■ FIGURE 3. The washers add strength to the connection between the straps
and the lunch box by increasing the area compressed together. Notice that the
top bolt is far enough below the lid zipper so that it doesn't interfere with
opening the zippered lid.
with the lunch box zipper.
In addition, the bottom washer
can’t be too close to the bottom
where it can’t fit inside the lunch
box. Now, use a hot knife or
soldering iron to melt two holes
through the strap and lunch box.
Place a washer on a bolt and
push the bolt through the bottom
hole in the lunch box, with the head
of the bolt on the inside. Then, line
up the strap’s bottom hole and push
the strap onto the bolt. Put a second
washer over the bolt, followed by the
nylock. Don’t tighten the nylock fully
at this time. Repeat a second time for
the top hole. Now, tighten both
The antenna boom is a sheet of
Coroplast that attaches an antenna
and an audio locator beacon to the
airframe. The boom is connected to
the back of the lunch box in the
same way that the straps are
connected to the sides of the
Begin by cutting a rectangular
panel of Coroplast three inches high
and six inches wider than the width
of the lunch box. Center it on the
back, and punch four holes through it
and the back of the lunch box. Then,
bolt it to the lunch box using nuts,
bolts, and washers, with the head of
the bolts inside the lunch box.
The boom will extend beyond
both sides of the lunch box by three
inches. That’s enough space for the
antenna and the audio beacon.
The first thing to add to the
antenna boom is an audio locator
beacon. The audio locator beacon is
a piezo alarm that produces a
volume of at least 80 dB. I
recommend an audio beacon like
item 273-080 from RadioShack.
This alarm is great not only
because it is loud running off a nine
volt battery, but because it also has
■ FIGURE 4. The back of the lunch box with its Coroplast antenna boom.