.

bank

Aviation; General aviation

Incline or slant an aeroplane flying-machine laterally (with the inner side downward) in turning or going round a curve, so as to take advantage of the resistance of the bank or ...