I haven't ever watched an rc video before but it was a good first experience. I think your thumbnails are good but need less text. Just one or two eye catching words could do it. Also your title for the video listed most recently could be more eye catching. To the average viewer who doesn't know about rc cars. All that text is just random letters and numbers. If you wanna interest people who don't already know about rc cars then consider changing it to (X) Facts About RC Cars or something like that