After attaching the landing gear, the
wing was made square to the fuselage.
A tape measure is used
to align the stabilizer
with the wing.
The chin scoop is in place and blended with the covering.
The gap at the spinner is a consistent 1mm all the way
benchmark against which the rest of the
assembly was measured.
Landing gear: The pockets in the W5
rib assemblies determine the angles of
the M. 20’s landing gear. If the wing and
the wire struts were built straight, then
the gear will be true when the struts are
inserted into the holes under the wing. If
not, carefully bend the struts to achieve
the correct angles.
I used silicone caulk on the wire struts
and the top of the gear leg to attach
my landing gear to the wing. The logic
was that in the event of an accident,
damage to the wing would be prevented
by allowing the gear to break free. This
works well on this model because of its
low wing loading, but a heavier model
might need a more secure attachment.
Wing: Attach the wing using the wing
pin at the leading edge and the wing bolt
at the trailing edge (TE). Check that
the wing is square by measuring from
each wingtip to the fin’s TE with a tape
measure. If the wing pin and bolt were
correctly installed, then the distance
from tip to tail will be the same on each
side. If it isn’t, adjust the wing bolt hole
with a rat-tail file to straighten the wing.
Now check that the tail fin is standing
vertically by sighting along a square
held against the surface of the table. If
the fin is not square, loosen the wing
bolt and carefully sand the edge of the
wing pocket to allow the fuselage to
rotate slightly. Retighten the bolt and
check again. Repeat until the fin stands
perpendicular to the table’s surface.
Horizontal stabilizer: Feed the
elevator joiner through the rear
of the slot at the back of the
fuselage. Now slide the stabilizer
through the same slot. Center
the stabilizer by measuring from
the tip of the stabilizer to the
slot on each side and making the
distance equal. Put a short pencil
mark on the top of each side of
the stabilizer where it meets the
Align the stabilizer with
the wing by using the tape to
measure from each wingtip to
the back corner of the stabilizer
as shown. Adjust the angle of
the stabilizer until the distance is equal
on both sides. Now
mark a long line
on each side of the
stabilizer where it
meets the fuselage.
the height from
the table to the tip
of the stabilizer on
each side. If the
height is not even,
then sand or file
the slot as required.
When the stabilizer is centered, aligned
with the wing, and parallel to the table,
epoxy it into place.
Chin scoop: The alignment of the chin
scoop isn’t critical to flight performance,
but it is important for the model to look
right. Black out the interior of the scoop
and then take some time to make sure it
fits correctly. Epoxy it into place while
holding the side panels tight against
the fuselage. After the epoxy cures, use
spackle or covering to cover the gap
between the sides of the scoop and the
Control surfaces: Now that the major
components are in place, the ailerons,
54 Model Aviation JANUARY 2016 www.ModelAviation.com