Extreme Flight YAK-54 ARF, Instruction Manual

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Hardware
Your new Extreme Flight 88 inch Yak includes all necessary hardware with the
exception of main wheels, axles and collars. These items were omitted as I have
been unable to source satisfactory versions of these items in China. I
recommend Dubro 3/16” axles and collars and 4 inch main wheels. If you intend
to use the wheel spats I highly recommend that you use a stiff set of wheels
versus soft foam wheels. This will help to prevent the spats from touching the
ground and possibly damaging them.
On the following page is a photo of the various connectors used for the Yak.
You will notice 3 sets of 3mm bolts. The 4 shortest of these 3mm bolts are the
stab retention bolts which mate up with the pre-installed blind nuts in the rear
of the fuselage. The 2 medium length 3mm bolts are for securing the carbon
fiber tailwheel assembly (the appropriate blind nuts are already installed in the
bottom rear of the fuselage to accept these bolts). The 4 longest 3mm bolts are
for securing the cowl.
You will find a complete pull-pull system, as well as high quality heavy duty ball
links, titanium turnbuckle pushrods and composite control horns, and a carbon
fiber tailwheel assembly. You will also find 3 white ball links. 2 of these are for
use with the included 2mm pushrod for the throttle assembly (this set-up is for
the DA-50-other engines may require a longer pushrod), the other is for the
bottom of the rudder to retain the tailwheel tiller arm.
The bonded sealing washers are used when mounting the cowl and
canopy/hatch. When the bolts used to retain the canopy/hatch and cowl are
tightened against the bonded sealing washer, the rubber on the washer
compresses, preventing the bolt from backing out. The rubber on the washer
also protects the surface of the cowl. Tighten the bolts until the rubber
compresses, but do not allow the metal part of the washer to make contact with
the cowl.
There are 4 titanium pushrods included in the hardware package. The 2 longest
are for the elevator linkage, the other 2 for the aileron linkage.
For best results, remove all set screws from the tailwheel assembly and
disassemble the unit. File flat spots on the tailwheel wire so that all set screws
will seat properly. Place a drop of blue Loctite on all set screws and re-insert
them into their holes.
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