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Composite-ARF SuperXtra 330L (3.1m span)
General information about
fully-composite aircraft structure and design
All the parts are produced in negative molds, manufactured
using vacuum-bagged sandwich construction technology.
All parts are painted in the moulds, either single colour or
designer colour schemes. A new production method, called
TAVS (Total Area Vacuum Sandwich), enables us to pres-
ent this aircraft with incredible built-in strength, while still
being lightweight, and for a price that nobody could even
consider some years ago. This production process has
huge advantages, but a few disadvantages as well. These
facts need to be explained in advance for your better under-
standing.
Description of Parts
The Wings:
Both wing halves are made in negative moulds, and fully
vacuum bagged, using only 2 layers of 2 oz. cloth in com-
bination with a very hard 2 mm foam sandwich form a hard
and durable outer skin. Because of this TAVS technology
very few additional structural parts are needed except for
main spars.
The ailerons are hinged already for you. They are laminat-
ed in the wing mould and are attached to the main wing
with a special nylon hinge-cloth, sandwiched between the
outer skin and the foam. This nylon hinge is 100% safe and
durable. You will never have to worry about breaking it, or
wearing it out. There is no gap at all on the top wing sur-
face, and there is a very narrow slot in the bottom surface,
where the aileron slides under the main wing skin during
down throw. This hinge setup is the cleanest you can ever
obtain, but you have to take some care during assembly for
proper installation and servo set up.
First, the hinge line is on the top surface of the wing, not in the centre. This is NOT a disadvan-
tage, if you set in about 10% NEGATIVE aileron differential in your transmitter program. This
means that the 'down' throw needs to be about 10% more than the up throw.
Why? Because the axis of the hinge is not at the centreline of the aileron, so it moves slightly
in and out when it travels, and the aileron gets a little "bigger" in surface area when moving up,
and "smaller" when moving down. This is why you have to set the negative differential in your
transmitter to compensate for the size changing. 10% is a good starting point, and you will find
out the exact setting during the first flights, doing fast vertical rolls and watching the fuselage
rolling in a perfect line. You can set it perfectly, this is guaranteed.
The bottom slot needs some explanation, too. The cut line is exactly in the correct position so
that the aileron slides under the wing skin smoothly. If the cut was a few mm forward or back, it
techsupport@composite-arf.com
The internal structure of the new
SuperXtra wing, before the carbon
reinforcement & rovings are added
above & below the spar during the
joining process.
5
Centreline of hinge axis
Phenolic control horn
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