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3.3 Wing spar and lower D-box planking
To make the construction of the BATWING as simple and distortion-free as possible, the construction of the
D-Box begins first with the lower 5 x 2 mm jaw belt and the 1.5 mm balsa planking.
To do this, thread the jaw strip from the front, under the ribs and press them from below into the intended
recess of the ribs, upwards. When the recesses have been made accurately, the jaw bar holds almost by itself
and the lower planking (BU), in the provided slots of the anterior ribbed feet from the front, can be inserted
under the jaw spar.
Before starting the bonding, we put the intro-leading edge in the ribs. It ensures the correct distance of the
ribs in the nose area and protects the later structure against blows in the nose area. This consists of the
components N1 and N2. After cutting, polish with an abrasive paper the webs of the laser according to the
component contour.
Now the components N1 and N2 are put together at the tapping and fixed with superglue. Again, a plastic
pad to protect against bonding with the construction board, as well as the alignment with a ruler.
The so-made nose strip is now placed over the entire surface side of the front in the recesses of the ribs and
fixed with super glue.
Before the lower planking including the jaw spar can be glued to the ribs, the upper jaw spar 5 x 2 mm
should also be used. Again, as with the lower Kierfernholm pay attention to a positive fit, make any small
corrections with the file.
To guarantee a later right-angled position of the winglets, it is important to check the outer rib R14 for a
right-angled position (90 degrees). Here again an angle or Lego block is suitable.
