09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
73
FLAP & AILERON SKIN FORMING
Use a tube with a 1 7/8"
to 2” outer diameter to roll form the top leading edges of the
flap and aileron skins.
1.
See
FIGURE 06-14B
for flap and aileron skin bending and orientation.
CAUTION:
If bent in the wrong direction, the skin must be replaced.
2.
Set the tube on a table and line up the skin top leading edge holes along the top
of the tube.
3.
Transfer drill (2) holes near the ends from the skin to the tube and cleco in place.
4.
Check the alignment of the holes in the skin to the top of the tube. They need to
follow the top of the tube pretty well.
5.
Transfer drill and cleco the rest of the holes in the skin to the tube.
6.
Clean the table to be used from debris and chips. Flip the skin/tube over and
place it on the edge of the table with the clecos hanging off.
7.
Drill a hole at either end of the forming tube outside diameter and insert a
screwdriver or anything handy to be used for leverage.
8.
This will probably take 2 people. Force the tube down toward the table and rotate
the tube to roll the skin tightly around the tube. Roll all the way until the clecos
are parallel over the skin (270° of rotation). Insert a rib and check to see if the
skin conforms to the ribs. Roll the tube more to increase the bend until the skin
conforms to the ribs.
9.
Repeat this process to form the top leading edge of the other skins.
