A FLIGHT INVESTIGATION OF PROFILE DRAG MEASUREMENTS
MISSISSIPPI STATE UNIV MISSISSIPPI STATE
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The integrating wake rake is commonly used in the United States for the determination of the profile drags of airfoils in flight. The use of the integrating wake rake by the author to determine section profile drags in flight brought to light a number of inaccuracies which prompted a detailed study into profile drag measurements. Profile drags were measured on two very different airfoil sections in flight using both the integrating wake rake and a transversing Pitot-static system. A direct comparison of the two methods was made and possible explanations for the differences presented. The tests were performed on a Schweitzer TG 3 sailplane which had a fiberglass low-drag glove section fitted to the port wing and on the starboard wing a rather unusual leading edge section which was used for laminar separation bubble investigation.