Whats the difference between the Monarch D airfoil and the Chrysalis?
From : Don Stackhouse Adam, I can’t answer this one directly because there is no SINGLE airfoil for the wing of either model, nor should there be. The section requirements vary along the span, and with changes in flight condition. For certain flight conditions the freestream airflow is not even uniform over the entire model. For optimum performance, different airfoils are required for different parts of the wing, even for so-called “uniform” or “constant lift coefficient” planforms such as the ellipse. For example, in level flight the Reynolds number near the tip of the Chrysalis wing is less than half the Reynolds number at the root. In a turn, the Reynolds number at one tip can be considerably different from the other tip’s, not to mention the lift coefficients and angles of attack! We therefore vary the airfoils, chord and twist along the wing to match the local requirements. The only reason we even publicly give names to any of the airfoils we use is because most of the sailplane f
