Hi Chris,
Thanks for looking and for your comments. I think your assumption is
correct. The ribs provide stiffness in a lightweight structure, and, as
long as the ribs are parallel to the local airflow, the impact on drag
is minimal.
Both the Beech Bonanza and the Piper Cherokee use similar structural
elements. Piper did learn, with the early Cherokees, that
outward-facing ribs were subject to cracking. They eventually reversed
the ribs, forming dimples in the metal, and eliminated the problems.
Jim Nichols
Tullahoma, TN USA
On 4/19/2015 1:35 PM, ChrisB wrote:
That’s another nice shot, Jim.
Why would the metal of the fin be ribbed like that? Is it to stiffen thin
metal, kept like that for lightness?
Chris
On 19 Apr 2015, at 19:14, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
In examining the film from the Bessa, I found an example of our international
aircraft, a S.O.C.A.T.A. MS894A that is based here. I'm sure that, among the
sailplanes based here, there are quite a few more from overseas.
http://www.gallery.leica-users.org/v/OldNick/French+Connection-1.jpg.html
<http://www.gallery.leica-users.org/v/OldNick/French+Connection-1.jpg.html>
Bessa R2a with Kodak BW400CN, lens not recorded.
--
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