WIND TUNNEL EXPERIMENTS ON THE MODEL OF THE YUGOSLAV "WORLD CLASS'' GLIDER
AbstractLimited experimental results of wind tunnel tests for the Yugoslav "World Class" glider are presented. The experimental work was accomplished in the wind tunnel of Aeronautical Institute of Belgrade. The obtained results show good agreement with the theoretical results. In particular, the values of maximum lift coefficient as well as the slope of lift coefficient vs. angle of attack curves agree quite well with the theoretical results. The lift-to-drag ratio and speed polar within a wide range of velocities show better results than the calculated results. The effect of airbrakes was also investigated and the experimental data show better results than the theoretical ones. The experimental data obtained for a range of low angle of attack shows a larger discrepancy in comparison with the theoretical data. The probable causes are boundary layer and 3D effects along with the impossibility of measuring small values of desired parameters.
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