hi guys, just had to bounce in here.. i fabricated and installed Vortex generators on my Bud Nosen citabria and they work great.. i made them out of Lexan left over from my new windows,, and i can tell you the difference is very noticeable. she will just hang in the air now with out stalling, and when i force a stall, i still have aileron control though the stall. i looked up Vortex generators and found several sites with the formula for spacing and placement and multiplied by .25 to get what i needed for 1/4 scale.. to give you an idea, i crashed this plane because it had a very nasty habit of snapping into a spin if she stalled ( i mean she would flip onto her back right now, and do at least 2 uncontrolled spins) now, with the vortex generators there is no tendency at all to stall. i can land her every time on the tail wheel.. i will try to attach some pics ( by the way, i only put them in front of the ailerons, so the root would stall first)