It now uses two to the blade pitch t spaced congruent streamlines out, which values Ψ and Ψ+∆Ψ the current function meet, as can be achieved by these power lines and the lines 1 and 2, a control contour ABCD (form. Longitudinal is this the circulation Γ to the individual blade readily determinable because shares along the lines Ψ and Ψ+∆Ψ became a burden themselves formed clockwise she is positive and amounts to: