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Composite-ARF Extra 300L (2.12m/84")
Remove the carbon legs and open up the holes in
the fuselage and ply supports to Ø 5.5mm. Refit the
legs with the washers and M4 bolts, and install the
T-nuts inside the fuselage. Secure the T-nuts to the
ply mount with a little 30 min epoxy.
Drill 4mm Ø thru' the molded dimple in the bottom
of the carbon legs, and the mark in the inside face
of the wheelpant for the M4 x 45mm axle bolt. Drill
6mm Ø on the outside of the wheelpants, directly
opposite the axle hole, to insert the bolt. Don't for-
get to make a 'left' and 'right' wheelpant !
Glue the small milled plywood part (20mm x 10mm)
inside the inner surface of each wheel pant, about
6mm above the 4mm Ø hole for the axle bolt. (see
drawing). This part is for the small sheetmetal
screw that holds the wheelpant at the correct angle
to the carbon leg. (see photo right)
Insert the wheels of your choice (65 - 75mm Ø) in
the wheelpant. The head of the bolt goes on the
outside of the wheel, inside the wheel pant. The
order of the items on the bolt is: Bolthead, washer,
wheel hub, washer, washers or wheel collars to
centre the wheel in the wheelpant, M4 nut, washer,
fibreglass wheelpant, carbon landing gear leg, and
finally another washer and the M4 locking nut. A
drop of Loctite before tightening the locknut is good
insurance.
To set the correct angle of the wheelpants in rela-
tion to the ground, set the fuselage on a level sur-
face and pack up the tail of the plane until the wing
is at about 0 degrees incidence to the ground. Eye
through both wheelpants so that they are
parallel and level, and secure with a Ø
2.9 x 13mm sheetmetal screw in each, as
shown, through the carbon leg into the
small plywood plate inside the wheel
pant.
C-ARF do not supply an optional tail-
wheel assembly for this Extra, but any
25mm/1" Ø lightweight wheel assembly
from a hobby store will do. You do not
need to make the tailwheel steerable
unless you fly from a hard runway - on
grass a simple fixed, or castoring action,
is fine. A 3mm plywood plate (15mm x
60mm) is already factory-installed in the
bottom of the fuselage in front of the fin
post to secure the tailwheel assembly to.
techsupport@composite-arf.com
milled ply
20 x 10mm
M4 nut
washer
M4 locknut
washer
washers/wheel collars
WHEELPANT X-Section
10
Carbonfibre landing
gear leg
65 -70mm
Ø wheel
wheelpant
M4 bolthead
washer
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