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Composite-ARF Yak 55 (2.1m/83")
techsupport@composite-arf.com
wing, not in the centre. This is NOT a disadvantage, if you
program in about 10% NEGATIVE aileron differential in
Centreline of hinge axis
your transmitter. This means that the 'down' throw needs to
be about 10% more than the up throw. Why? Because the
axis of the hinge is not at the centreline of the aileron, so it
moves slightly in and out when operated, and the aileron
gets a little "smaller" in surface area when moving down.
Phenolic control horn
The bottom slot needs some explanation, too. The cut line
is exactly in the correct position so that the aileron slides under the wing skin smoothly. If the cut
was a few mm forward or back, it would not work properly. So, make sure that the lip is not dam-
aged, and that the aileron slides under this lip perfectly. It will NOT lock at any time, if the lip is
not damaged. If damage occurs to the lip, you can cut off 2-3 mm, but you should NEVER need
to cut off more than this.
The Fuselage:
The fuselage is also made in negative moulds, constructed using TAVS technology. The main
internal structural parts for the landing gear, wing and stab spar supports, etc., are all glued in
during manufacture to ensure accurate location and reduce the assembly time for you. There is
no need to even check the incidences - you can be assured that these are already set in the
molds so that no adjustment is necessary.
The all-composite combined firewall and exhaust tunnel is factory-installed and aligned for your
convenience, and contributes greatly to the strength of the airframe.
The pre-installed landing gear mount is strong 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. The all-new
landing gear is quite a flexible design, which works very
much like shock absorbers. Do not change or modify it, as
the results would only be negative.
The Stabilisers:
The stab parts are also vacuum bagged sandwiched. The
rudder is hinged with a Ø 2mm steel wire, and the eleva-
tor control surfaces are factory-hinged with proprietary
hinge-points, 4 on each stab.
The rudder and elevator design allows for at least 45°
throw. The horizontal stabs are mounted with one Ø
14mm carbon tube and one 6mm anti-rotation pin each.
Servo Screws:
Fix all the servos into the milled plywood servo mounts
using the 2.9 Ø x13mm sheet metal screws provided in
the kit, not the standard screws normally supplied with
servos by the servo manufacturer. This is because all the
holes in our milled servo mounts are 2mm diameter, due
to our CNC manufacturing process, and this is too big for
the normal screws.
5
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