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CARF-Models Extra 330SC (3.1m)
The Fuselage:
The fuselage is also made in negative moulds, and it is also constructed using TAVS
technology, with carbon reinforcement in strategic positions. All the loadbearing internal
parts are glued in during manufacture, to ensure accurate location and reduce the
assembly time for you. The
fibreglass tubes in the wings and fuselage to receive the wing tube spar, the stab spar
tube, and the holes and reinforcement plates for the anti-rotation dowels, are already
installed.
The strong landing gear mount is pre-installed and doesn't need any extra reinforcement.
You have an extremely light weight fuselage, and the gear loads need to be led into the
structure gently. No glue joint needs to be stronger than the materials that it is attached
to, as it would just result in increased weight for no advantage. The landing gear is a fairly
flexible design, which works very much like shock absorbers. This plane is not made for
crashing, but the landing gear will take some hard landings without problems. Do not
change or modify it, as the results would only be negative. We had plenty of time and
experience to engineer the strength needed in this area - and we did! The motordome and
firewall are pre-installed, and provide plenty of strength for any engines up to 220cc on
the market today. See the Engine Installation section for details of engine and setting
thrust angles. The engine cowling should be attached using the method shown. It is only a
little work and this mounting system has been tested and proven for many years.
The Stabilisers:
The stab parts are also vacuum bagged sandwiched. The rudder and elevator control
surfaces are hinged with 4mm Ø tubes, fitted through phenolic hinge bearing plates which
are installed during manufacture for perfect alignment.
All the structural parts are pre-installed. The horizontal stabs are mounted with on a pair
of 20mm aluminium alloy tube spars. The rudder & elevator design allows for at least 45
degrees throw. It is mandatory that each stab is fitted with powerful digital servos, and
that the counter-balances are partially statically-balanced by adding about 20 gramms (1
ounce) of lead in each.
Take Care:
Composite sandwich parts are extremely strong, but fragile at the same time. Always
keep in mind that these contest airplanes are designed for minimum weight and maximum
strength in flight. Please take care of it, especially when it is being transported, to make
sure that none of the critical parts and linkages are damaged. Always handle your
airplane with great care, especially on the ground and during transport, so you will have
many hours of pleasure with it.
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