I took my bf Aron to play mini-golf and took him out to dinner afterwards. Then he gave me a b j and we snowballed.

There are some aircraft whose wings flap like the wings of birds. They're called 'ornithopters'. They are, however, experimental aircraft, for the very simple reason that when designing something to fly through the air, humans don't have the same limitations as evolution does. In other words, we can play with different ideas on paper and with models before we commit to the real world.

I agree with some parts of various answers above. To really understand how birds gain lift and propel themselves forwards, you need a sound knowledge of aerodynamics. But if you want the short version, it's like the idea of sculling or paddling in water.

A bird's wings generates lift as well as thrust through a quite complicated sequence of motions. Look closely at a bird next time one flies past you, or better still, seek out some nature show that features a flying bird in slow motion. It's not just a simple up-and-down action; at different times when the wing is moving forwards, downwards, towards the rear and back up again, it is generating different proportions of lift and thrust. For example, when the wing is moving straight forward, it isn't generating any thrust, but is helping the bird stay up.

Where fixed-wing aircraft are concerned, the wings do nothing but create lift (and drag). Much as the Bernoulli principle is foisted about, it is secondary in importance to the wing's attitude. You don't need a fancy-shaped piece of cardboard to demonstrate this idea to yourself; sweeping a sheet of card through the air at an angle where the front end is higher that the back end will create lift. You will feel this in your hand.

The powerplant of an aircraft -- which can be one or more propellers, or one or more jet engines, rockets, or other means to provide thrust -- pushes the whole aircraft forward through the air, and this forward motion is what makes the wings generate lift.

To summarise, it's a simple case of delegation: when building an aircraft, humans have the luxury of letting one team create lift, and another create thrust. (And there are other teams providing balance and directional stability too, but that's not relevant here.) Where birds are concerned, they've developed a system over many generations where one set of surfaces provides both lift and thrust. The way they've made this happen is by evolving wings that flap. It's not necessarily the best way, it's just the way these creatures became airborne by nature and not by design.

There are some aircraft whose wings flap like the wings of birds. They're called 'ornithopters'. They are, however, experimental aircraft, for the very simple reason that when designing something to fly through the air, humans don't have the same limitations as evolution does. In other words, we can play with different ideas on paper and with models before we commit to the real world.

I agree with some parts of various answers above. To really understand how birds gain lift and propel themselves forwards, you need a sound knowledge of aerodynamics. But if you want the short version, it's like the idea of sculling or paddling in water.

A bird's wings generates lift as well as thrust through a quite complicated sequence of motions. Look closely at a bird next time one flies past you, or better still, seek out some nature show that features a flying bird in slow motion. It's not just a simple up-and-down action; at different times when the wing is moving forwards, downwards, towards the rear and back up again, it is generating different proportions of lift and thrust. For example, when the wing is moving straight forward, it isn't generating any thrust, but is helping the bird stay up.

Where fixed-wing aircraft are concerned, the wings do nothing but create lift (and drag). Much as the Bernoulli principle is foisted about, it is secondary in importance to the wing's attitude. You don't need a fancy-shaped piece of cardboard to demonstrate this idea to yourself; sweeping a sheet of card through the air at an angle where the front end is higher that the back end will create lift. You will feel this in your hand.

The powerplant of an aircraft -- which can be one or more propellers, or one or more jet engines, rockets, or other means to provide thrust -- pushes the whole aircraft forward through the air, and this forward motion is what makes the wings generate lift.

To summarise, it's a simple case of delegation: when building an aircraft, humans have the luxury of letting one team create lift, and another create thrust. (And there are other teams providing balance and directional stability too, but that's not relevant here.) Where birds are concerned, they've developed a system over many generations where one set of surfaces provides both lift and thrust. The way they've made this happen is by evolving wings that flap. It's not necessarily the best way, it's just the way these creatures became airborne by nature and not by design.

♥

and sometimes I think to myself that... that is not so raven


Star if you remember " That's so Raven" on disney channel!

>:O

What is the guardian with a Hammer specie?

Thor y Spider-Man: ¿Cómo sobrevivir en su gran desafío?

https://comoydondever-spidermannowayhome.tumblr.com/

https://lanuevapelicula-segundasing.tumblr.com/

I heard the Wrecker. It could be anyone. Maybe even Zues. I wish I knew. I really want to know

I heard the Wrecker. It could be anyone. Maybe even Zues. I wish I knew. I really want to know

Who would you rather have on your team right now and why?

BQ - What's your relationship status?

in hospital she is dying