on this chopper.

The helicopter is key.

That day at the construction site, you came on a helicopter.

Get her up to the chopper.

Nothing is written on the helicopter.

A helicopter came down at the quarry site.

Bartchenkov, S.G. Ribalko, A.I.

No, it wasn't.

Meet me at the chopper in 10 minutes.

Moving there now. Move out!

The Pavlovich brothers burnt that chopper to cover up evidence...

I want to know where that chopper's been.

A camera from this top point of view can tell how far the marker is in both horizontal directions.

Of those, 11 are outside of the fuel range of this chopper.

And I came back afterward on the sled of the helicopter back.

Or do they?

I remember looking out of the window and seeing the second helicopter.

That went on the basic physics of how quadrotor flies

Those things might have identified the brothers, but what about the chopper?

The tail numbers were falsified, and the chopper was repainted.

All right. I'll collect my things. You meet me at the chopper in 10 minutes.

At the time, it was one of the most stable helicopters in existence.

So the scene the sky is filled with this fleet of helicopters carrying him in.

In this example let's say the pilot sees that the quadrotor is sinking.

Pete Hayley and I were in the helicopter and we saw the whole thing.

The chopper has to dodge because the traffickers may shoot at it.

When this lifting force equals that of gravity the quadrotor achieves overflight.

The helicopter was armed and attended by technicians who were preparing it for take off.

Hold your fire to the east.

The camera shine infrared light which bounces off of small reflective markers on the vehicle and go back to the camera.

It does essentially the same thing as the pilot, using the observed position of the quadrotor to evaluate control commands.

But, in the real world, not everyone is underneath the helicopter when it makes the drop.

A camera from the side point of view can tell how far the marker is in the vertical direction and one horizontal direction

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

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

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

All the smart bombs, and the drones, and the helicopters, and the satellite imaging in the world will not help you with that.

In order to bank, one propeller spins slightly faster than the opposite one.

Meanwhile the other two motors spin in the other direction plus the reaction torque pushes the vehicle clockwise

First, the pilot uses his eyes to observe the vehicle and figure out where it is and in which direction it's pointing.

Finally the quadrotor listens for the radio commands and adjust the speed of each motor accordingly.

We pulled the lab reports from the NTSB, and the chopper's engine tested positive for two distinct compounds.

Now let's see how each of these four steps changes in order to fly the quadrotor robotically.

In this case, the pilot has to stop the vehicle from sinking and thus decides to increase the speed of all four propellers.

So we've updated all four steps in order to make the quadrotor fly entirely by itself.