Who hasnt noticed that most new airplanes out there today have 'winglets' attaced to the end of the wings? Some older planes are even being equipped with blended winglet technology. The result is less drag, more effiecient airflow,= less fuel burn.

If we subcribe that a sail is a wing, why not put winglets on top of the mast (some winglets extend both directions, up and down such as the A330). Would you not get the same result? Less Drag, more streamlined airflow?

Has this been tried, attempted, or is it nonsence?

Michael