Sailplane Construction Project Session #55
The bare rudder primary structure required four
ribs and leading edge fill wood to give it its final shape. I spent most of
the day completing the rudder. When everything was dry, the rudder's leading
and trailing edges were carved and sanding to shape. The fin/rudder profile
is shown below.
This picture shows
the laminated fin trailing edge on the left and the
laminated rudder leading edge on the right. Notice the taper ratio of the
two surfaces from root to tip.
This view shows the fin/rudder's match along the
This is nice rear view looking at the rudder's
1/16" trailing edge, which clearly show the vertical taper and the
symmetrical airfoil shape of the fin/rudder ribs.
For the size of the rudder I incorporated into
the Sailplane's vertical tail, it has a 28 degree maximum deflection
limit set by non-interference with up elevator deflection as shown below.
This finally completes the entire tail of the
Sailplane. At this point I must put the project aside for several days and
start working on our taxes, which generally always turns out to be a big
"Kabuki Dance" for me. :O< So there will be no more Sailplane construction
reports for a while.
On a different note, I want to discuss an issue
with my new glasses. When I got them and started building again, I noticed
that the focal length of the bifocal was set way too far out. Upon
measuring, I discovered they focused out about 21" because I was having to
try and work almost at arm's length. I had an appointment with my
ophthalmologist this morning and explained my problem. He had me show him at
what distance I wanted to work. Then he evaluated my glasses and my eyes and
revised my prescription to correct the problem. You know, I had never
specified focal length of my bifocals before, I didn't even realize you
could! Then I took my glasses and my revised prescription over to
the optometrist. He is having a new set of lenses made at no cost to me,
since he warrants new glasses for 90 days. So for now, I am back to trying
to use my old glasses until the new ones are
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