I am retired 68 and I like to think I'm a reasonable engineer. I have many interests, a major one is aircraft both the 'real ones' and model aircraft which are simply smaller versions of the full size however, model aircraft are not toys, you push toy aircraft around on the carpet and make silly aeroplane noises. Model aircraft are governed by the same principles and laws of physics as the real thing. If this were not true, they wouldn't fly.