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Composite-ARF Extra 330L (2 x 2m)
techsupport@composite-arf.com
Building Instructions
General Tips:
We recommend that you follow the order of construction shown in this manual for the fuselage,
as it makes access to everything easier and saves time in the end.
The first thing to do is protect the finished paint on the outside of the model from scratches and
dents during building - so cover your work table with a piece of soft carpet, cloth or bubble-plas-
tic. The best way to stop small spots of glue getting stuck to the outside painted surfaces is to
give the whole model 2 good coats of clear car wax first, but of course you must be sure to
remove this 100% properly before adding any paint, decals or trim. Alternatively you can cover
the majority of the fuselage with the bubble-plastic used to pack your model for shipping, fixed
with paper masking tape, which also protects it very well.
When sanding areas inside of the fuselage to prepare the surface for gluing something onto it,
do NOT sand right through the layer of glasscloth on the inside foam sandwich! It is only neces-
sary to rough up the surface, with 60/80 grit, and wipe off any dust with alcohol (or similar) before
gluing to make a perfect joint. It is very important to prepare the inside of the fuselage properly,
by roughing up and cleaning the surface, before gluing any parts to it.
Before starting construction it is a good idea to check inside the fuselage for any loose glass
fibres that could cut your hands, and a quick scuff over any of these with a coarse Scotchbrite
pad will remove them.
Note: The photos in these instruction show the 2nd 'Pre-Production' prototype and some
parts in the 'Production' kit might vary slightly in shape or material.
Landing Gear
The 1st job is to fit the landing gear legs and you
can leave these in place to protect the bottom of the
fuselage during the rest of the assembly.
Composite-ARF developed a new carbonfibre land-
ing gear for our Extras. It consists of 45° laminated
carbon cloth and a huge number of carbon tows
inside, all made under vacuum and heat-cured.
However it is still light weight, and is flexible
enough to take the shock of any landings that are
less-than-perfect!
The plywood supports for the landing gear are
already installed at the factory, and reinforced with
fibreglass cloth. Both main legs are identical and
can be used either side. Fit the landing gear in
place on the fuselage as shown, and drill through 4
holes Ø 4mm for M4 bolts and washers. Remove
the carbon legs and open up the holes in the fuse-
lage and ply supports to 5.5mmØ. Fit the 4 blind
nuts inside the fuselage and fix with 30 min epoxy.
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