And the Interesting Wing Tip of the Year Award Goes to...

Wittman Buttercup N676JS!

Over the years designers and experimenters have tried a wide variety of different wing tip concepts to try to minimize the aerodynamic losses caused by the tip vortices that shed of the end of a lifting wing. A good wing tip can recover some of the energy lost to the vortex, reducing induced drag and increasing rate of climb and cruise efficiency. N676JS shows 2 iterations of this quest.

The highly-tapered tip was originally developed by Steve Wittman to improve the performance of the Tailwind. The concept also proved to be helpful to the Buttercup.

On 6JS, the builder hat tried to take it a step further with the highly curved and upswept extensions shown here. The jury is still out as the whether they produce a useful performance e improvement, but they are certainly an example of the spirit of continuous experimentation and the quest for ever-better ways to build airplanes that is at the heart of EAA and the experimental aircraft movement.

7 Replies to “And the Interesting Wing Tip of the Year Award Goes to...”

  1. Greg, do you iron your sheets?

    Thanks for your comments Barnaby, you are always a good read.

  2. I always enjoy seeing continuing experimentation.
    On the wingtip design topic, though, I never see in these articles or on the flight-line, the "Finch Tip", designed by Richard F. Finch, aeronautical engineer (now deceased, I fear). This tip specifically is designed to "untwist" the wingtip vortex

  3. @Merle's comment.

    I was curious to see the wingtip profile you mentioned. designer have I found is Reginald Vernon Finch. Google ininventor:"Reginald Vernon Finch"

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