Multiplex 21 4215 Anleitung Seite 16

Important note
This model is not made of styrofoam™, and it is
not possible to glue the material using white glue
or epoxy. Please be sure to use cyano-acrylate glue
exclusively, preferably in conjunction with cyano
activator (kicker). Use medium or high-viscosity
(thick) cyano ("CA") for all joints. When gluing
Elapor® parts always spray one face with activator,
and allow it to air-dry until the surface looks "dry"
(takes about two minutes). Apply cyano glue to the
mating surface, then place the parts together and
immediately position them.
Please be cautious when working with cyano-
acrylate adhesives. These glues can harden in
seconds, so don't allow them to contact your
fingers or other parts of your body. Always wear
protective goggles to guard against eye injuries.
Keep these materials well out of the reach of
children.
1. Before assembling the model
Please check the contents of your kit.
You will find Figs. 01 + 02 and the Parts List helpful here.
Note: the control "snakes" are supplied in the following
lengths, and will need to be cut to final length:
2 off 3 / 2 Ø x 480 mm snake outer sleeve
2 off 2 / 1 Ø x 500 mm snake inner tube
2. Preparing the control snakes
The first step is to cut the snake outers and inners to the
lengths stated below. To cut the sleeves, place them on a
hard surface and roll them to and fro under a sharp balsa
knife, so that they are grooved all round. They can then
simply be broken off.
3 / 2 Ø snake outer sleeves
54 = 480 mm 55 = 400 mm
2 / 1 Ø snake inner tubes
56 = 500 mm 57 = 420 mm
The short pieces of sleeve left over are not required for the
model.
Fig. 03
3. Completing the snakes
Prepare the control snakes by slipping the inner tubes 56 /
57 into the outer sleeves 54 / 55, followed by the steel inner
rods 52 / 53. Parts 54, 56 and 52 are required for the rudder,
and parts 55, 57 and 53 for the elevator.
4. Preparing the fuselage shells
The first step is to install the Tiny-S servos for rudder and
elevator in the fuselage shells 3 + 4. Place the servos in the
recesses and apply a drop of thick cyano or hot-melt glue to
secure them. Fig. 04
The servo output arm extensions 43 are used to produce
16
the large control surface travels required for 3-D aerobatics.
However, they are also useful for "normal" aerobatics, as
the holes are the correct size for the pre-formed snake inner
rods. To fit the servo output arm extensions 43 cut off the
raised collar around the central hole in the original output
arm, and fix the parts together using the standard retaining
screw and the locating screw 49, as shown in Fig. 05. Don't
over-tighten the screws, or the threads will strip!
Carefully lay the fuselage shells down flat, and connect the
pre-formed end of the steel inner rods (including snake
sleeves) to the servo output arms. For "normal aerobatics"
use the innermost hole in the output arm extensions, and
for 3-D aerobatics the outermost hole. Apply cyano to the
channels for the snakes. Check once more that the fuselage
shell is exactly flat (straight), then glue the snake sleeve in
the channel. Fig. 06
5. Installing the motor mounts
Glue the two motor mounts 60 in the right and left fuselage
shells using cyano. Ensure that the mounts 60 fit flush with
the foam shells before you apply the glue. Fig. 07
6. Canopy latch
Glue the canopy latch clips 32 in the fuselage shells as
shown in Fig. 07.
7. Joining the fuselage shells
Tape the servo leads in the fuselage so that they don't get
in the way when you join the fuselage shells. Offer up the
fuselage shells 3 + 4 "dry" (no glue), and check that
everything fits correctly. Apply thick cyano to one shell, hold
the second shell against it, and check that the fuselage is
straight and correctly aligned before the glue sets. This may
take up to a minute, depending on humidity. Hold the
fuselage in your hands for a further two or three minutes,
checking constantly that the fuselage is still straight, because
the adhesive takes at least this length of time to cure. Fig.
08
Place the motor mount brace 62 between the rear ends of
the motor mounts (a pair of pointed-nose pliers is very useful
here) and secure it with cyano. Fig. 09
8. Preparing the tailplane
Glue together the elevator joiner components 46 + 47 on a
flat surface. It is important that the parts are not twisted
relative to each other.
Fig. 10
Cut slots for the hinges 42 in the tailplane 12 and the elevator
13 using a sharp balsa knife, positioned as shown in Figs.
11 + 12.
Ensure that the slots are in line with each other, and are
exactly central. Figs. 11 + 12
Install the hinges "dry" and check that the elevators are
aligned correctly and move freely. Dismantle the parts. Glue
the elevator joiner 46 / 47 between the elevator panels 13.
Push the hinges about ¼ of the way into the elevators, apply
cyano to both sides, then immediately push them into final