Carf-Models Ultra Flash, Instruction Manual

Page: 22 / 44

Nosegear
All 3 Behotec C36 retract units are the identical, and there
is no ‘special’ nosegear unit. See photo P11 for view of
complete assembled nosegear.
Assemble the nosegear as shown here. Grind a small ‘flat’
about 5mm from the chamfered end of the longest (50mm)
Ø6mm ground steel connecting pin. Fit the wheel collar
provided with the bevelled edge towards the end of the pin
(see photo right), and tighten the M3 set screw firmly with
a drop of Loctite on the thread. Insert the pin from the top
of the retract unit and slide the trailing-link noseleg onto it,
making sure it fits on completely. If the connecting pin is a
bit long you can cut off a few millimetres.
The oleo leg is secured to the connection pin using the 2
black steel steering arms. These need to be shortened by
one ‘notch’. Grind or cut the last notch off each arm as
shown in the photo here. With the oleo fully on the con-
necting pin, tighten one steering arm to hold the leg in
place, and mark through the other hole with a felt pen.
Remove leg and grind a flat spot for that steering arm,
then reassemble, and tighten the arm into the flat spot
firmly. Mark through the other hole and repeat the proce-
dure. Finally apply a drop of Loctite to the threads.
The 65mm diameter dual ball-raced nosewheel has an alu-
minium hub in 2 halves that are fixed together using the 3
short countersunk bolts included. Centre the wheel in the
oleo forks using the 2 short aluminium tubes provided,
which slide over the threaded aluminium axle. If the wheel
does not turn smoothly when the axle is tightened you can
sand the ends of the tubes a little to reduce the length.
Secure with a drop of Loctite.
The nosegear retract unit should be fixed right at the back
edge of the factory-installed plywood mounting rails,
against bulkhead F2, as shown below. The cutout for the
nosegear retract and leg has been done at the factory for
you, and only needs a little sanding around the sides up to
the moulded-in lines.
Important:
Do
NOT
trim the
front
end of the opening for
the nose retract unit - leave the cut about 3mm inside the
moulded-in line.
With the oleo leg in the retracted position, lay the retract
unit in position at the back end of the mounting rails and
use the leg and wheel to make sure it is centred on the
fuselage axis. Drill Ø4mm through one of the mounting
holes in the retract unit, and insert one of the M4 x 16 allen
20
(above) Grind ‘flat’ in connecting
pin for wheelcollar.
(below) Wheelcollar must be at
end of pin, with bevel as shown.
(above) Shorten steering arms.
(below) Grind flats on connector
pin for steering arms as shown.
(bottom) Nosewheel oleo with
axle and centering tubes.