Thanks Art,
I downloaded those LMA guidelines, and will check the MAC this morning. Actually I will be using a single Dyn e max fan or possible an extreme models Ramtec fan which will be fully ducted. I will start out at 12s , based on the performance I saw on Jim Drew's edf Yellow F-15. He has been instrumental in helping me develop my plugs for the ducting. Another fellow,
did one of these a couple years ago , using the stock stab arrangement, and reported flutter on his test flights at fullpower. Thus I am trying to head that off on my development. I am probably over building my stabs (adding too much weight to them). I have cut off the trailing edge foam and added balsa trailing and leading edges. the leading edge balsa also has a thin strip of carbon fiber between it and the foam. Once I determine the pivot point, I will notch into the foam and add a piece of spruce for the control pivot rod to be installed into. And then glass the assy with lite glass cloth. Hopefully I can over come that weight with the batteries up front.