English: The figure shows the Velocities and Blade Forces for the Flow across the element 'dr'.
1. 'w' is the Mean Velocity at a direction β from Axial direction.
2. ΔL = Lift Force (Perpendicular to 'w') and ΔD = Drag Force (Parallel to 'w').
3. The Axial and Tangential forces are ΔFx and ΔFy respectively.
4. The Resultant force 'ΔFr' is at an angle Φ to the Lift.
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