I've been wondering why machines like this never seem to produce enough lift...
Could it be that maybe there is more to airborne flight, than simply the mechanical motion of the wings flapping?
Perhaps birds use electromagnetic levitation of some sort, in order to fly?
This book, The Secret of Life helps to confirm my suspicions.
Go to the chapter: Auto-Electrification in Living Beings.
At this new altitude the bird will find in the atmosphere an electric tension which, added to that generated by the friction of it's wings against the wind, will give it the tension of 75,000 volts which is both sufficient and necessary for continuing it's flight.
In other words, birds need electric tension in order to fly!
Aaron Dover also did an interesting video on this topic.
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