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NASA Incorrect Lift Theories

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Added on  2020-05-28

NASA Incorrect Lift Theories

   Added on 2020-05-28

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NASA Incorrect Lift Theories_1
NASA Incorrect lift theories NASA incorrect TheoriesAbstractDifferent authors have different explanations of the lift theory. The different theories developed are therefore able to confuse learners on which they have to believe and use while explaining the lifts. It is important therefore to identify the areas where the different theories are able to represent false information (Bloor, 2011). This paper will identify the NASA incorrect lift theories and highlight the false information in the specific theories. The identification of the false information will be compared with what is explained in the guide toAerodynamics.The first incorrect theory is known as the “Longer Path” or “Equal Transits” Theory. It related to the Bernoulli’s effect. The theory explains that the top of airfoil is made longer than the bottom part (Nicolosi et al., 2017). This helps the air molecules in the upper part to move faster in order to meet the air molecules at the bottom part at the tail distance. This creates lower pressure at the top and therefore enhancing the lifting of the airfoil. According to Bernoulli’s equation;
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NASA Incorrect lift theories AtVt=AbVbIncreasing the distance in the upper area increases the area and therefore the air molecules need to move at higher speed for the equation to balance. One of the incorrect parts about this theory is the effect of the distance to affect the lifting of the airfoil (McLean, 2013). Taking for instance a paper airfoil of equal distance on top and bottom, the paper airplane will fly fine. This explains that the distance is not the main cause of the lifting force but the flow turning. Another incorrect part is that the upper air molecules move faster than the bottom ones. Conducting an experiment on flow shows that the flow on lower part moves faster than on top. In addition, it is clear that the air molecules at the beginning will not be arranged the same at the tail. The Guide to Aerodynamics agreed on the Bernoulli’s effect on airfoil but does not hold on the highlighted incorrect information. The second incorrect theory is known as “Skipping Stone” Theory. The theory holds that the lift is created by reaction force of air molecules striking the bottom part of airfoil. One of the incorrect information about this theory is that the upper part of foil is not considered anywhere yet is has air molecules striking (McLean, 2013). It can therefore be assumed that airfoils with equal bottom area but different top area will have the same lifting force which is not true. The theory does not explain the effect of air molecule interaction withthe upper part. This is because the top position is not a vacuum and has air molecules strikingas well. In addition, the theory does not address the effects of physical properties of the fluid which affect the lift force. The Guide to Aerodynamics holds that this theory is only true under high speed and attitude.
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