Thus the higher the velocity of the flow the lower the pressure Air flowing

Thus the higher the velocity of the flow the lower

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Thus the higher the velocity of the flow, the lower the pressure. Air flowing over an airfoil will decrease in pressure. The pressure loss over the top surface is greater than that of the bottom surface. The result is a net pressure force in the upward direction. This pressure force is lift. Every physical body that is propelled through the air will experience resistance to the air flow. This resistance is called drag. Drag is the result of a number of physical conditions. Pressure drag is that which you feel when running on a windy day. The pressure of the wind in front of you is greater than the pressure of the wake behind you. A rough surface will induce more frictional drag than a smooth surface. To reduce viscous drag, aircraft manufacturers attempt to make contact surfaces as smooth as possible to reduce drag. Like lift, drag is proportional to dynamic pressure and the area on which it acts. The drag coefficient, analogous to the lift coefficient, is a measure of the amount of dynamic pressure gets converted into drag. Unlike the lift coefficient however, engineers usually design the drag coefficient to be as low as possible. Low drag coefficients are desirable because an aircraft's efficiency increases as drag decreases. 3 Experimental Apparatus and Procedures 8
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4 Presentation of Results 9
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5 Discussion of Results 10
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6 Conclusions and Recommendations 11
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7 Acknowledgements The authors would like to thank the RI Department of Education for providing the funds for conducting this experiment and for providing the necessary manuals on the equipment. 12
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Bibliography 13
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