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CARF-Models Extra 330SC (3.1m)
Check for vibrations through the whole throttle range. The engine should run smoothly
with no unusual vibration. If you think that there are any excessive vibrations at any
engine rpm's, DON'T FLY at this time and check your engine, spinner and propeller for
proper balancing. The lightweight sandwich composite parts don't like too much vibration
and they can suffer damage. The low mass of all the parts results in a low physical inertia,
so that any excess vibrations can affect the servos and linkages.
Make sure that your main spar tube is not damaged. Check that the anti-rotation pins for
the wings and horizontal stabiliser tubes are located correctly in their holes, and are not
loose. Check that the 4 plastic wing retaining nuts are tight, that the M3 bolts retaining the
horizontal stabilisers onto the aluminium spar tube are installed and tight, and that the
hinge tubes for the rudder and elevators cannot come out.
If you carefully checked all the points above and followed our advice exactly, you will have
a safe and successful first flight - and many hours of pleasure with your CARF Extra.
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 present this aircraft with incredible built-in strength, while still
being lightweight, and for a price that nobody could even consider a few 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 understanding.
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 combination with a very hard 2 mm foam sandwich to form a
hard and durable outer skin. Because of this TAVS technology very few additional
structural parts are needed except for main spars.
The wings are already set-up for 2 servos per aileron. They are attached to the fuselage
with the 4 threaded aluminium dowel anti-rotation pins, with 4 big plastic nuts inside the
fuselage. If the aluminium dowels come loose in the wing, the wing will slide outwards,
away from the fuselage, and the main spar tube will definitely break. So take great care to
inspect the glue joints of these anti-rotation dowels in the wing REGULARLY. Excessive
vibrations or hard shocks can cause the glue joints to weaken or break. Monitor these
joints whenever you set up your plane. Never forget to tighten the nuts inside the
fuselage. Please DO NOT modify these attachment dowels in any way, their perfect
function is proven for many years.
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