All our dreams are intact and undiminished, the culmination of which is … What? No, we're not going to stop with just a mountainside cob village! There must be BIRDWINGS! Human Powered, 35-foot, High Tension, Flapping Birdwings! Of course, we’ll need a mountainside to take off from and as they say – “It takes a village to raise a child … on BIRDWINGS!”
“Sure,” you say, “That’s a nice juvenile fantasy, but it’s been tried and proven impossible. Man does not possess the muscle strength nor the lightness of bone structure to sustain flight with wings. Why, his pectoral muscles alone would need to be the size of car tires and even then he’d do no better than a turkey.”
“Yes,“ I answer, “but consider this: what size of -”
“Also,” you interrupt, “Leonardo DaVinci tried it with leg power and it still wasn’t enough. And if he couldn’t do it, do you really think you’re going to be able to?”
“Well, actually, my design incorporates the use of –“
“Plus,” you continue, “Science has come such a long way since DaVinci that surely SOMEbody would have found a way by now.”
I am silent now, biting my tongue, which tastes bitter. I stare awhile at your implacable cat-that-ate-the-canary smile then open my mouth …
“Actually,” you say, ”I saw this YouTube video where a Dutch guy made a pair of wings with flapping motors controlled by Nintendo Wii paddles that amplified his arm movements. He had one video of him flying with it, but a lot of experts said the whole thing was a hoax.”
“Aaaaaaaargh!!” I say.
“What?” you ask.
“Those wings, even if they ARE real, are NOT human powered, they’re human controlled! Flapping wings HAVE to be mechanical, NOT motorized!”
“Why?”
“Because everyone says it’s impossible!” I seem to be shouting a lot.
“But …” you seem genuinely puzzled, “It IS impossible.”
“Not if” I have my head in my hands, “You make the wings large enough to render the person’s weight negligible or even complementary to a balanced system of tension. “ I say quietly.
“How big would that be?”
“About 35 feet, is my guess.”
“How on Earth,” you demand, ”are you going to Flap wings that big?!”
“That’s where the tension comes in,”` I brighten, “In my design, force is only applied at the top of the stroke and the bottom of the stroke and tension does the rest of the work. Imagine holding a 3-foot tightly coiled spring horizontally by the center.”
“OK,” You are imagining.
“OK. When you move your arm up and down, what happens?”
“The spring bends and my skin gets pinched in the coils.”
“Ok, ok. Imagine it’s a thin 8-foot dowel of wood. What happens?”
“Hmm …” you muse. “The ends begin bouncing up and down.”
“Exactly!” I’m getting excited now, “And if you keep a steady rhythm you only have to move an increment at the top and bottom of the stroke and the bouncing ends flap harder and harder. The tension of the bent stick stores the energy expended and uses it in the opposite stroke!”
“My imaginary stick just snapped in half,” you lament.
“Very Funny” I say dryly. “Now watch this video on YouTube to see what I’m doing with this principle. I’ve not gotten far, but it’s a good start.”
“Ok,” you say, and you do.
“This,” I say when you return, “Is my dream hatching!”
“You’re going to need feathers,” you reply…