With the 8 foot wingspan, and weighing less than 10 ounces, the aspect ratio is off the charts !! Experienced Rev flyers love the amazing control, and the Eagle Glide in very light winds. We give a wind range of zero to about 14 mph. The structure is a 5/16” Reflex shaft in the 3 piece Leading edge, and ¼” Race shafts for the verticals.