If its your first EDF, why go to the trouble of designing your own? I took the FT-22 and modified it to use a 70MM EDF in place of the slot prop and it flew amazingly well. Just a tip though the thrust tube is critical, length 1.5 times the diameter and tapered 2/3 of fan diameter,(I used a red solo cup,(Dixie) with the end cut out as mine and it was sweet till the end. See "lessons learned" forum "fly the plane" post. lol