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the top skin of the center wing. It is very
difficult to center the spar perfectly when
joining the molds, but slight corrections can
be made by grinding the holes in both spar
and aluminum claws a little bit. As a rule of
thumb a tolerance of 3 mm (1/8
acceptable.
Then slide the carbon sleeves on the
aluminum studs, check that they don't have
inacceptable play and that the length would
not fowl the movement of the folding wing.
The rear edge of the carbon sleeve must
match the rear end of the aluminum stud, so
that only the 8mm steel pin is visible. The
inner edge (towards the root) must have a few
mm clearance around the aluminum claws
mounted to the center wing. Slide the outer
wing over the sleeve and confirm that the root
edge would fit reasonably close to the root
edge of the center wing. Up to 1 mm can be
adjusted when gluing the sleeve into the wing,
so this should not worry you right now. As we
want to glue the wing fold permanently to the
center wing, we want to make sure that no
serious mismatch would occur.
When the alignment of the wing folds is
acceptable, you should take the claws off the
spar, degrease the claws with alcohol or
acetone, and wax the bolts thoroughly. Then
apply Aeropoxy (or UHU Endfest) to the
surfaces, holes and bolts and permanently
install everything finally. Attention: Do NOT
tighten the bolts all the way! Leave them ½
turn open, to allow the glue to form a
perfectly matching bead between the spar and
the aluminum part. After the glue has settled
the next day, tighten the bolts finally by
applying the torque you're used to apply when
tightening e.g. an M5 prop bolt.
Attention: The above is a mandatory, but irreversible working step. You're in trouble now if
you did not wax the bolts or didn't trial fit and move the outer wings to the up and down lock
positions. The folding studs must move freely, without any resistance, through the whole range of
movement. If the stud is not moving freely, the mounting claws are under tension when bolted to
the spar. You also must be able to slide the locking pin all the way down in the downlock position
with two fingers. If you feel resistance here, you will risk a down lock failure later. Make sure
everything operates smoothly and freely! A folding wing is a beautiful scale feature, but it requires
technical understanding and careful attention to the mechanical design to operate safely!
Instruction Manual F4U-1D Corsair
is
")
Photo of outer wings line-up with
center wing edges
info@carf-models.com
Page 14
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