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Composite-ARF YAK 55SP (3m span)
Tailwheel
The tail wheel unit shown is an optional
part available from C-ARF (# 801001),
and is mounted with 4 sheet metal
screws and 4 plastic 'U' brackets under
the fuselage, screwed into the plywood
reinforcement that's installed in the fuse-
lage at the factory.
You don't need to make the tailwheel
steerable if flying from grass surfaces; a
simple castoring action is fine.
However, for hard runways you may prefer to connect it either to the rudder horn with 2 small
springs, or a thin 'V-shaped' piano wire into a tube glued to the bottom edge of the rudder, as
seen here. 'Z-bends' secure the wires into the tailwheel tiller arm. Because of the geometry of
the Yak fin and rudder, the method shown above is a highly recommended solution for operat-
ing the steerable tailwheel, and gives accurate steering.
Remember - keep it lightweight at the tail end!
Cowling and Air Vents
The 1 piece cowling is already cut and
trimmed at the factory for you. Secure it to the
fuselage with 8 equally spaced (approx.
153mm centres) M3 x 12mm bolts, washers
and T-nuts (fitted inverted) that are glued
inside the fuselage (photo right).
Tape the cowl into position, and drill the Ø
3mm holes 7mm from the back edge of the
cowl, inserting a bolt in each after you have
drilled it to maintain perfect alignment.
Remove all bolts and add a drop of light oil, or
wax, to the threads. Sand the inside of the
surface in the positions that the T-nuts will be
secured.
Reinstall the bolts, and screw on the T-nuts
with the spikes facing inwards, reaching thru'
the front of the cowling. Secure each T-nut
with one drop of thick CA, then remove the
bolts, and fix the T-nuts properly with some 30
minute epoxy and micro-balloon mixture.
Mark the top of the cowling (on the inside) so
you always fit it in the correct orientation.
The Yak has 8 cnc pressed and punched alu-
minum air vents included in the kit, already
painted to match your fuselage. The cutouts in
the fuselage for the lower 4 vents are factory-
techsupport@composite-arf.com
(above) Cowl is secured to fuselage with eight
M3 bolts and T-nuts, glued to the inside of the
fuselage with the spikes facing inwards.
(below) The 8 punched aluminum louvres are
secured to the cowl with the small sheetmetal
screws, into small ply blocks glued on the inside
of the cowl with thick CA.
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