‡In 2003, an unmanned aerial vehicle preliminary design was done to be an environment warrior. The actual paper objective is to prove the flight capacity of the aircraft using experimental tools. For this reason, a test scale model was tested in a wind tunnel at diverse low Reynolds numbers. Then, using similitude analysis and finite elements correction, the lift coefficient and drag coefficient curves of the airplane could be drawn. These values will be necessary to calculate the performance and the dynamics loads over the airplane, one important step to achieve the structural design and to build its prototype.