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Settting the correct Spacing (Gap) between VS Top Rib and Ru

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gareywittich2000(at)yahoo
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Posted: Fri May 09, 2008 8:27 pm Post subject: Settting the correct Spacing (Gap) between VS Top Rib and Ru

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 ???    



It seems to me that the Rod End Bearings on the Rudder

Spar need to be screwed into the Rudder Spar the "

Final" distance so that the Gap can be set up properly

BEFORE the Rudder Skin is finally riveted to the

Rudders Top Rib (R703) which sets this Gap.  My

understanding the dimensions for screwing the Rod End

Bearings as shown on the Drawing 7 is only

"approximate" and needs to be fined tuned later = this

could change this Gap distance.



  Or if one marks a center-line on the flange of the

Rudders Top Rib and aligns the pre-punched holes in

the Rudder Skin directly over the "center of this

line", does it Guarantee automatic clearance and a

constant Gap distance when the Rod End bearings are

set to their "Final" screwed-in distance ??????



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



 

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rv9flyer(at)sbcglobal.net
Guest

Posted: Sun May 11, 2008 1:05 am Post subject: Settting the correct Spacing (Gap) between VS Top Rib and Ru

Garey Wittich <gareywittich2000(at)yahoo.com> wrote:  [quote]  --> RV9-List message posted by: Garey Wittich 



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

   

   

[b]

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rv9flyer(at)sbcglobal.net
Guest

Posted: Sun May 11, 2008 2:09 am Post subject: Settting the correct Spacing (Gap) between VS Top Rib and Ru

Garey Wittich <gareywittich2000(at)yahoo.com> wrote:  [quote]  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)

[b]

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