Re: Curved Wing Tips and Vertical Stab

From: leop12345 <leop_at_lyradev.com>
Date: Thu, 09 Aug 2007 22:20:53 -0000

I do not think that the wing area, as measured by the horizontal
projection, is decreased by having dihedral. Thus, having dihedral
should not decrease the maximum lifting area as the horizontal span
stays the same while the spar length increases.

Leo P


--- In Indoor_Construction_at_yahoogroups.com, "calgoddard"
<calgoddard_at_...> wrote:
>
> Thanks Bill.
>
> I can always count on you for some good input.
>
> Here is another question.
>
> I have seen some competitors try to max lifting area of the main
> wing (under max span and chord limitations) by not having any wing
> tip dihedral, or any dihedral at all for that matter.
>
> They have a flat main wing (except for the airfoil ribs of course)
> and they have vertical tip plates. See Double Trouble for example
by
> Brent Sanborn I believe.
>
> I tried this a few times, and the planes suffered from occasional
> inherent instability problems (slide slip and/or spiral down).
Once
> I got one of these models to fly really, really well, but on only
> one flight. It couldn't be duplicated.
>
> I found that a main wing with outboard wing tip dihedral sections
> seems the most stable, and that, oddly, the angle of these doesn't
> make much difference as long as it was at least 30 degrees.
>
> Your thoughts?
>
Received on Thu Aug 09 2007 - 15:22:13 CEST