Are you asking about wing extensions? or the form of the wing tips? I understand the Free Bird is supposed to have a slightly longer wingspan - better load and lower stall would be my expected outcome.
There are some great designs to help calm the vortex at the end. Mind you some really do not earn you much other than cool points until you are +200 kts.. https://www.kitplanes.com/design-process-wingtips/ [https://s28490.pcdn.co/wp-content/uploads/2021/10/IMG_1924.jpg.optimal.jpg]<https://www.kitplanes.com/design-process-wingtips/> Design Process: Wingtips - KITPLANES<https://www.kitplanes.com/design-process-wingtips/> Barnaby Wainfan is a principal aerodynamics engineer for Northrop Grumman’s Advanced Design organization. A private pilot with single engine and glider ratings, Barnaby has been involved in the design of unconventional airplanes including canards, joined wings, flying wings and some too strange to fall into any known category. www.kitplanes.com https://www.boeing.com/commercial/737max/737-max-winglets/ Boeing: The most efficient winglet on any airplane<https://www.boeing.com/commercial/737max/737-max-winglets/> Boeing is introducing the very latest in advanced winglet technology, the 737 MAX AT Winglet. In addition to the inward, upward and slightly forward lift components of the upper aerofoil, the new lower aerofoil generates a vertical lift component that is vectored away from the fuselage, and also slightly forward. www.boeing.com I am not a fan of droop wing tips on high wings due to the loss of view. Our KR planes we can get as exotic as we want without compromising. Mind you - any changes should be done GRADUALLY - as if you put a big ole honking wingtip, you SHOULD expect changes! (but they might not be in the flying characteristics that you were looking for!) M. ________________________________ From: KRnet <krnet-boun...@list.krnet.org> on behalf of Gary Sack via KRnet <krnet@list.krnet.org> Sent: Tuesday, November 22, 2022 11:32 PM To: KRnet <KRnet@list.krnet.org> Cc: Gary Sack <garys...@gmail.com> Subject: KRnet> Winglets How about a new subject, or perhaps an old one revisited. I have always felt 81JM is span limited (though she sure fits into a crowded hanger nicely). Has anyone put winglets on a KR? Did it improve efficiency or low speed performance? Do they have to be "just right" or will flat plates help? How big for a first try? Or should I leave a great plane as is?
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