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Composite-ARF YAK 55SP (3m span)
cut for you, and the upper 4 vents should not
have cutouts - in effect they are just 'dummy'
vents. This is so that all the air coming in
through the front of the cowl must go thru' the
engine cylinder fins and out of the lower vents
for the most efficient cooling effect.
The air vents should all be equally spaced
40mm apart, with the front edge of the metal
vent 55mm from the step in the molded flange
on the front of the fuselage (see photo).
These vents are all fixed to the fuselage using
the small 2.2 x 10mm sheetmetal screws
included in the hardware pack, which go
through the fuselage skin into small (10 x
12mm) plywood blocks cut from the 12mm
wide ply strips included. Sand the area in
carefully and glued the blocks to the inside of
the fuselage with thick CA, at the corner of
each air vent.
Canopy Frame
The fibreglass canopy frame mountings are
already completed for you at the factory. It is
secured to the fuselage with four M4 x 12mm
allen bolts, fitted from the outside of the fuse-
lage, through the plywood tongues that are
glued to the canopy frame, into M4 T-nuts.
This system has been very well proven on all
of our aerobatic planes, and is a strong and
rigid solution.
Fitting the clear canopy into the frame can be
a little bit tricky, and this is a step by step
guide of how we do it. Of course you can also
use own your favourite glue and method.
Sand the inside edges of the canopy frame
carefully with 120 grit sandpaper, especially
the fibreglass joining tapes, to ensure a per-
fect fit of the canopy. Fit the canopy frame on
the fuselage and secure with all 4 bolts.
Roughly cut the canopy molding to shape,
and lay it on top of the frame, view from the
front to check that it is centred and symettri-
cally positioned, and then mark the approx.
shape with a felt pen or wax crayon. There is
an approx. 'cut-line' molded into in the edges
of the canopy to assist you, and you should
start by trimming 4 - 6mm outside this line.
techsupport@composite-arf.com
(above) Only the lower 4 louvres have cutouts,
the top 4 louvres are just 'dummy' air vents, and
should not be cut out.
(above) The fibreglass canopy frame has the 4
fixing tongues, the 2 alignment tabs and the bolt
fixings all factory-finished for you.
(below) Detail of the factory-finished canopy
securing tongues, which are secured with M4 x
12mm bolts & T-nuts
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