BE2c
36
7/8”
Page
3
Copyright©
2007
‐
11
M.K.
Bengtson
All
Rights
Reserved
Rev
07/11
Upper
Wings
Select
four
straight
¼”
x
1/8”
bass
or
spruce
spars
from
your
stock.
Shape
the
outboard
ends
of
the
spars
as
per
the
detail
on
the
plans.
For
each
wing;
Pin
W1
and
W1a
in
position.
Cut
spars
to
length
and
fix
to
plans.
Glue
and
place
the
inboard
one
of
the
two
R3’s
,
R5
and
the
wing
tip
R6
,
check
all
is
flat
to
the
building
surface,
straight,
and
the
ribs
square.
Also
note
that
with
the
inboard
ribs
of
the
upper
wings
the
spar
cut
outs
are
larger
than
the
spar
to
allow
later
insertion
of
the
ply
dihedral
braces
in
front
of
the
spar.
When
gluing
these
ribs
to
the
spars,
ensure
the
spar
is
against
the
rear
of
the
cut
out
in
the
ribs,
leaving
room
(1/16”)
for
the
ply
brace.
‘X’
pinning
the
spars
will
hold
them
down
and
upright
while
fitting
the
ribs.
Position
the
lower
inboard
ply
trailing
edge.
Leaving
rib
R2
till
last,
glue
in
the
remaining
ribs
and
half
ribs
to
the
wing.
Glue
in
rib
R2
using
the
RFG
guide
supplied,
this
will
help
achieve
the
correct
dihedral
angle
when
the
top
wings
are
joined.
The
top
of
rib
R2
leans
away
towards
the
wing
tip.
Add
the
upper
surface
ply
trailing
edges,
and
apply
a
little
weight
so
the
trailing
edge
stays
flat
and
straight.
The
ply
tailing
edge
pieces
require
no
extra
tapering,
the
narrowed
ribs
are
designed
to
let
the
edges
of
the
ply
to
just
meet
along
their
back
edges.
Cut
to
length
the
¼”
x
¼”
leading
edge
from
your
stick
stock.
Carefully
removing/sanding
off
one
point
of
the
square
section
for
its
length,
as
indicated
by
the
plans,
test
and
then
fit
the
leading
edge
to
the
mouths
of
the
ribs,
glue
in
place.
Install
the
ply
‘P’
pieces
either
side
of
the
1/8”
ribs
to
form
the
IP
strut
sockets.
Fit
the
TE
pieces
to
finish
the
wing
at
the
aileron
mount.
(Not
the
LE
pieces,
they
belong
to
the
aileron!)
Ailerons
Prepare
the
6a
rib
pieces
and
the
one
1/8”
6b
piece.
Pin
W2
and
LE
in
position
leaving
a
small
gap
at
the
root
end
for
aileron
clearance.
Using
a
pin
will
help
keep
the
gap.
Lay
a
ply
trailing
edge
(upper
wing,
lower
=
ply
with
horn
cut
out)
on
the
plan
and
fit
6b
at
the
root
end
and
a
6a
at
the
tip
end.
Glue
the
rest
of
the
6a
ribs
in
position
and
a
ply
trailing
edge
on
top.
Ensure
the
ply
pieces
are
sitting
flat
in
the
ribs
and
apply
some
weight
to
keep
it
all
flat
as
the
glue
hardens.
(On
the
upper
wings
this
top
surface
ply
piece
has
no
cut
out
)
The
Wing
Works.
Wings
at
various
stages.
Lower
Wings
Proceed
as
for
upper
wings
for
the
bulk
of
the
construction.
Lower
wing
spars
can
be
left
1/8”
overlong
at
the
root
ends;
there
are
cut
outs
in
the
fuse
sides
to
receive
these
spar
ends.
With
the
ailerons
ensure
the
control
horn
cut
outs
in
the
ply
trailing
edges
are
on
the
upper
surface
this
time.
The
Be
Warned!
Control
horn
cut
outs
in
the
ply
aileron
trailing
edges
need
particular
attention.
On
the
upper
wing
the
cut
outs
are
on
the
lower
surface,
on
the
lower
wing
they
are
on
the
upper
surface.
Also
make
sure
the
cut
out
is
over
its
position
on
the
plans.
