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Composite-ARF SuperXtra 330L (3.1m span)
Fuel Tank Base
The Fuel tank base is supplied as several cnc milled parts,
all from 3mm carbon-balsa composite material (see photo
on page 20). Assembly is self-explanatory as all parts have
interlocking tabs and slots. Four parts are glued on the top,
to give a bay for the tank to sit in, secured with cable ties in
the milled slots, and the 2 longer pieces are glued on the
bottom as support rails across the fuselage.
Assemble with thin CA, in the same manner as the Rudder
tray, and then secure with a good fillet of epoxy and
microballoons as seen here. Please remember to sand all
the mating surfaces a little for good glue adhesion.
The Fuel tank tray is a few millimetres too wide, to allow
you to sand and position it where you chose. The 'normal'
position is directly over the fibreglass sleeve for the wing
tube, and in this case you will need to notch the back 2 cor-
ners as shown. The carbon balsa support rail underneath
the front of the tank base, that spans across the fuselage,
will need a scrap balsa block under each end to support if
about 5mm above the carbon siderails that are fixed to the
fuselage sides. The bottom of the tray and the front surface
of the back carbon support rail, are then glued securely to
the fibreglass spar sleeve with epoxy and micro-balloons.
techsupport@composite-arf.com
(above) Under side view of the
assembled tank base
(below) Top view, with tank
secured using cable-ties in the
milled slots.
(above) Notch back corners of
tank base if fitting on top of the
spar sleeve as shown. You can just
see the balsa block front support.
(left) View of the completed tank
base installed in the plane. Space
on both sides can be used for
smoke tanks, or Nicads etc.
30
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