Today's Message Index:
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1. 02:05 AM - Re: Settting the correct Spacing (Gap) between VS Top Rib and Rudder Top Rib (Gregory Richardson)
2. 03:09 AM - Re: Settting the correct Spacing (Gap) between VS Top Rib and Rudder Top Rib (Gregory Richardson)
Message 1
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| Subject: | Re: Settting the correct Spacing (Gap) between VS Top Rib and |
Rudder Top Rib
Greetings:
The construction of my RV8A (RV7 and RV9 are the
same) the Rudders Top Rib swings OVER the top Rib of
the VS. There is suppose to be a "Gap" between the
two Ribs so that there is no interference (rubbing of
them together) as the Rudder is moved.
My question is - how do you set this Gap up ???
Garey,
It has been a while since I constructed my VS and Rudder, but as I recall
I did nothing special. I think I was probably young and dumb into the project,
and just trusted that all would turn out ok. I built both pieces independant
of the other, and fitted them together at the very end. I ended up with acceptable
spacing, but did find that the bearing distance from the rear VS spar
is critical if you want to prevent binding. This also sets the angle between
the VS and the rudder, and thus the spacing for the overhang. When I do the final
assembly vs the test fit, I may have to do some filing, but so far I remember
having equal spacing between the two.
Good luck!!!
Greg Richardson
RV9A fuse
Message 2
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| Subject: | Re: Settting the correct Spacing (Gap) between VS Top Rib and |
Rudder Top Rib
Garey Wittich <gareywittich2000@yahoo.com> wrote: The Orndorff Tapes show the
Rod End bearings installed
in the Rudder Spar (no Rod End Bearing dimensions
given) and mounted to the VS and the Gap set by
bending Up the Rudders Top Rib (R703) to parallel the
VS Top Rib. Maybe I am missing something. So what
worked for you - set the Rod End Bearings "approx" or
align the pre-punched holes in the Rudder Skin
directly over the marked center-line on the Rudders
Top Rib flange and THEN rivet the Rudder Skin ????
Once the Rudder Skin is riveted to the Rudders Top
Rib, the Rudders Top Rib is fixed and can NOT be
readjusted to get the "correct Gap" later.
Appreciate your help, Garey Wittich
Garey,
I just re read your post, and saw the second part of the question there. That
set me to looking, and I found out what you are saying. I was able to locate,
from my print 6pp, that the distance from spar to spar, measured at the top
of the rudder just below the counterbalance, is supposed to be 2". At the root,
which I took to be the bottom of the rudder, the spar to spar distance should
be set at 2 1/2". On the 9A, the pre-set bearing distances are not in the
instructions, or on the prints either. I realized that I purchased my $50 set
of prepurchase full prints and instructions at about that time, and was delving
through them. Yours may be different, but if you read ahead to where the
empenage is mounted to the fuselage, on my page 8-15 and 8-16, it states:
"Thread the rod end bearings and jam nuts into the rudder spar. Measure
from the center of the pivot bolt hole, to the forward face of the rudder spar.
As a starting point, you may use these measurements: Top 0.80" Middle
0.990456789" (author states, and is why I remembered seeing it) OK get
sloppy and call it 1.0" Bottom 1.00" (to face of spar doubler).
Adjust these measurements as neccessary to make the rudder swing without
binding."
I think when I used those measurements, I ended up adjusting the center bearing
by 1/2 turn to prevent binding. Hope this helps you.
Good luck,
Greg Richardson
RV9A (fuselage)
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