newbe here so be easy...im building a twin edf f18..i have been building for years,but not alot of flying...so heres my question..if i run a single tanic 3250 4s pack..do i need to run a bec..i have been told no,but i want to get some more imput..anyways...the amp draw is 27 amps per fan, and the pack is 20c continus,so the pack has enough juice..thanks alot..stumpy