Most wingtip devices, including aerodynamic winglets, are designed to combat the "tip vortex" to minimize induced drag and improve an aircraft's efficiency, often by mimicking an increased wingspan.
True winglets, as conceptualized by Richard Whitcomb, function as "tipsails" by capturing energy from the spiraling air around the wingtip and converting it into a slight forward thrust, thereby improving fuel consumption.
The author's specific wingtip extensions, however, were added primarily to increase the "dihedral effect" of his homebuilt aircraft, enhancing its natural lateral stability and enabling more effective rudder-only steering, a purpose distinct from drag reduction.
Four years ago, I added wingtip extensions to my homebuilt. Originally, I had built the wing 20 inches shorter than its intended span of 35 feet, intending to add the tips after flight tests. I hoped to be able to adjust the dihedral with those little bits at the ends of the wings. It worked; but now many people who see them remark, “Ah, winglets!”
They’re not winglets.
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