Aro 101 group write up

ARO 101 Group write up
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Unformatted text preview: ARO101A Sec 3 Introduction to Aerospace Engineering Plane Experiment AKA Operation Crash and Burn Wesley McGinn Jennifer Kurashige Jerome Magsino Thunyapoj Kijroongruangsri (JOE) November 22, 2006 Executive summary The purpose of this project is to use a model plane and fly it over a know course length in order to make calculations for: the lift coefficient C L , the drag coefficient C D , the power required for flight, and the lift-to-drag ratio L/D. This model plane was used to simulate actual aircraft flight so that we could get a hands on feel for what a plane does during flight. To calculate the C L we used the airspeeds (V ) on 15 lengths of the course in order to calculate the individual C L s and C D s for each course. Another task required was to graph the V 2 vs the C L . This project also was intended for us to use and develop some problem solving and team skills; as well as, help use to gain some general knowledge of the aerospace engineering field. From our data we found that on average our plane took about 6 seconds to fly the course of 140ft (42.672 m). We had an average C L of .694 which seems correct since the max is around ~1.0-1.5. When we initially tried flying the plane there was a fair amount of wind but, the later it got the less wind there was till there was practically none. We used that time frame so that we would not have to account for the wind speed. Throughout this project we kept in our minds how much error we each could be bringing into the equation while calculating various things. We knew that every time we crashed the plane might have more drag since it will have damaged or crumpled parts. Also our way of measuring the times is fairly inaccurate because its based on 2 peoples reaction times really, so that could account for the biggest problem. Another factor is whether it was a straight line each time. This will increase the time and thus throwing off our velocity each time and impacting pretty much all the calculations. We could minimize these type errors if we had a GPS or something of that sort on the plane or just launched each time further from our initial start distance and then just clocked the straight away and repeated it each time, granted this would take longer to setup but in the end it would eliminate more of the inaccuracy of the time measured. Discussion Modify this section and reword it NOT OURS the table is our data though In order to fulfill the objective of calculating the coefficient of lift for six trials, first we needed to understand the theory behind the coefficient of lift. The lift coefficient (C L ) is a number associated with a particular shape of an airfoil , and is incorporated in the lift equation to predict the lift force generated by a wing using this particular cross section. The equation for lift coefficient is equal to: In this equation, L is the lift force, ρ is the air density , V is the airspeed and A is area of the wing. The equation for dynamic pressure = q = ½ ρv...
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