NASA Incorrect Lift Theories

Added on - 28 May 2020

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NASA Incorrect lift theoriesName:Course:Professor:Date:
NASA Incorrect lift theoriesNASA incorrect TheoriesAbstractDifferent authors have different explanations of the lift theory. The different theoriesdeveloped are therefore able to confuse learners on which they have to believe and use whileexplaining the lifts. It is important therefore to identify the areas where the different theoriesare able to represent false information (Bloor, 2011). This paper will identify the NASAincorrect lift theories and highlight the false information in the specific theories. Theidentification of the false information will be compared with what is explained in theguide 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 longerthan the bottom part (Nicolosi et al., 2017). This helps the air molecules in the upper part tomove faster in order to meet the air molecules at the bottom part at the tail distance. Thiscreates lower pressure at the top and therefore enhancing the lifting of the airfoil.According to Bernoulli’s equation;
NASA Incorrect lift theoriesAtVt=AbVbIncreasing the distance in the upper area increases the area and therefore the airmolecules need to move at higher speed for the equation to balance. One of the incorrectparts 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 paperairplane will fly fine. This explains that the distance is not the main cause of the lifting forcebut the flow turning. Another incorrect part is that the upper air molecules move faster thanthe bottom ones. Conducting an experiment on flow shows that the flow on lower part movesfaster than on top. In addition, it is clear that the air molecules at the beginning will not bearranged the same at the tail. TheGuide to Aerodynamicsagreed on the Bernoulli’s effect onairfoil but does not hold on the highlighted incorrect information.The second incorrect theory is known as “Skipping Stone” Theory. The theory holdsthat 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 notconsidered anywhere yet is has air molecules striking (McLean, 2013). It can therefore beassumed that airfoils with equal bottom area but different top area will have the same liftingforce 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 fluidwhich affect the lift force. TheGuide to Aerodynamicsholds that this theory is only trueunder high speed and attitude.
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