So I've been making an F-35 Replica(that looks really horrible) and i wanted to see if it would fly. I checked the COL and COM and the COL was all the way on the floor. (I tried to test fly it but it didn't take off and flipped out)
Picture: http://imgur.com/a/eBbtV
EDIT: It''s a little hard to see. The COL is below the plane on the floor.