What paper went into that flap?

How would you make a single flap?

We're going to learn how to make one flap.

Well, there are other ways of making a flap.

I didn't have to try to flap my wings.

So that's the flap, and all the rest of the paper's left over.

It's very complicated, but it turns out they flap their wings very quickly.

And if I make the flap from the middle, it uses a full circle.

If I put the flap on the edge, it uses a half circle of paper.

And you can see there, it needs a quarter circle of paper to make a flap.

So, no matter how I make a flap, it needs some part of a circular region of paper.

If I make the flap as skinny as possible, I get to the limit of the minimum amount of paper needed.

The U.N. you know, they took 20 years just to add a flap to a tent, but I think we have some more exciting things.

Andrea is a living air filter that absorbs toxic gasses from air, contaminated indoor air.

And it turns out that the insects flap their wings in a very clever way, at a very high angle of attack that creates a structure at the leading edge of the wing, a little tornado like structure called a leading edge vortex, and it's that vortex that actually enables the wings to make enough force for the animal to stay in the air.

Air

Air

Air.

And from that stick figure, I somehow have to get to a folded shape that has a part for every bit of the subject, a flap for every leg.

And we tackle this problem by building giant, dynamically scaled model robot insects that would flap in giant pools of mineral oil where we could study the aerodynamic forces.

Air pollution

Air transport

By air

Air Force

Air agreements

I'm still heating the air every time and cooling the air every time.

Well, if I unfold it and go back to the crease pattern, you can see that the upper left corner of that shape is the paper that went into the flap.

Something's wrong with the air conditioner smell of burning V belts in the air.

Hot air rises, and air is drawn in off the sea to replace it.

Hot air rises.

Humanitarian Air Services

Air pollution atmosphere

Transportation by air

Transportation by air

(i) Air operations

Take a square. Fold it in half, fold it in half, fold it again, until it gets long and narrow, and then we'll say at the end of that, that's a flap.

The Israeli Air Force continued their air incursions into Lebanon, violating its sovereignty and territorial integrity.

There's air sea interactions.

Launched violent air raids.

Houses in the Air

Treason in the Air

The tire leaks air.

He hates air travel.

Air delivered Cluster Munitions

Conducting daily air patrols