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

Where's the propellers?

So it has four rotors.

Cockpit, propeller, engine.

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

I never should've taken the freighter. Should've gone by clipper.

Yes, it must be a flying machine. It's got, um, propellers.

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

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

There's a gyroscope in it.

Helix

The Spiral

Spiral

If this plane is imaginary, then so are those engines and so are those props.

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.

But if my theory is for the birds and those props are real, make sure you notify my wife.

Spiral1

Spiral2

Complex number

Spiral number

Helix

Spiral

Squiral

Monkey wrench? Oh.

Squiral

Toxic spirals

Helix 2

Helix 3

Helix 4

Handedness

Spiral Shape

Change spiral

A spiral shape

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.

Curls on Green

OK, so here, this is the book spiral.

It's a double helix.

Spiral In

That's nothing new that's a propeller clock that's the rims that you can buy for your car.

Italy s Downward Spiral

A snail's shell is spiral in form.

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

My spine curves spiral.

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