The wing has the completed aileron.
The author’s Fokker F-XVIII
replicates the colors of the
The wing is built in two halves. Cut out all of the ribs and
dihedral pieces ( 5, 18, 19, and 20). Over the plans, pin the
bottom spars ( 1 and 2) to the building board. The bottom of
the spars ( 1 and 2) are tapered from the F1 rib to the centerline
of the wing. Position and glue all of the ribs to the spars ( 1 and
2). Try to keep the ribs square with the building board.
Glue the top spars ( 3 and 4) to the ribs. Insert and glue the
dihedral piece ( 5) to the ribs W1 to W5. Glue the leading edge
(LE) sub-spar ( 10) to the ribs. Sand the edges so that they
follow the contours of the ribs.
Remove the wing from the building board. Pin the bottom
trailing edge (TE) sheet ( 8) and the LE sheet ( 7) to the
building board. Smear glue on the sheets where the ribs and
the spar ( 1) and sub-spar ( 10) touch the ribs. Position the
wing correctly on top of these sheets and pin it to the building
board. While the glue is wet, bend the bottom LE sheeting ( 7)
upward until it touches the sub-spar. Secure the sheeting in
that position until the glue dries. Glue on the top TE sheet ( 9).
In the front, glue on the top LE sheeting ( 6). Glue the
LE spar ( 11) to the wing. At this time, glue all of the top
capstrips to the ribs. Remove the wing and glue the wingtip
sheet between the LE and TE sheets. Glue the plywood plates
( 12 and 13) to ribs W4 and W5. Glue the bottom sheeting
between ribs W4 and W5 and between ribs W7 and W8. Then
glue on all of the bottom capstrips.
Mark the outline of the aileron and cut it out from the wing.
Glue the hinge spar ( 15) to the wing. Glue the plywood plate
( 17) to the bottom aileron sheeting. Glue the LE sheet ( 16)
to the aileron and cap the ends. Pull the extension wire for the
aileron servo between ribs W1 and W8. The motor wires will
be pulled when the nacelles are being installed. Now build the
other half of the wing to the same stage and sand both halves
of the wing.
Position the wing halves so the spars ( 1 and 2) from each
half are touching. Place and secure the dihedral shims under
rib W16. Now, glue the dihedral braces ( 19) to rib W1 and to
the braces ( 5). Glue the brace ( 18) to rib W1 and ( 20) to rib
W1 and spars ( 2 and 4).
Glue the LE spars ( 10 and 11) to rib W1. Glue in the
hardwood dowel to the LE and brace ( 18 and 19). Glue the
hardwood blocks ( 21) to rib W1. In the middle of the wing,
glue the bottom and the top sheeting to rib W1. Pull the ends
of the motor wires out of the wing.
The nacelles are built in two halves—top and bottom.
Accurately pin the top halves of formers N1, N2, N3, N4, N5
and balsa block ( 25) to the building board, making sure that
they are square with the building board. Glue on sheeting ( 22,
23, and 24) to the formers. Glue the cone-shaped balsa block
( 26) to former N5.
Make the holes for the nacelle’s struts in the sheeting. Build
the bottom half the same
way. Temporarily glue
both halves to each
other by smearing a
small amount of glue on the
corners of N1 and at the tip of the
cone ( 26). When the glue dries, sand
the nacelle. After it is sanded, separate
the top from the bottom.
Build the second nacelle the same way.
Before the nacelles can be installed, cut out
two parts of the nacelles’ alignment
jig out of cardboard or scrap balsa.
From 1/8-inch brass tubing, cut out
three struts ( 27) and three struts
( 28). Pin the alignment jig to the wing.
Pin the top half of the nacelles to the
jig. Slide the brass struts ( 28) into the
slots in formers N2 and N3 and balsa
block ( 25).
When you are satisfied with alignment,
epoxy the struts to the nacelle only. When the
38 Model Aviation JANUARY 2016 www.ModelAviation.com