The dominant cause for fatalities in kit planes I've reviewed, is low & slow while: making turns, abrupt control movements, high engine power, wind gusting or wind drop-out near stall speed. http://www.ntsb.gov/investigations/accidentreports/pages/aviation.aspx For conventional gear / tail draggers, the center of gravity is behind the landing wheels, contributing to a tendency to want to ground loop. The Sportsman STOL Kit will not allow a stall, just about in any attitude and power setting. Also in some PiReps there are reports of a more stable landing after touchdown due to the Sportsman STOL Kit and increased control surface authority. Created a related Group: https://www.homebuiltairplanes.com/forums/group.php?groupid=39 I did not originally build my Kitfox. By what procedures am I required to follow, to make untested changes to my aircraft? and Does anyone have experience with a Sportsman STOL Kit in a certified aircraft, or better, in a HBA?