Hi Velko
This is a very nice looking wing movement but if you don’t add an active or an aerodynamic wing twist, this model can’t fly.
Kjell
http://www.youtube.com/user/wingdriv...16/R-yZwGotCZU

Kjell,

See anothers messages at this thread.

Velko

Velko.
I know that you are an inventor and a very good one.
I hope we soon can see some of yours Ornithopter flying.
Kjell

Electric powered model of ENTOID:


http://velkovelkov.blogspot.com/2009/09/entoid.html

New variant of ENTOID WING. Te wing consist of flexible lamelles, united with elastic bands. This wing is more adaptive and suitable for horizontal mode of flight of ENTOID too.

http://4.bp.blogspot.com/_h4sJVvXQSe...h/DSC00185.JPG

Another variant of ENTOID wing - elastic ribs and elastic membrane, according to "The main property of the flapping wing"-

http://ornithopter.org/forum/showthread.php?t=1523

Erich von Holst
 

Nathan,

What is this ornithopter of Erich von Holst?
Have You photo or drawing?


Nathan Chronister: "Erich von Holst achieved a more realistic flapping motion by incorporating a flexible wrist joint in his ornithopter wings. This was taken a step farther in Nathan Chronister's modified Tim Bird shown here. The outer portion of the wing actually overlaps the inner part, as feathers overlap in a real bird's wing. This allows the wing span and area to be decreased during the upstroke, in order to reduce air resistance. This seemingly desirable feature has not been widely used in ornithopters because it is difficult to implement. Most attempts result in decreased performance."

http://ornithopter.org/history.real.shtml

In the rubber powered model of Ornithopter of Erich von Holst the steel band, mounted in the front of the upper side of the wing giv an opportunity for "Figure 8" or "Figure 0" of outer wing movement, but not to reduce air resistance.
I think for this model more important is the elasticity of the whole wing - bending and torsion.

http://www.ornithopter.de/grafik/herzog/bussard_g.gif

The picture of Karl Herzog is no correctly. Erich von Holst wrote: "Dazu ist ein Federstahlstuck von 0,25 mm Dicke an der oberen Vorderkante des Armteils Hi..." Picture "B" is exactly, but picture "G" is not exactly.

Nathan,

My first design of ORNITHOPTER is from 1978.

Velko Velkov

CONTROL OF ORNITHOPTER WINGS

The change of the angle of the axis of the flapping movements is change of the direction of the traction too.
For this control is important not the flight velocity, as for the tail control, but the flapping movements velocity.
This control is very effective at take-off.

http://www.youtube.com/watch?v=pVGNFl3_Uas