Flagge flag vlag pavillon

Flight stability of ornithopters

With all EV-ornithopters the powered flights often had to be interrupted prematurely because the ornithopters lost their flight stability. Causes include the following:

  • Loss of stabilizing force due to changes in the air speed or the angle of climb.
  • Lacking practice und nervousness of the pilot.
  • Visibility problems because far distance or large turning radius.

Probably the constantly changing longitudinal dihedral by the wing pitching and twisting has a part of this. In any case, in nearly all EV ornithopter models the horizontal stabilizers were too small after a new design was built.

The unstable forces of a flapping wing by variation of the speed could also duplicated by calculation (Please look at thehandbook, chapter 8.6).

The stability problems are apparent from the varying presentation of the fuselage in some of the following pictures of a circle flight.

wing downstroke
wing downstroke
wing upstroke
wing upstroke
upper final wing stroke position
upper final wing stroke position
lower final wing stroke position
lower final wing stroke position
gliding flight
gliding flight
middle of wing downstroke
middle of
downstroke
in banking flight
in banking flight
unstable flapping flight
unstable
flapping flight
unstable flapping flight on downstroke
unstable
flapping flight
gliding flight
gliding flight
unstable flapping flight on upstroke
unstable
flapping flight
in the middle of upstroke
middle of
upstroke