How birds fly ?

Birds fly . Birds flap their wings and generate necessary lift for flying .

How this lift is generated ?

Is it aerofoil theory or some other mechanism ?

 

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http://www.google.com/url?sa=t&rct=...t7nGAw&usg=AFQjCNF3lwfJSOBA9gj_YvNY-yg0YlCxRQ

 

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Thanks .

 

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Is there any wing (designed) ; which can generate lift through flapping mechanism , like the birds wing ?

 

I've seen electric powered remote controlled model birds fly. They didn't fly great, but they did work and looked pretty neat in the air. A lot of mechanisim involved.

 

http://www.google.com/url?sa=t&rct=...0Z2KDw&usg=AFQjCNGtCnboS6h8F1lAmmsDYEjYP9gPpw

 

I'm glad someone brought this up. How about bees? Back when I was a boy and Shep was a pup, pseudo-intellectual laymen were always going on about how according to scientists, and especially the most reprehensible kind of all - the mathematician, bees should not (can't) fly. So have they figured out the flight of the bumblebee yet? Because, clearly bees do fly.

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When they were making this naive statement, they were calculating the lift as if it were a fixed-wing design. Insects flap their wings in a figure 8, which produces a different kind of lift than man-made fixed-wing craft.

That old wives tale goes in the same bin as 'humans only use 20% of their brains'.

 

Can you tell me, where these birds are available. I have developed a flapping mechanism and want to try with their wings.

 

http://www.birdkit.com/

 

birds fly by generating low pressure on top of wing and high pressure on bottom of wing, through air vortexes.

If you want a good ornithopter, than consider buying this one: http://www.libertygadgets.com/index...id=256&zenid=2a3d63b7bab857ab771be2db9c735eb7

 

Grumpy, Youreyes :

Thanks for your informations.

 

maybe you missed it F.R. but the O.P said "fly".

 

Just for the sake of curiosity, what principle is followed by other flying creatures like bat, butterfly, fly etc?

Is it also vortex principle like birds'?

 

I had very good (graduate level) course in aerodynamic, even though it was in my experimental 5-year undergraduate program at Cornell. I have forgotten 95% of what I learned in it, but do remember there are two entirely different (but agreeing) ways to mathematically describe simple flying of an airplane wing. One centers on the linear momentum downward (given by the wing) to continuously form, in static air, the vortices left behind with the "equal and opposite" upward reaction force on the wing. The other is a little more straight forward to understand. It is based on Bernouli´s principle (speed air flow up and its pressure drops to conserve total energy in the air.) To travel the longer path over the top of the wing the air must go faster than to travel the shorter flat path along the bottom of the wing so pressure on top is less. Not a word about vorticies in this POV. - Neither POV is more "true" than the other.

BTW, in warm weather I sometimes take shower with my cocktail (Sunshine by name). The shower stall is small and she can fly essentially straight up the glass door from my hand, without touching it, and over the top (perhaps only before her wigs get too wet, I forget.) The door is about a foot in front of me so it is a very narrow channel she is rising up at least two feet in. She may be using glass door somehow for "ground effect."* But in an open room she can climb up only 30 degrees off vertical. She is very strong - flies when ever she likes thru the entire apartment. - She only sleeps in her cage at night or when we go out.

*I.e. is doing to the air with her wings what she does to fly up 30 degrees off the vertical, but that is making air pressure between herself and the door which also acts on her, so flight path is vertical.

 

Moving from air to water:

I believe most of the aquatic species(like fishes) gain their locomotive power from flapping of fins. Is this flapping mechanism same as flapping of birds(vortex principle) or flapping mechanism of fishes follow action-reaction principle of Newton's Law?

 

Actually, this mode of "flight" is speculated to be a step on the evolution of flight. It is known that small dinosaurs had feathers, originally for insulation, but it is speculated that pre-avians used a wing-like arrangement to improve their speed and maneuverability while running. Obviously, the evolution to augmented jumps and on to sustained flight is not far.

Hans