Use an Exacto knife to carefully cut out the nozzle hole in
the reinforced skirt.
The plastic skirt is sandwiched between the top and bottom
plates of the nozzle. After slipping the plastic spacers over
the bolts, the nozzle will be bolted to the underside of the
HoverBot’s bottom deck.
deck and set its mounting hardware (bolts, nuts, and plastic
spacers) aside where you won’t lose it. All you need right
now is one plastic octagonal nozzle plate. Since the nozzle
is centered on the bottom deck, it’s also centered on the
skirt. The easiest way to find the center of the octagonal
This is the underside view of the skirt and mounted nozzle.
Notice there’s a gap between the nozzle plates and the
bottom deck. This gap is where air fills the skirt to make
it billow and hug the ground.
skirt is to draw lines across two pairs of corners and see
where they intersect. At that intersection, center the nozzle
and draw the outline of the round hole of the nozzle on
the plastic skirt. Don’t draw the outside shape of the nozzle
on the skirt — it’s not needed.
The skirt material is sandwiched between the plates of
the nozzle and then bolted to the bottom deck. However,
the skirt’s 0.7 mil thick plastic won’t stand up to bolts and
air blasts without ripping, so you’re going to use some
packing tape to reinforce the nozzle area of the skirt. Apply
a layer of clear packaging tape to the top and bottom sides
of the skirt. Use enough tape to cover an area a little bit
larger than the nozzle plates, but not much larger. I suspect
that if the tape reinforcement covers a large area, it will
make the skirt stiff and reduce its ability to conform to the
ground. So in my HoverBot, the reinforced area does not
extend more than a 1/4 inch beyond the nozzle plates.
Next, drill or cut out two holes in the reinforced skirt
for the nozzle bolts. These are the two 4-40 bolts that hold
the nozzle away from the bottom deck. However, before
drilling the two holes, align the skirt to the deck so their
octagonal shapes line up. If you don’t align the skirt to the
deck before drilling the mounting holes, then mounting the
nozzle to the skirt will probably twist the skirt so its
octagonal shape does not fit the deck. Check your
alignment and mark the location of the nozzle mounting
SERVO 10.2010 47