Notes On Using Epoxy; Fuselage; Removing The Fuselage Nose; Trimming The Motor Bulkhead - Multiplex alpha junior unbespannt CONTEST line Instrucciones De Montaje

For all other joints any standard modelling adhesive can
be used. We recommend in particular our wide range of
MULTIPLEX - ZACKI instant "cyano" glues, which includes
adhesives of different viscosity, fillers and cleaners. Use
ZACKI if you want construction to proceed easily,
smoothly and fast. Be sure to read the instructions
supplied with these materials.

Notes on using epoxy

Epoxy laminating resin is not an effective adhesive as it
stands. However, you can make a variety of excellent
adhesives by mixing additives into it. By careful choice of
filler you can match the characteristics of the adhesive to the
requirements of the moment.
1. Chopped cotton fibres, Order No. 60 2738, produce a
tough but flexible joint.
2. Superfine glass fibres, Order No. 60 2784, produce a
rock-hard joint.
3. Micro-balloons, Order No. 60 2779/80, convert the resin
into a lightweight filler paste.
4. The special thixotropic agent, Order No. 60 2782, makes
all the adhesives and fillers listed above thixotropic, i.e.
prevents them running off a vertical surface.
The alpha junior / club
The kit you have just purchased includes every item you
need to complete the basic airframe, including linkage
hardware, but does not include adhesives.
You can make a significant contribution to the model's
ultimate performance and appearance by building accurately,
carefully and patiently. A badly built model usually flies
badly and is hard to control. An accurately built and well
trimmed model will reward you with high performance,
docile handling and a pleasing appearance, and will give
pleasure to pilot and onlooker alike. Take your time - the
effort is well worth while. These building instructions have
been designed to help you get the best out of the kit, so
please follow the procedures and the sequence of assembly
described as accurately as possible.
MULTIPLEX model kits are subject to constant quality checks
throughout the production process, and we sincerely hope
that you are happy with the contents of your kit. However, we
would ask you to check all the parts before you start
construction, as we cannot exchange components which
you have already worked on. If you find any part is not
acceptable for any reason, we will readily correct or exchange
it once we have examined it. Just send the component to our
Model Department. Please be sure to include a brief
description of the fault.
The alpha junior is a rudder/elevator glider which can easily
be converted to a three-axis machine.
The alpha club is the ideal model for the week-end flyer who
is keen to move up from rudder/elevator to a three-axis
machine.
Both models can also be converted to electric power simply
and quickly.
... so let's get down to work.

Fuselage

We will start by completing the fuselage, as this is the
reference point for all the other components.
1 4
The first step is to decide whether to complete your model as
a pure glider or an electric-powered glider. Either model can
easily be converted to electric power by fitting the
appropriate electric conversion set, consisting of motor /
propeller / spinner / motor bulkhead and wooden parts.
The vacuum-moulded template required for removing the
fuselage nose is supplied in the kit.
alpha junior electric conversion set
MULTIcont 40/16 BEC MPX speed controller
7/1700 mAh battery
alpha club electric conversion set
MULTIcont 40/16 BEC MPX speed controller
10/1700 mAh battery

Removing the fuselage nose

Tack the vacuum-moulded template 9 (club / junior) to the
nose of the fuselage using a few drops of cyano, and carefully
remove the nose by sawing round the moulded-in flange
using a hacksaw blade.
Fig. 1
Trimming the motor bulkhead (included in the electric
conversion set)
The next step is to check that the fuselage follows the shape
of the spinner accurately, and this is done with the help of the
motor bulkhead E-01. Screw the motor to the motor bulkhead,
fit the propeller hub and spinner on the motor shaft, and
carefully trim the bulkhead to fit in the fuselage. Sand back
the bulkhead to the point where the spinner can be lined up
as accurately as possible with the contours of the fuselage
nose. The correct sidethrust and motor downthrust are
defined by the template, and should not be altered.
Roughen the inside of the fuselage with 80-grit abrasive
paper where it mates with the motor bulkhead. With the
motor and spinner still attached, glue the bulkhead in the
fuselage using a little 5-minute epoxy. Leave the resin to set
hard.
Carefully remove the motor again and apply a generous fillet
of thickened epoxy (use super-fine glass fibres, MPX # 60
2784) all round the joint on both sides. Be fairly sparing with
the epoxy on the motor side, otherwise you could find
problems when re-installing the motor.
Fig. 2
Cooling slots
Mark the position of the three cooling air slots on both sides
of the fuselage using a pencil. A template for the slots is
printed in these instructions.
Cut the cooling slots by drilling a series of closely-spaced 3
mm Ø holes, then filing them out carefully to final size.
Fig. 3
Making and installing the battery holder
Assemble the flight battery holder from the wooden parts E-
02, E-03 and E-04, and glue the parts together. Glue the block
E-05 to the underside of the battery holder at the front and fit
the screw E-06 to reinforce the joint. Sand the block E-05 to
follow the curvature of the fuselage, and place the battery
holder temporarily in the fuselage. Ensure that the holder
does not foul or damage the bowden cables, and adjust their
position if necessary. Before finally gluing the battery holder
in position check the model's Centre of Gravity, as you can
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