…Model takes off from any position. It was enough to tighten the rubber motor, and two-winged “bird”, vigorously rebounding wings, began the rapid acceleration into the sky. She looked extremely simple. But the plainness of the shape did not prevent her from becoming the prototype of a family of similar vehicles with different engine types and power. They were United on one thing: almost all majority rose steadily skyward. The secret of them, probably, and was in its original simplicity, was originally a perfect Union, mass-inertial and aerodynamic forces…
The mechanism of the flight of a tiny South American Hummingbird is one of the most interesting from the point of view of aerodynamics. The fact that the scheme of the wings of a Hummingbird, perhaps the most simple: they move almost in the horizontal plane and the lifting force on the wing regardless of the direction of motion.
At first glance it seems that to build a sufficiently large mechanical model of the Hummingbird is very simple, but here comes into force the inexorable assumption that masculinizing forces while increasing the size of the mechanism increases so substantially that, perhaps, in nature there is material that can resist them. Make a model sized birdie pointless.
Let us examine more phases of movement of a Hummingbird’s wings. Each of them moves along the arc of a circle; in extreme points of the wing slows down, stops and begins a new phase, with the angle of attack is reversed.
But should blindly copy this process on the model:why,inthe end, to stop the wings in “dead” spots, not easier, without interrupting the stroke of the, skip the left wing to the right side of the model, and right at the same moment of time accordingly to the left.
Mapping the movements of the wings of the Hummingbird and its mechanical model:
A sector changes the direction of motion of the Hummingbird’s wings, and invert their angle of attack; B — sectors of the interchangeability of the wings of the model.