Been flying some past 2 yrs with X650F quad with extended motor mounts . . .home built. Just bought a P4 and trying to decide what ipad screen to use. iphone 5s works I guess but at least a mini2 . . .do I need the bigger screen? . . . Hope to do something useful with either one if I can get approved for SFOC. . . required around built up areas and EVERYTHING here is inside a local airport control zone . . P4 is over 2kg and my X650 is 2.5kg. . . fun!