[DOC] [TLE] How does a helicopter work? - Explain that Stuff [PAR] Aug 8, 2016 ... How do spinning rotor blades act like airfoils and why do helicopters need a tail 
rotor? ... had been trying to develop flying machines with spinning rotors for over 
2000 ... Planes make lift with airfoils (wings that have a curved cross-section). ... 
in a single fixed wing, they have them built into their rotor blades,... [DOC] [TLE] How does a helicopter fly? - Quora [PAR] Literally entire books have been written on this subject (as well as a few that 
claim helicopters ... The counter-rotation was necessary because a single rotor 
creates a .... As the blade spins around, it forces air over its curved upper surface 
and then ... Air moving over and under the blades causes a pressure differential 
which... [DOC] [TLE] The (Disputed!) Principles of Flight - 3DR [PAR] Sep 17, 2015 ... Whatever you want to call them  drones, UAVs, sUAS, flying ... claims that the 
air (which is a fluid) moving over the curved surface has to ... the airfoil shape 
creates the lift that pulls the plane up  and it's the ... Where wings force air 
under them, helicopter blades literally beat the air down to generate lift. [DOC] [TLE] Chapter 02: Aerodynamics of Flight [PAR] Four forces acting on a helicopter in forward flight. Lift. Weig ht .... above the 
curved portion and creates a pressure differential caused by ... Under most flying 
conditions, the impact pressure and the deflection ... weight of the helicopter and 
its occupants. Newton's .... Because the lift produced by the blade is 
perpendicular to. [DOC] [TLE] Helicopter Flight Cause and Effect - Chuck Gardner [PAR] The shape of the rotor is usually curved asymmetrical shape more similar to bird's 
... While hovering over the same spot the cyclic pitch of the main rotor blades is 
equal, ... As the forward speed of a helicopter increases the transitional lift will 
cause it ... But the stability comes at the cost of speed because the two rotors 
create... [DOC] [TLE] Vortex ring state - Wikipedia [PAR] The vortex ring state, also known as settling with power, is a dangerous condition 
that may arise in helicopter flight, when a vortex ring system engulfs the rotor 
causing severe loss of lift. The FAA sees these terms as synonymous, whereas 
Transport Canada sees them as two different phenomena. ... Essentially, the 
helicopter descends into its own downwash. [DOC] [TLE] Airfoil - Wikipedia [PAR] An airfoil (in American English) or aerofoil (in British English) is the shape of a 
wing, blade or ... The lift on an airfoil is primarily the result of its angle of attack 
and shape. ... are built with airfoil-shaped cross sections, as are helicopter rotor 
blades. ... An airfoil-shaped wing can create downforce on an automobile or other
... [DOC] [TLE] How does the air pressure get lower above a helicopter's rotor's ... [PAR] Nov 26, 2013 ... How Things Fly Smithsonian National Air and Space Museum ... Helicopter 
propellers have rotor blades that are similar to an airplane wing; the ... The air 
pressure will decrease once it passes over the curve because the limited ... This 
creates low pressure above the rotor and high pressure below the rotor. [DOC] [TLE] The Airfoil Misconception in K-6 Textbooks [PAR] Airplanes fly because of Newton's 3rd law (action/reaction forces,) the law of ... 
Airfoils are curved on top and flat below, and therefore the air follows a ... 
Because lift is caused by the shape of the wing, wings can create lift at zero 
attack angle. .... It depicts ground-effect flight where altitude above a surface is 
always much... [DOC] [TLE] How does an airplane wing generate lift? | Science-Based Life [PAR] Feb 6, 2012 ... He created the short video below to hopefully put this misconception to bed. ... In 
other words, it's the curvature that creates lift, not the distance. .... The Bernoulli 
principle does not apply because this is not a constant energy ... false by the

Question: A helicopter can fly because its blades are curved to create differential in this above & below them
Answer: air pressure