Research Paper on:
How Helicopters Fly

Unformatted Sample Text from the Research Paper:
include how the craft achieves lift, the effect of the air flowing over the blades, torque, drag and centrifugal force. The effects of transverse flow and settling with power are  also included in the discussion. The writer incorporates Bernoullis effect and Newtons laws throughout the essay. There has been an ongoing debate about whether the Bernoulli effect  or principle should even be considered when discussing airplanes and helicopters or whether only Newtons laws of motions should be considered. It would seem that both are important to understand  how helicopters fly. Some argue that the main lift for the aircraft is gained because the wing has an upward angle which forces the air hitting the underside of the  wing forces it downward (Eastlake, 2007). It is Newtons third law that has to do with reaction force that provides the lift (Eastlake, 2007). Bernoullis principle is generally explained  using a venturi tube, which is a cylindrical tube that is squashed in the middle (ALLSTAR, 2004). The principle states that as a fluid passes through this tube, when it  reaches the smaller opening, the squashed part, the fluid gains speed as it passes through (ALLSTAR, 2004). In other words, as the fluid passes through the smaller part of the  tube, it increases velocity while it decreases pressure. Air is a fluid so the principle applies to air. The reason for the extra speed has to do with the  energy needed for the molecules to pass through the squished part of the tube, which, in turn reduces the pressure (ALLSTAR, 2004). The pressure changes so that it is different  at one point than at the other point (ALLSTAR, 2004). As the pressure decreases over the top of the rotor blade, lift is achieved (ALLSTAR, 2004). Airfoils, (wings and rotor