So in this picture you see that rotor four is spinning faster and rotor two is spinning slower.

Hexacopters and octocopters, with six and eight propellers, can provide redundancy, but quadrocopters are much more popular because they have the minimum number of fixed motor propeller pairs four.

So it has four rotors.

OK, so here, this is the book spiral.

It's a double helix.

And then finally, if you spin opposite pairs of rotors faster than the other pair, then the robot yaws about the vertical axis.

Cockpit, propeller, engine.

Italy s Downward Spiral

A snail's shell is spiral in form.

My spine curves spiral.

You'll be familiar with the double helix of DNA.

So there's a strand that goes like this, goes along one helix and binds it jumps to another helix and comes back.

This is DNA in its classic double helix form.

The spiral thread we call a solo hot spot.

She carries a mean spiral notebook and a pen.

You're not powering the propeller, you're powering the wheels.

And there is a very nice spiral up in the upper left.

And you can see a little bit of double helix forming there.

But let's see if I can very quickly get into the book spiral, because I think it's, as I said, the most this is the main reading room the most unique part of the building.

So we built a three stranded model.

Noting that the usefulness of food micro algae, above all, Spirulina platensis, along with other nutrients, to restore the health of severely malnourished people has been emphasized and recognized in international agreements, namely the Free Agreement for Cooperation in Scientific Research and Humanitarian Use of Micro alga Spirulina as Food and the Convention for the Use of Food Micro alga and Inter University Scientific Research,

So Wilkins said he thought it was the helix.

X ray diagram, he thought was comparable with the helix.

And you copy it by going from strand separating.

So let's call it the death spiral of negativity.

Now, after I did the simulation, I realized the whole village kind of spirals around, just like this, and here's that replicating line a self replicating line that unfolds into the fractal.

If you spin these rotors at the same speed, the robot hovers.

We want to look at individual strands and not think about the double helix.

Emphasizes the importance of intensifying and assisting national activities for the production and use of food micro algae, especially in member countries of the Intergovernmental Institution for the Use of Micro alga Spirulina against Malnutrition

The second is that the propellers are all pointing in the same direction of the glass, pointing up.

So these are helicopters with four rotors and they're roughly a meter or so in scale and weigh several pounds.

If you increase the speed of each of these rotors, then the robot flies up, it accelerates up.

And the other way around, if you increase the speed of rotor three and decrease the speed of rotor one, then the robot pitches forward.

Alexander Rose came up with this idea of a spiraloid tower with continuous sloping ramps.

They bail out as soon as they get to the top of Saint Ivo, that little spiral structure you see there.

United Kingdom of Great Britain and Northern Ireland

If we unwind the double helix and unzip the two strands, you see these things that look like teeth.

You mix them together and they make a rigid double helix.

In the case of the capture spiral, it needs to be so stretchy to absorb the impact of flying prey.

UNCTAD stressed the role of diversification in avoiding this downward spiral.

In a helicopter you feel and it's still a remarkable sensation you feel like you're being hauled up from above by a vibrating crane.

It's double stranded, it's a double helix, has the As, Ts, Cs and Gs that pair to hold the strands together.

And despite the aerodynamic interactions of these propeller blades, they're able to maintain stable flight.

To give you some sense of the power of this idea, the biggest block is what we call the book spiral.

There's the aggregate and flagelliform silk glands which combine to make the sticky capture spiral of an orb web.