I test flew one of these for a friend… To trim for level flight at about medium power was around 20% down elevator. It just looks odd to have that much down, so we unwisely re-centered it for the second flight… shot up and had to use a ton of down trim again. If you fly it at one throttle setting, it is ok, but then that pesky part about landing comes up…. Reduce or increase throttle and you have a roller coaster. Good times….not.