coning angle — The angle between a rotor blade and a plane passing through the rotor hub or at right angles to the lift vector. Also, an angle formed by the rotor blades with the tip path of the plane. It is indicated by the symbol β … Aviation dictionary
pre-coning — Rotor blades in which the coning angle has been accommodated in the design itself. The coning angle is the angle between a rotor blade and a plane passing through the rotor hub or at right angles to the lift vector. See coning angle … Aviation dictionary
overpitching — A condition in helicopters in which when the rotor RPM decreases, the pilot is unable to restore the thrust even by pulling up the collective. The more the pilot raises the collective, the lower is the rotor thrust. This condition is more likely… … Aviation dictionary
Helicopter rotor — This article is about helicopter main rotor systems. For antitorque control, see tail rotor. Helicopter rotor The rotor head of a Sikorsky S 92 A helicopter main rotor or rotor system is a type of fan that is used to generate both the aerodynamic … Wikipedia
Fracturation hydraulique — La « fracturation hydraulique » est la dislocation ciblée de formations géologiques peu perméables[1]’[2] par le moyen de l injection sous très haute pression d un fluide destiné à fissurer et micro fissurer la roche. Cette fracturation … Wikipédia en Français
helicopter — /hel i kop teuhr, hee li /, n. 1. any of a class of heavier than air craft that are lifted and sustained in the air horizontally by rotating wings or blades turning on vertical axes through power supplied by an engine. v.i. 2. to fly in a… … Universalium
Railroad switch — For other uses, see Switch (disambiguation). A right hand railroad switch with point indicator pointing to right … Wikipedia
Solar sail — Solar sails (also called light sails or photon sails, especially when they use light sources other than the Sun) are a proposed form of spacecraft propulsion using large membrane mirrors. Radiation pressure is about 10 5 Pa at Earth s distance… … Wikipedia
Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations … Wikipedia
Robinson R22 — Infobox Aircraft name=Robinson R22 caption= type=Light utility and trainer helicopter manufacturer=Robinson Helicopter Company designer=Frank Robinson first flight=1975 introduced=1979 retired= status= primary user= more users= produced= number… … Wikipedia
Ole Rømer — Rømer redirects here. For other uses, see Romer (disambiguation). Ole Rømer Ole Rømer, portrait by Jacob Coning from c. 1700 … Wikipedia