Re: Re: Rubber comnparison

From: Phedon Tsiknopoulos <phedon21t_at_yahoo.com>
Date: Tue, 11 Feb 2014 10:51:35 -0800

How about a 3-bladed prop to reduce the unwinding speed, and head for 50 minutes.

Sent from my iPhone

On Feb 11, 2014, at 5:21 AM, "mkirda_at_sbcglobal.net" <mkirda_at_sbcglobal.net> wrote:

> Slobodan Midic has a design that does that already, as well as Dr. Drela's info posted here. There is still a lot of room for experimentation and optimization with those designs. Drela's design has one drawback in that it applies torque a typical design may not be able to overcome. Offsetting the wing further may help, as may limiting the largest diameter a bit more. The hinges are also critical. Spring design for closing also becomes critical as the change comes over 160 degrees.
>
> By all means, experiment with these designs.
>
> Regards.
> Mike Kirda
>
> --- In Indoor_Construction_at_yahoogroups.com, Tapio Linkosalo <tapio.linkosalo_at_...> wrote:
> >
> > On Tue, Feb 11, 2014 at 12:36 PM, Phedon Tsiknopoulos
> > <phedon21t_at_...>wrote:
> >
> > >
> > >
> > > What if we have variable pitch as well as variable diameter?
> > >
> > >
> >
> >
> > Also that has been tried (change the pitch along changing diameter), but no
> > break-through on that either. Probably you would need to have variable
> > pitch distribution (VPD) prop for making the 50 mins.
> >
> >
> >
> > -Tapio-
> >
>
>
Received on Tue Feb 11 2014 - 10:51:37 CET