It is proposed that a model study be carried out on a proposallow-speed airfoil that is to fly at low altitudes at a speed of 50m/s. If a 1:10 scale model is to be constructed, what velocityshould be used in a wind tunnel? Comment as to the advisability ofsuch a test. Would it be more advisable to perform the test in a20?C water channel? If a water channel study were undertaken,calculate the drag ratio between the model and prototype.
