"It can fly at speeds up to 100 miles per hour. In fact, because of its
unique aerodynamic design, the hand-held plane actually picks up speed once
it starts soaring."

The first thing you have to ask is why it does not accelerate forever. The
answer is that it stops accelerating when it hits the ground.

"The coanda directs the airflow downward from its trailing edge,
turbocharging the internal wing and separating the airflow from the
underside of the duct top. This arrangement of airfoils reduces drag,
enhances lift and thrust output."

Most of the rest of the explanation sounds like gobbledygook, too --
something like what Acrocfi might have posted.