ASE 167M - Lab 3 - ASE 167M Lab #3: Aircraft Stall Drew...

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ASE 167M Lab #3: Aircraft Stall Drew Rosecrans March 23, 2010 Abstract The focus of this lab was to see the effects that flaps, landing gear, and gross weight have on an aircrafts stall speed. We recorded the airspeeds at which stall occurred for different scenarios. A trend was found that as more flaps were put down the stall speed decreased. Also it was found that the more gross weight that an airplane had the higher its stall speed. It was less obvious with the landing gear scenario. It could to some extent be seen that with the landing gear down the stall speed was increased slightly as opposed to it up. 1 Objectives 1. Explain the cause of aircraft stall in writing. 2. Explain the effects of flap settings and landing gear position on the stall speed of an aircraft. 3. Explain the effect of gross weight on the stall speed of an aircraft. 2 Discussion Airplanes of course must have a certain airspeed to maintain flight. The airflow over the wing is what produces lift, but there are certain things that can happen to make an airplane lose lift and go into a stall. Looking at the equation of lift shows us that can happen to lose lift. = L 12ρV2ClS So for a given air density and wing area there are two things that can make an airplane lose lift. One is the airspeed, V, gets too low, and the other is that the coefficient of lift, Cl , drops off. The coefficient of lift drops off when the angle of attack, α, becomes too great. The angle of attack is the angle that is made between the velocity vector and the chord line of the wing, as shown in figure 1. Cl is a linear function of α for the most part, until the stall region. At the stall region Cl drops off drastically.
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Figure 1 Flaps are used to increase the Cl . The more they are put down, the more they increase the
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This note was uploaded on 09/18/2011 for the course ASE 167M taught by Professor Staff during the Spring '10 term at University of Texas at Austin.

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ASE 167M - Lab 3 - ASE 167M Lab #3: Aircraft Stall Drew...

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