Thank you, I really appreciate your nice comment.

I just watched a video on human powered ornithopter, and I wish they had seen your video, because their upstroke was so inefficient. I dream to ride in a small engine powered ornithopter, and I really believe that the feather angles you refer to are critical. I want to flap and glide, nice and easy, without the frenetic flapping of rc ornithopters. Be well, love from LA

kustomweb .

i know Im asking the wrong place but does any of you know a trick to log back into an instagram account..? I was dumb forgot my login password. I would love any help you can give me!

@Callum Emery instablaster :)

-Speed of gears -Elastic bands on the wing joints -real feathers -32x 180 degree joystick-like mechanisms (feather spread) -2 x180 degree joystick-like mechanisms (individual wing shrug) -triangle-point gears (circular roration) for wing shrug It would help if I knew what the bones were called.

Thank you for your visit to my channel and nice comment.

Thank you for your nice comment and visiting my channel.

Did you got it 7 years later? 😂

@@josepmavila2890 No, I did not.

@@mekanizmalar Damnit!

Thank you, I appreciate it.

Thank you for your visit and your nice comment.

Thank you for your nice comment.

+stop4stuff Thank you for your visit and nice comment.

Thank you for your support and encouraging comment. I would like to see your 3D print pictures of this if you do it.

Thanks. I learned a lot from KZfaq too.

Thank you for your visit and encouraging comment.

BEgendiginiz icin cok memnun oldum. Tesekurler.

extra air means extra charge (all matter recycles charge, ie real physical photons), i would say it does help lift.

Thank you for your visit to my channel and your comment.

+Cesar Marinho Thank you for visiting my channel and your very supportive comment.

Thank you for visiting my channel and your encouraging comment.

+Ilya Bedjkov Thank you for your nice comment. Some how I did not received emails for the comments about this video. Sorry for the late reply

Drar Joshua, thank you for your visit to my channel and nice comment.

actually - with the negative feather/***blue bird model (typo on previous comment), if wind pushes the bird to roll to one side, the downward wing will get air flow separation and stall, while the upward wing would get more lift. it would be very easy for the bird to go into an unrecoverable roll. evolution would not let such a thing happen :) thank you for this detailed mechanical animation.

I am glad that it helped.

I try to build one and I failed. Even Festo's bird does not fly like a bird.

Thanks for your nice comment.

Thank you for your visit. Forgive me for late reply. I am glad that you find what you are looking for.

Thank you for your visit and nice comment.

Thank you for your nice comment. The turning mechanism of the bird is combination of tail and the wings motions. I am planning to prepare a video about bird tail motions.

+mekanizmalar that's great.... it will be really helpful

Dear Regis, I agree with you that bird flight is very complex phenomenon. For example while Gulls flap their wing much simpler up and down stroke, the Hummingbird flight is more complex, more like insects than birds. Also I now the expression "According to aerodynamics principles, bumble bee should not fly, but bumble bee does not know aerodynamics and that is why it flies." I also know effects of ring vortex on flight, because it was part of my PhD thesis. In my animation I just wanted to emphasize importance of feather in the flight. Opening and closing of feathers are important portion of flight but there are many arrangement in birds body which makes it perfect creature for the flight. However, if there were no feathers birds could not be supreme flier. Nature invented many organs for different creatures in many form and shapes. But it invented the feathers only once.

@@mekanizmalar Totally agree on "many organs", not so much on feathers. I suspect the variety in feathers in shape and size make it a set of principles, not a single "invention". Now, from the efficiency point of view (we're talking dissipated energy here), birds are not the supreme fliers, not evel the owls (the very impressive silence of the flight suggests no energy is lost, but it doesn't make it the most efficient yet), it's well known to be the bat, no question about it. It's a mammal (egg layers are proven to be on the complete other side of evolution) and there are no feathers. Now, I'm amazed with your explanations on the orientation of feathers, and I'm trying to think of a(theoretical) way to implement it in an ornithopter-style thing. How would you make sure to be fully-open on the upward stroke and fully closed on the downward stroke (simplifying a lot, sorry)? Would you rely on gravity alone (that involves more weight, right?), or slats with a concave face down/convex face up, or even weak-enough springs (requires more torque to open the slats)? Did you go further at some stage and made a real-world model of this principle? All ornithopter models I can find on KZfaq use a simple thin plastic layer (likely LDPE) and only rely on the movement of the wings to fly.

Thanks for your visit and comment. I use Adobe Flash for my animations.

Thank you for your encouraging comment.

Yes. This is the key. I’m also curious to know.

In one complete cycle, up and down, red bird generate more lift during take of than the blue bird, since it fills underside of its body with fresh air, while the blue bird does not. During the cruising flight generate same amount of lift, however blue bird experience more drag. This is because the red bird directs the air particles to fill the vacuum behind it, while the blue bird does repels the air particles outward, which causes more drag. In short, the red bird creates more lift during take of and less drag during cruising flight, while the blue bird creates less lift and more drag respectively.

Benim icin bunu yapmak bir zevkti. Begendiginiz icin tesekur ederim.

I know that birds have extraordinary capabilities to control features. However, I do not know whether they handle flight feathers or not. Since the feater shaft is oof center, enough for opening and closing gabs between feathers.

+O Okba Didn't I mention similar stuff in my video?

nope

Bird flight is a very complex task. I guess birds use their tails to accomplish right or left rotation by just arranging their tail angle accordingly. However, I see birds change direction without a tail. I think they use their wings to do that. However, the tail gives the bird more control to make a turn.

@@seyhanersoy8989 Thanks for reply. Yes, majority of birds might use tail for left or right or use a small portion of their wings to create just enough drag to turn. I find it interesting how a bird doesn’t have the need for the use of a tail like a plane uses to fly straight. Planes do use a elevator section if it’s tail to move up or downward but a bird doesn’t technically have a vertical back tail. Maybe it’s a Birds tail is dual usage like a bonanzas V-Tail combines both elevator & rudder in one area.

Thank you.

Trevor thank you for your visit and comment. I guess this is more difficult to build than regular ornithopter. I am not good designer, I tried it once and failed to build it. I am looking forward someone more experienced in the design and do it.

You're welcome. Thank you for the presentation and the knowledge shared. Generally yes, I suppose it would be more difficult than a regular design, but I think the potential exists. I've no experience in the matter myself though.

Thank you for your visit and comment. Both blue and red bird can fly.. However, takeoff from ground would be very hard for the blue bird. Cruising flight for blue bird would be very inefficient. in short, the chances of the blue bird competing with the red bird would be slim.

Thanks.

+Robo LOUtchinco my email is mekanizmalar at gmail dot com

As far as I know Otto Lilienthal who is considered as the father of gliders done extensive research on the bird flight. My animation based on an image from his book. However feather arrangements in that image was wrong. I am sure an artist rendered image wrong and Lilienthal did not pay attention to that small detail. In short I may say that it was Lilienthal who first studied the subject scientifically. However I do not know who noticed feather arrangement first. Even some old roman eagle figures show correct feather arrangements.

well, im in the business of hybrid batsuits ... type in "ornithopter with feather arrangement" and see what i mean about how i guess were a ways off from civilian development.. lol, your video does come up tho

Dear Amit, Bigger the bird, slower it is wing flapping and visa versa. Therefore the small birds flap their wing faster. This means that wing feather opening, closing will be much faster. In short air will pass true in between feathers during upstroke. As long as shaft of feather wing are off center, this event will be true.

Thanks

Birds use their tails to change direction, however it is not whole story, it is also may use their wings for maneuver.

+mekanizmalar Thanks.

I think that the bird flight is more complicated than an airplane flight. For example I spent five years of my life to do computational simulation of aircraft wing tip vortices during my PhD thesis. Same phenomenon explains why birds fly in V formation. I do not know which part of bird flight you are going to concentrate? Gliding, taking-off, landing, hovering and wing flapping? All of them are important and most people think that birds fly just like airplanes. But, the bird flight much complicated than that. Bird can land and take off from one spot by not consuming a lot of energy. Harrier, jets do that, but amount of energy is a lot.

I want to perform the aerodynamic analysis of the wing flapping. so its a condition of moving boundary mesh.

I want to perform the aerodynamic analysis during take off and flapping. so can you please suggest me how to do so?

What you are describing is very complex analysis. I really don't know where to start. I am not following new developments in CFD field almost 24 years.

sir can you send me soft copy of your phd thesis? It would be very helpful. My mail id is biswajit346@gmail.com

Adobe Flash

@@mekanizmalar thanks sir

+Charan Jaan Thank you for your visit and encouraging comment.

Dear Eugene, thank you your visit my channel and your comment. I do not believe that the bird winds, especially, large birds wing not just act as an airfoil. In the air plains jet engine or propeller crates a thrust, so that air plain can fly. Air plain wings always laying down, but they will never fly without thrust. Bird wings and feather are very elegant solutions to the flight. No flaying animal whether its a bat or insects can escape being a pray to the birds. Because their flight mechanism is much superior. I suggest you should read the book Otto Lilienthal father of gliders write about birds. Bird-flight as the Basis of Aviation.

Ben Amerikada yasiyorum.

ben niye burdayım bilmiyorum ama hello

Thank you for your visit to my channel. I don't think that man could fly with wings no matter how large it is. Huge extinct flying reptiles have a weight almost equal to human weight but they were like small airplanes. Also they have small brain, hallow bones and small leg. If we want to fly like them we should have a bird brain flimsy legs. I am happy with my brain and leg size. I rather fly like a bird with flying machines humans invented.

@@mekanizmalar I wonder if large eagles can carry ships, so for average human weight birds have to be not much bigger than condor with wingspan about 3-5 metres...

@@thelostgeneration2000 Do you mean Sheep. I guess that sheep will be difficult for eagles to carry. They drag the sheep over the cliff and let it go down. When the sheep die, they will consume the carcass as much as they can.