I am in the process of building a c-5 galaxy. I am going to power it with EDF's 4 of them to be exact. The finished in air weight will be around 15-20 pounds tops. it has a 95 inch wingspan and 95 inch fuselage built out of blue insalation foam and sheeted with balsa. I would like to keep my fan size no bigger than 90mm. I looked at the eflite airliner motors with 70mm fan 3500kv motor with 4s battery and that is a joke. 4 motors of that type acording to the internet will give me a combined thrust of about 6.5 pounds. Any help would be great.