11 to 19% MAC. If at all possible, follow the plans. Try looking up your plane for plans and see if they are not on there. Looks like you have a Skyray or Goldberg equivalent, can't remember the name. Put the CG at 15 percent and try it, wait, if you've not flow before, put it at 11. It won't be very active at all but nose heavy planes fly again, tail heavy planes don't.