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Composite-ARF SuperXtra 330L (3.1m span)
The outer 2 holes are 33mm(1 5/16") from the bend, and
the inner hole is 127mm (2 5/16") from the bend. Note that
they are not equally position either side of the centreline.
The dimensions of 28mm and 8mm are measured from the
front of the carbon landing gear leg.
Fix the legs into the plane with the M6 x 20 bolts and 13mm
Ø washers into the blind nuts that are installed during man-
ufacture. Both main legs are identical, before you have
drilled the mounting holes, and can be used either side.
Fit the wheelpants to the legs as follows: Set the fuselage
on a level surface with the tailwheel in place. Pack the bot-
tom of the landing gear legs up by about half the diameter
of the wheels used (approx. 50mm/ 2"). Rough sand the
bottom of the carbon legs where the milled plywood parts
will be glued, to ensure a good bond. Fit the 2 plywood
pieces to the legs, using an M6 bolt and nut to hold loose-
ly in place. Hold the wheelpants against the milled plywood
pieces and adjust the angle of the plywood parts so that
they fit into the recesses in the moulded wheelpants, and
the bottom of the wheelpants are parallel to the ground and
each other. Tack glue the milled plywood parts to the bot-
tom of the legs with a drop of CA. Then glue the plywood
parts to the legs properly with slow epoxy and milled fibre.
To keep the wheelpants at exactly the correct angle and
flush against the milled plywood part that is glued to the
carbon leg, glue a small square (approx. 15mm x 15mm) of
scrap 3mm plywood inside the wheel pant 25mm above the
axle hole and glue an M3 blind nut to it. Then secure the
mainleg to the wheel pant by using an M3 bolt through the
leg. Do not use a bolt larger than M3, as the larger diame-
ter hole in the leg can weaken it.
The wheel axles are M6 x 70mm hardened steel bolts, fit-
ted through 6mm holes that you need to drill in the bottom
of the landing legs. Use the small dimple moulded into the
legs for the exact location. 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,
6mm wheel collar, M6 nut, washer, carbon landing gear leg,
and finally another washer and the locking nut.
You may need to adjust the thickness of the wheel collar, or
add a couple of extra washers to get the wheel exactly cen-
tred in the wheel pant. A drop of loctite on the M6 lock-nut
is good insurance.
It is just possible to assemble all the spacing washers on
the axle and wheel and squeeze it all into the wheelpant
carefully, but it is far easier to drill an 9mm (approx.3/8") Ø
hole in the outside of the wheelpant (directly opposite the
techsupport@composite-arf.com
(above) Milled plywood part glued
to carbon landing gear leg.
(above) Shows scrap 3mm ply-
wood plate and M3 blindnut fitted
inside wheelpant.
(below) View of leg showing M3
bolt and M6 axle bolt with locknut.
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