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Thanks, This is a very nice summary of an complicated report.... Just what I needed. As I see it's no idea to put energy in develope an nice looking winglet. I rather stay with the original wingtip..... This takes me to the next level: Anyone have an original wingtip nut cutted as delivered from Lancair ? Antother question is: I think the wingtip was pretty heavy ? Is it any idea to mold in plastic or thinner carbon as material. Please gents let me know about anyone have interest in premade LED lights. Best regards Roger Iverin On 2013-08-26 19:28, Chris Zavatson wrote: Roger, Winglets are effective at high lift coefficients. They add some parasitic losses while reducing induced drag. For this trade to make any sense however one needs to be operating at a lift coefficient that produces significant induced drag. In the 320/360 most operation is at a CL between 0.2 and 0.3. The link below is to a paper showing the effects of winglets on a Bonanza. The cross over point was at a CL of 0.3. For us to cruise and greater than 0.3 we would need to fly really high and really heavy. I am assuming WOT here. Part throttle will allow for higher lift coefficients. If you are trying to maximize range at the expense of top speed winglets could be useful. The big boys flying at 30-40k do operate at high lift coefficient that make winglets effective in cruise. http://n91cz.com/Interesting_Technical_Reports/NASA_TM81892.pdf [1] Chris Zavatson N91CZ 360std http://www.n91cz.net/ [2] FROM: Roger Iverin <roger@iverin.com> TO: lml@lancaironline.net SENT: Monday, August 26, 2013 5:02 AM SUBJECT: [LML] Winglets/lighting. Gents, I'm in the progress getting made modern led lighting for the 320/360. In this progress I also trying figure out the effect of winglets. I have seen pictures of 320/360 with winglets. But I would like to know about the performance changes. In both this I would like to buy or borrow wintips as delivered with KIT. (making a mold) NOT anything done, sanded or anything to make sure it's as original as possible. I have already wingtips, but they cutted for lenses. Regards the lighting I'm trying to get a kind of cofoundig for the first ones. This is the company and the inspiration: http://www.aveoengineering.com/index.php/products-1/custom-projects/conforma-ziptips-for-vans-and-f-1-rocket [3] But I'm open for all options. Please share with me your ligting ideas and winglets experince. Please contact me on list or off list! Best regards Roger Iverin -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html [4] Links: ------ [1] http://n91cz.com/Interesting_Technical_Reports/NASA_TM81892.pdf [2] http://www.n91cz.net/ [3] http://www.aveoengineering.com/index.php/products-1/custom-projects/conforma-ziptips-for-vans-and-f-1-rocket [4] http://mail.lancaironline.net:81/lists/lml/List.html