Ren,
http://groups.yahoo.com/group/Indoor_Construction/files/Simplex%20Airfoil/
Fred Rash has given us a wonderful Simplex Airfoil Plotter in the files
section of the Indoor Group.
Pick your percentage of cord length for the height and run the program. It
will draw an airfoil for you. For slicing undercambered ribs use the upper
edge and move it down the thickness each time. Cut excess length from the
rear of the rib and you'll be in business.
Ken
On Sat, Apr 21, 2012 at 11:45 PM, Ren <nmonllor_at_tampabay.rr.com> wrote:
> **
>
>
> Hi Guys,
> How does someone go about designing the shape and depth of a rib for a
> wing?
> I know that the percentage of arc camber is the percentage of a wing
> chord. I also read a while back that a builder draws a circle of "X" number
> of inches in diameter, then takes a section of the circumference as long as
> the chord, but then, depending on the diameter of the circle you could
> theoretically end up with a semi-circle for a wing rib (that ain't gonna
> work). I look at the rib outline in Williams' book on page 43, for EZB1,
> then I look at the rib profile on page 90 for the pennyplane and there's a
> definate difference in shape and not just the arc.
> So where might I find this information in language that I can understand?
> For instance, lets say that I'm going to be flying in a place with a lower
> cieling than where I usually fly and I want to build a wing that will
> accomidate the lower cieling.
> I hope I'm not opening a can of worms here but, I sure would like to know
> a bit more about this aspect of design.
>
> Thanks in advance,
>
> Ren
>
>
>
Received on Sun Apr 22 2012 - 08:11:42 CEST