Why won't it fly? Can you work it out?

Video Channel
Please help us to find bad videos. Broken or unappropriated video content?
After repairing the Volantex Ranger RC plane, Tim could not get it to fly. Exactly what was wrong? See if you can figure it out.
Ultimately, the solution was in some cheap "happy-face" tape placed on the wing at my suggestion. Who can explain why the happy-face tape suddenly fixed all the problems?
Fpvracer.lt is not the owner of this text/video/image/photo content, the real source of content is Youtube.com and user declared in this page publication as Youtube.com user, if you have any question about video removal, what was shared by open community, please contact Youtube.com directly or report bad/not working video links directly to video owner on Youtube.com. Removed video from Youtube.com will also be removed from here.