It's aerodynamic. Hi, DJ.

You can measure the aerodynamic forces it's creating.

Also, we see how we measure the aerodynamic efficiency.

In the first flight, no aerodynamic control of the vehicle.

Only if you control and regulate it, you will get that aerodynamic efficiency.

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

We had knowledge about the electromechanical efficiency and then we can calculate the aerodynamic efficiency.

And in the second flight, three minutes of fully controlled, aerodynamic flight at Mach 20.

And what we've done is made this year's Madone, the most aerodynamic Madone we've ever made.

64 meter wingspan to carry one pilot, the batteries, flies slowly enough with the aerodynamic efficiency.

The American munitions are more aerodynamic and has a propellant that burns faster the results are dramatic.

So we try to minimize this type of drag by making the airplane as aerodynamic as possible.

You could just hang it as a bed sheet, but again, the computation of all the physics gives you the aerodynamic shape.

Ah, honey, honey, your hand, your hand please. When your hand is horizontal, it's aerodynamic and you really don't feel a lot of drag.

And so in the second flight, we were able to get three minutes of fully aerodynamic control of the vehicle before we lost it.

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.

The way you normally build a system right now is you have a tube stack that has to be launched from the ground, and resist all kinds of aerodynamic forces.

You put these two things together, the net result is that all side forces on the glass are small and are mainly dominated by aerodynamic effects, which at these speeds are negligible.

So we looked at the birds, and we tried to make a model that is powerful, ultralight, and it must have excellent aerodynamic qualities that would fly by its own and only by flapping its wings.

Well, in order to fly, just as in a human aircraft, you need wings that can generate sufficient aerodynamic forces, you need an engine sufficient to generate the power required for flight, and you need a controller, and in the first human aircraft, the controller was basically the brain of Orville and Wilbur sitting in the cockpit.

But attached to the base of the wing is a set of little, tiny control muscles that are not very powerful at all, but they're very fast, and they're able to reconfigure the hinge of the wing on a stroke by stroke basis, and this is what enables the fly to change its wing and generate the changes in aerodynamic forces which change its flight trajectory.