Installing Conventional Rc Components; Installing The Receiver Battery; Completing The Fuselage Linkages; Final Work On The Fuselage - Multiplex alpha junior unbespannt CONTEST line Instrucciones De Montaje

battery using 80-grit abrasive paper. Mark the position of the
"EinStein" and its mounting plate inside the fuselage, then
glue the mounting plate to the bottom of the fuselage using
thickened epoxy.
Fig. 11
Tip: to recharge the receiver battery it is necessary to
disconnect the plug from the "EinStein" module. You can
make the connector easier to reach by gluing a small piece of
scrap wood or similar to it as a handle, pointing straight up.
Installing conventional RC components in the fuselage.
As an alternative to the "EinStein" you can install two Micro
3 BB servos, MPX # 6 5049. For this configuration you will
need parts 11 and 12.
Glue the two servo mounting blocks 12 to the servo plate 11,
spaced 33 mm apart (servo case length). Mark the position of
the retaining screw holes on the blocks, drill them and screw
the servos in place. Fit the receiver battery (4/600 mAh, MPX
# 15 5533, or 4/1000 mAh, MPX # 15 5566) in the extreme nose
of the fuselage. Mark the position of the rear end of the
battery on the bottom of the fuselage, and roughen the
inside of the fuselage bottom just aft of that point using 80-
grit abrasive paper. Glue the servo plate to the bottom of the
fuselage using thickened epoxy. The receiver can be attached
to the fuselage using Velcro tape.
For this version you will need a separate switch, and we
recommend the switch harness with charge socket, MPX
# 8 5100.
Fig. 12

Installing the receiver battery

The receiver battery is held in place in the fuselage nose
using Velcro tape (MPX # 68 3112) and foam packing or
similar. At the top fit a piece of foam rubber or styrofoam
between the fuselage and the battery to prevent it moving.
In the electric version a separate receiver battery is not
required provided that you use a suitable BEC speed
controller, as the servos and receiver are powered by the
flight battery.

Completing the fuselage linkages

Remove any rough edges from the rudder pushrod 51 and
slip it into the bowden cable inner tube 52. Slip the inner into
the outer sleeve in the fuselage, and bend it slightly in the
desired direction if necessary. At the rudder end solder or
epoxy a clevis 36 to the pushrod (use UHU plus Endfest 300
slow-setting epoxy). Sand the end of the steel rod thoroughly
before gluing or soldering.
Connect the clevis to the rudder horn 39 and mark the
position of the horn on the rudder. Drill holes for the retaining
screws, and fix the horn in place using the spreader plate 40
and two screws 41. Check that full rudder movement is
available to both sides, and make adjustments if necessary.
Screw a locknut 38 and a clevis 36 onto the threaded coupler
37 and connect the clevis to the servo output arm. Cut the
pushrod to the correct length at the servo end, taking into
account the depth of the coupler socket, and sand the end
thoroughly. Set the elevators to neutral and solder or epoxy
the threaded coupler to the pushrod.
The elevator linkage is based on the steel pushrod 50.
Complete it by repeating the procedure described for the
rudder linkage.
Locate the channeled rail 14 which supports the bowden
cables at the front end of the fuselage, trim it to fit and glue
it to the fuselage sides.
1 6

Final work on the fuselage

Screw the towhook 35 to the fuselage.
Slip the receiver aerial into a spare bowden cable sleeve, tie
a knot at the end and lay the tube in the fuselage tail boom.
It does not need to be fixed in place.
Tip: to draw the aerial through the tube, first glue the end of
the aerial to a length of 0.6 mm Ø spring steel wire with a
drop of cyano, then pull the wire through the sleeve.
Completing the wing
At this point you have to decide which control surfaces on
the wings are to be radio-controlled.
The wing of the alpha junior is factory-prepared in such a
way that it is a simple matter to separate the ailerons and
landing flaps and link them to the RC system.
The ailerons and flaps can also be left in place initially if you
prefer, and linked up at a later date, i.e. after you have flown
the model for a while. The alpha club is designed for aileron
control from the outset.
There are two methods of slowing the model for the
landing approach:
If you have a suitable radio control system (with mixers) you
can set the ailerons to rise together to provide glide path
control. However, this type of brake is not very effective on
these models, and it is much better to use the landing flaps
incorporated in the inboard wing panels.

Installing the wing-mounted servos

The wings are factoroy-prepared to take the servos. The first
step is to cut away the covering film on the underside of the
wing at the servo position. Solder the end of the servo lead
(e.g. cable set, MPX # 8 5255) to a length of steel piano wire
and thread it through the holes in the wing ribs.
Place the servo (e.g. MS-X3 servo, MPX # 6 5035) in a piece of
heat-shrink sleeving and shrink the sleeve round it. Sand the
joint surface of the plastic sleeve and glue it in the wing using
5-minute epoxy. Connect the wires as described in the
instructions supplied with the cable set, and glue the socket
to the facing rib of the wing panel. When the glue has set
hard apply a strip of tape over the socket. Wax the tape and
polish it off with a soft cloth. Now push the plug into the
socket, apply thickened 5-minute epoxy to the plug and
push the wing panels together so that the plug is glued to
the other wing panel. The servo connector now engages
automatically, and the system is simple to install and works
reliably.
Cut out the servo fairing 8 and attach it with hinge tape after
connecting and adjusting the mechanical linkage.
Fig. 13
Separating the ailerons and/or landing flaps
Separate the control surfaces from the wing by sawing parallel
to the fuselage centreline using a metal-cutting blade to
produce a fine, clean cut. Place a ruler along the hinge line in
the spanwise direction, and cut through the connecting
piece with a sharp balsa knife. Sand the hinge line surface
completely flat using a sanding block, and apply adhesive
tape to the bare wood to seal it after ironing down any loose
edges of the film covering along the hinge edge using a film
iron. The aileron or flap can now be attached to the wing
using hinge tape, MPX # 70 3205. The best method is to apply
a single strip centrally along the top pivot line, then fold the
control surface up and over before applying a second strip
on the inside of the hinge.
Fig. 14