Dear Bob – you are very clearly of the fixed plank mindset – and that is fine – but I think we would all agree that birds are the finest flyers on the planet and most of them do zero speed landings from Eagles to Tits. (Calm down). You may also have noticed that the wings of birds are made up of hundreds and hundreds of moving parts that all seem to hinge in harmony to achieve both forward flight and all the uppy downy bits in between. I seem to recall that plank wings that you favour have all the sophistication of a slab of balsa with traily bits stuck on the rear.(Calm down sailor).
I will agree that the hundreds and hundreds of bits in a helicopter hardly seem to work in harmony but most of the time whatever they do is fine by me if it keeps me airborne. The less you know about how it works is a huge stress reliever!