another way to do this is mount the rib with clecos to the spar, draw the
holes you want on the rib, lay piece of mylar or tracing paper over the rib
and leading edge spar, mylar is best however as it acts like a sheet of
metal, mark as many holes to use as alignment points on leading edge spar
and the rib, then carefully punch small holes through the mylar at all the
holes, dissemble this stuff and reassemble the stab with le skin clecoed in
place, lay the mylar over the corresponding holes and cleco the mylar to the
skins, if done carefully it should lie pretty close to the right place,
drill small guide holes (under 1/8) and dissemble, reassemble with ribs in
place and see if the make locations match the ribs below, if not bend and
play with it a little, remember this is a rebel and nothing is exact or
straight generally, these ribs don't have to be perfect
mike#007
-----Original Message-----
From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com]On Behalf Of
Jesse Jenks
Sent: Monday, December 12, 2005 11:30 AM
To:
rebel-builders@dcsol.com
Subject: Re: Stabilizer leading edge ribs
Dave,
I used careful measurements from existing rivet holes in the spar and also
from the edges of the skin to triangulate the locations of the rib holes.
Measure from the spar rivet line to to each rib rivet location with the skin
off. Then with the skin clecoed in place draw several lines (2 is probably
enough) on the skin, parallel to the spar, that extend to the edge of the
skin. Using the edge of a small ruler inside the skin aligned under a line
you just made, measure the distance from the rib to the skin edge. You must
sight down the line you made on the outside of the skin in order to keep the
ruler, which is inside the skin, as close to the line as possible. Transfer
the measurement to the outside and repeat for the other parallel line to get
2 points on your rib location line. Connect the dots and you have the
location of the EDGE of the rib. DO NOT DRILL ON THIS LINE. You have to make
another line 1/4" or so inboard in order to hit the center of the rib. Use
the first measurements you took from the spar rivet line to mark the 4 rivet
locations along the rib centerline. The trick is to keep the rib from moving
while you drill. Take measurements as you go to make sure. I'm sure there is
a better way to do this, but that's the best I could come up with, and it
did work pretty well, except for the already mentioned problem of holding
the rib in place while drilling. If you know a small child you could have
them put a hand in there to hold it.
Obviously you only need to go through all this trouble for the inboard rib.
For the tip rib, just trim the skin how you want it and eyeball the rivet
holes.
Jesse
From: "David L. Tuck" <
dltuck53@hotmail.com>
Reply-To: <
rebel-builders@dcsol.com>
To:
rebel-builders@dcsol.com
Subject: Re: Stabilizer leading edge ribs
Date: Mon, 12 Dec 2005 04:49:30 -0500
Thanks Mike, but the LE skins I have do not have holes pre punched.
From: "Mike Davis" <
mike.davis@dcsol.com>
Reply-To: <
rebel-builders@dcsol.com>
To: <
rebel-builders@dcsol.com>
Subject: Re: Stabilizer leading edge ribs
Date: Sun, 11 Dec 2005 10:36:43 -0900
When drilling ribs like this Dave you want to mark a line down the center
of
the ribs with marker, put you skin on and move the ribs back and forth
until
you find the line on the rib in the pre-punched skin hole, then drill.
I found that using the mandrel end of a couple of rivets I could move the
ribs... the end of the mandrel is a bit pointed, so it bites into the rib
flanges just a bit and allows you to move it until the line shows up in
the
holes. By using 2 rivets through 2 different pre-punched skin holes, you
can "walk" the rib into place.
Mike
----- Original Message -----
From: "David L. Tuck" <
dltuck53@hotmail.com>
To: <
rebel-builders@dcsol.com>
Sent: Sunday, December 11, 2005 8:40 AM
Subject: Re: Stabilizer leading edge ribs
The LE skins, where they are attached to the spars, and then after the
LE
skins are in place you are to drill the two ribs. This is where I
tried
a
hole finder as I drilled the fingers before I drill the LE skin. As
you
can
see I'm confused??
Thanks Dave/009
can't
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