I did not want to get involved in this issue but your statement Drew is absolutely untrue, (Jack and company, me ,myself and I) did exactly as Mark suggested and sent to me. I wish that people would not comment on issues which they no nothing about. I sent my drawings to Mark in 2005 about the blended winglets ( I will post a copy of the original drawing as soon as possible). I weighed blending the winglet already attached to the wing, which are what Mark drew up for me and has on his wed site and was also on the forum. I did not like this process and decided to go with the new winglets with the extension or continuation of the wing shear web and spar cap to the top of the winglet, my design. Mark furnished the techinical information for the proper layups for structural strength, period. I do not recall ever mentioning the size of the radius of the blend but if you look at the original drawing I sent to Mark, the12 inch radius is not accurate. A 12 inch (circumference) is closer to the blend on my winglet, actually the outside of the radius came out to 13.5 inches, the inside 6 inches is circumference, not diameter. This is the blended winglet I designed and installed on my E Racer. I tested the AC in all attitudes and they performed almost exactly as I hoped they would. I alone decided how large the circumference during my design process to keep the bottom of the rudder as low as possible, the larger the blend, the higher the bottom of the rudder is. I also designed all the linkage, a very simple system. I will post the drawing as soon as I figure out how to attach to the web site. I have the right winglet with a portion of the wing saved from E Racer113 and in the near future will test the actual strength of the blended winglet as I designed. I will do a professional video of the actual test, outside to limits and inside to destruction.I will send this video to Mark for what ever he wishes to do with it. Mark was a tremendous help in this program and I would have never attempted this on my own. I wasn't born yesterday but techenical and structural knowledge is a must with a serious modification like the blended winglet. Just setting the record straight.
Jack