Re: interesting link about ornithopters

From: john_kagan <john_kagan_at_hotmail.com>
Date: Tue, 22 Jun 2010 16:30:01 -0000

Yeah but (to play devil's advocate for a second):

The ornithopter in the CNet video gets its lift from the flapping wings. The record setting indoor free flight ornithopters get their lift from the canard and mainly get thrust from the flapping wings. That's a different flavor of challenge, no?

--- In Indoor_Construction_at_yahoogroups.com, "ray_harlan" <rbharlan@...> wrote:
>
> If you want to have something that is really smooth, try a bi-winged ornithopter. The wings run out of phase with each other to ensure that the crankshaft is always loaded and the rubber torque can't snap the shaft over to take up any backlash. And the canard designs are more efficient than conventional configurations, allowing the foreplane to have some decent lift.
>
> Another contributor to the strange motion of the model in the video is the weak wing spars. They offer little resistance to the rubber torque and help keep the crank at the up or down positions. But don't worry, the model will shake itself apart in a short time, so the builder will have to make a new one, hopefully with some improvements.
>
> Ray
>
> --- In Indoor_Construction_at_yahoogroups.com, "Ren" <nmonllor@> wrote:
> >
> > Hi Ray,
> > You noticed the exact same thing I did. The wings are popped into place, either up or down.
> > I've built the ornithopter offered by IMS and it has a much smoother transition in wing travel, thus allowing the ornithopter to fly more naturally; allowing it to climb and decent pretty smoothly.
> > Ren
> >
>
Received on Tue Jun 22 2010 - 09:30:51 CEST