[DOC] [TLE] Chapter 02: Aerodynamics of Flight [PAR] Four forces acting on a helicopter in forward flight. Lift. Weig ht ... Angle of attack (
AOA) between the air and the airfoil. The AOA is ... due to this pressure gradient 
and the viscosity of the fluid, the flow over the object is accelerated down along 
the upper surface of .... weight (weight of the helicopter and its contents). Any time
. [DOC] [TLE] Lift (force) - Wikipedia [PAR] A fluid flowing past the surface of a body exerts a force on it. Lift is the component 
of this force that is perpendicular to the oncoming flow direction. It contrasts with 
the drag force, which is the component of the surface force parallel to the flow 
direction. If the fluid is air, the force is called an aerodynamic force. .... An airfoil 
generates lift by exerting a downward force on the air as it flows... [DOC] [TLE] How Airplanes Fly - Real World Physics Problems [PAR] Learn how airplanes fly, with discussion on subsonic, supersonic, and 
hypersonic ... The lift force "holding" a plane up is generated by airflow over the 
wings. ... But basically, the air flow pattern around an airfoil results in the lower 
half of the ... An airplane undergoing takeoff, or landing, experiences similar 
forces acting on it. [DOC] [TLE] the forces acting on the airplane in flight [PAR] Lift and Drag are considered aerodynamic forces because they exist due to the ... 
of the air as it meets and passes over and about an airplane and its components. 
... The special shape of the airplane wing (airfoil) is designed so that air flowing... [DOC] [TLE] How Airplanes Fly - RC Airplane World [PAR] How airplanes fly - aerodynamic forces acting on a plane in flight ... that an airfoil 
generates significantly more lift than opposing drag i.e. it's very efficient at 
generating lift. During flight air naturally flows over and beneath the wing and is 
deflected ... of the wing, the ailerons control the airplane's roll about its 
longitudinal axis. [DOC] [TLE] How does an airplane wing generate lift? | Science-Based Life [PAR] Feb 6, 2012 ... This is the principle acting on an airplane wing. ... deflection of air VS a vacuum 
affect generated by airfoil over the top of a wings surface. ... Dave, In a bank, the 
lift force is now non vertical and, if nothing else .... along the path of a fluid flow,
the velocith changes (accelerations) are due to pressure changes. [DOC] [TLE] The forces on an airplane | Physics | MIT+K12 | MIT+K12 | Khan ... [PAR] Apr 24, 2012 - 9 minIt's not magic. Learn about the forces that help (and hinder) airplane flight. ...  Airplane ... [DOC] [TLE] Ch3Airfoil.rtf [PAR] Figure 3.1 shows a cross section view of an aircraft wing. ... Lines drawn above 
and below the airfoil indicate how the air flows around it. ... Each streamline is 
drawn so that at every point along its length, the local velocity vector is tangent to 
it. ... For such a situation, the only significant forces remaining are due to pressure
... [DOC] [TLE] 3 Airfoils and Airflow - Av8n.com [PAR] Whenever the airplane applies a downward force to the air, the air applies an ... 
which is the dividing line between air that flows over the top of the wing and air .... 
The maximum suction near an airfoil depends on the angle of attack, and on the 
... wing is vastly more important than pressure acting on the bottom of the wing. [DOC] [TLE] TFCtext05.Aerodynami.. - Thai Flying Club [PAR] As the air flows over the wing's surface, it too exerts pressure in two directions
in the .... the component of aerodynamic force generated on the aircraft which 
acts ... the variable static pressure distribution, acting perpendicular to the surface
. ... The lift force itself is primarily due to the pressure distribution imbalance over 
the... [DOC] [TLE] aerodynamics facts, information, pictures | Encyclopedia.com ... [PAR] Simply put, aerodynamics is the study of airflow and its principles, and applied ... 
though the downward force is not as

Question: In aerodynamics it's the vertical force acting on a plane due to flow of air over its aerofoils
Answer: lift