Multiplex FunCub 21 4243 Notice De Construction page 10

Important note
This model is not made of styrofoam™, and it is not possible to glue the material using white glue, polyurethane or
epoxy; these adhesives only produce a superficial bond which gives way when stressed. Use medium-viscosity
cyano-acrylate glue for all joints, preferably our Zacki-ELAPOR®, # 59 2727 - the cyano glue optimised specifically for
ELAPOR® particle foam.
If you use Zacki-ELAPOR® you will find that you do not need cyano 'kicker' or activator for most joints. However, if
you wish to use a different adhesive, and are therefore obliged to use kicker / activator spray, we recommend that
you apply the material in the open air as it can be injurious to health.
1. Before assembling the model
Please check the contents of your kit before you start working
on it. You will find Figs. 1 + 2 and the Parts List helpful here.
2. The fuselage
The first step is to glue the latch catches 22 and the motor
mounts 37 in both fuselage shells.
Fig. 3
3. Installing the servos
Check that the elevator and rudder servos are a snug fit in the
fuselage shells 3 + 4 and apply a drop of glue to the mounting
lugs to secure them. Fix the servo leads in place using paper
masking tape, so that the wires and connectors cannot cause
damage, and do not get in the way when the shells are joined.
Fig. 4
4. Control "snakes"
Prepare the control snakes 54 / 56 and 55 / 57: cut the outer
and inner sleeves to length, and slip the steel pushrods 52 /
53 inside them. Install the swivel pushrod connectors in the
outermost hole of the rudder and elevator horns. Note that the
pre-formed pushrod end should be connected to the second
hole from the outside of the servo output arm. Lay the fuselage
shells down flat so that they are not distorted.
Figs. 5 - 6
5. Preparing the wing spreader plates
Clip together the wing spreader plates 33 + 34, using a pair of
flat-nose pliers if necessary, and glue the joints. Glue the
prepared wing spreader plates in the right-hand fuselage
shell.
Fig. 7
6. Joining the fuselage shells
Offer up the fuselage shells 3 / 4, initially without glue. When
you are confident that everything fits properly, the shells can be
glued together. Keep the fuselage perfectly straight while the
glue is curing.
Fig. 7
7. Preparing the elevator pushrod connector
Fit the swivel pushrod connector 25 for the elevator 8 in the
outermost hole of the elevator horn 24, and secure it with the
washer 26 and nut 27. Caution: take care to fit the connector
with the barrel on the outside (see drawing). Be careful when
fitting the retaining nut: tighten it just to the point where the
barrel rotates smoothly, but without lost motion, and then use
the point of a needle to apply a tiny drop of cyano or paint to the
nut threads to prevent it working loose. Fit the socket-head
grubscrew 28 in the swivel pushrod connector 25 using the
allen key 29. Glue the horn 24 in the recess of the elevator 8,
with the row of linkage holes facing forward.
Fig. 8
10
8. Attaching the tailplane
Place the tailplane on the fuselage "dry" - without glue - and
check that it is possible to set it exactly horizontal; minor
trimming to the tailplane saddle might be necessary. When
you are satisfied, glue the tailplane in place, and immediately
align it accurately. Fig. 9
9. Fin and tailwheel unit
Fit the steel wire tailwheel unit 76 through the glue-fitting
tailwheel bracket 36 and the glue-fitting rudder horn 35. Bend
the straight end of the wire through 90°, as close to the horn
surface as possible, as shown in Fig. 10.
Glue the rudder horn 35 in the slot in the rudder, but only apply
cyano to the bottom surface. Allow the glue to harden, then cut
a slot about 1.5 mm wide above the horn to accept the tailwheel
wire. Wipe off any excess adhesive. Rotate the wire tailwheel
unit 76 until it is located over the rudder horn 35, and align the
parts carefully before gluing it in place with a little cyano. Install
the swivel pushrod connector, and lock the nut with a drop of
paint or glue as previously described.
Fig. 11
Install the tailwheel 77 as shown: fit one wheel retainer (tubular
rivet) 78 on the wire axle, followed by the wheel, and finally the
second retainer.
Fix both wheel retainers 78 to the axle with a drop of cyano.
Fig. 12
10. Gluing the fin to the fuselage
Check that the fin assembly is a snug fit in the fuselage and
tailplane, and glue it in place as shown.
Fig. 13
11. Main undercarriage
The main undercarriage 70 can now be prepared for
installation:
Slip a collet 72 onto each axle (right and left), and secure them
with the socket-head grubscrews 73. Fit the wheels 71 on the
axles and secure them with two further collets 72 and
grubscrews 73. Adjust the collet spacing to ensure that the
wheels rotate freely. Fig. 15
The undercarriage bracket 74 can now be glued to the
underside of the fuselage: press it in firmly before applying the
adhesive. Fig. 14
Push the main undercarriage unit 70 into the bracket until it
engages, then fit the retaining screw 75 to secure it.
Fig. 15
12. The wings
The wing panels 6 / 7 should not be glued together!
Before you install the spars in the wings, offer up the tubular
spars 50 / 51 and the spar joiners 30 / 31 "dry" to check that the
parts fit neatly.
Please note: the front spar joiner 30 is deeper than the rear
joiner 31.
When you are confident that everything fits properly, glue the