My 8-year-old grandson will be visiting. I'd like to get an rc airplane (readymade) for us to fly together. My plan is to get it in advance, teach myself how to use it, and then teach him. (I've never flown rc models). I saw a couple in a toy store, "Air _____something-or-other" . They looked pretty cheap -- price and quality both. One two-engine model, one wing, was $39.99. The other, a dual engine biplane, was $42.99. Do these things really work? Work well? Other suggestions? Many thanks.