Tailwheel Assembly - Carf-Models Extra 330sc Assembly Manual

Tailwheel Assembly:

When fitting the tailwheel assembly, the choice of wire style, or car-
bon leaf style, is completely up to your personal preference. You will
find there is plenty of area behind the stern post to accommodate al-
most all types of commercially available tailwheel assemblies. The flat
bottom surface of the Composite Arf Extra 330SC makes tailwheel
assembly mounting very simple. During construction we elected to
use a carbon leaf style tailwheel assembly from J&J Tailwheels.
Behind the stern post there is a pre installed ply mounting plate to
accommodate the fitment of the tailwheel assembly. First up, you
need to place a strip of masking tape along the bottom rear of the
fuselage, and then you need to locate the position of the stern post!
This is pretty simple using the following procedure. Measure from the
end of the fuselage to the surface of the stern post. Mark the begin-
ning of the stern post on the bottom of the fuselage.
The stern post is 10mm thick, mark this area clearly on the bottom of
the fuselage. The tailwheel mounting plate is approximately 100mm
long, and is mounted directly in front of the stern post. Measure
100mm from the rear of the stern post, this is the area you have avail-
able to mount your chosen tailwheel assembly. We opted for 40mm
bolt spacing on our tailwheel, we located the rear most bolt 20mm
from the edge of the stern post. We use 3mm mounting bolts, with
3mm T nuts inserted into the ply plate.
If you are using a traditional style tailwheel assembly which requires
springs to facilitate steering, consider mounting them to the underside
of the ball link retention bolt on the rudder control horn. Simply use a
long bolt and add some Dubro #557 horn brackets to attach the
springs. Alternatively if you use a direct drive system which attaches
directly to the rudder, you will need to apply some epoxy and micro
balloons to the mounting area, where the spring retaining bolt is fitted.
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