Towhook Support Block; Completing The Canopy; Wing Joiners; Wing Retainers - Multiplex alpha junior unbespannt CONTEST line Instrucciones De Montaje

move the flight pack forward or aft at this stage to correct any
discrepancy. When everything fits correctly glue the battery
holder to the fuselage, applying thickened epoxy to both
sides at the rear and to the block E-05 at the front. Remember
to roughen the inside of the fuselage beforehand using 80-
grit paper.
Fig. 4
The flight pack is held in place as follows: at the rear the
battery engages under the retaining strap and at the front it
is attached using a strip of Velcro (hook-and-loop) tape.
Note that the adhesive on the Velcro tape does not stick very
well to bare wood, so you will need to fix the hook tape to the
plate using cyano.
Towhook support block (glider)
The towhook support block 10 should be epoxied in place at
this early stage while accessibility is still good. Measure the
hook position aft of the extreme point of the nose on the
underside of the fuselage using a tape measure:
for the alpha junior:
for the alpha club:
Drill a central x mm Ø hole at this point and seal it off on the
outside with a strip of tape. Roughen up the inside of the
fuselage at the block position using 80-grit abrasive paper.
Glue the towhook block 10 centrally over the hole using
thickened 5-minute epoxy.
Fig. 5

Completing the canopy

The canopy is supplied ready-made, but you may have to
trim it slightly. Remove all rough edges from the steel pin 42
and round off one end. Glue the prepared pin 42 in the
channeled wooden rail 14, then glue the channeled rail
centrally to the canopy using thickened 5-minute epoxy. The
actual canopy retainer consists of the steel spring 53 which
has to be bent to the shape shown. Fit the canopy plate 13
over the spring, and fix both parts to the canopy using 5-
minute epoxy after roughening the joint surfaces with 80-
grit abrasive paper.
Fig. 6
Trim the cross-piece 17 to fit in the rear part of the canopy
and glue it in place to stiffen that area of the moulding.

Wing joiners

The wing joiners consist of two 6 mm Ø steel rods 29. When
the model has been completed the rods should be glued
permanently in the outboard wing panels to prevent any risk
of them becoming lost. We recommend thick cyano for this.
Cut the incidence pegs 15 to a length of about 30 mm and
glue them in the trailing edge of the outboard panels, leaving
half their length projecting. You will need to drill out the
dowel holes to 4 mm Ø.

Wing retainers

When the outboard wing panels have been fitted, they must
be prevented from shifting in flight. The simplest method is
to apply a piece of adhesive tape over the joint.
The most convenient method is to fit the MULTIlock system,
MPX # 72 5138. These systems are supplied with full
installation instructions.
Fig. 7
345 mm
385 mm

Wing / fuselage fit

The wing is attached to the fuselage using two screws 30 and
31 and the washer 33. The threaded sleeves for the screws are
factory-fitted in the fuselage.
Trimming the canopy to fit the wing
You may need to trim the top rear end of the canopy to follow
the curvature of the wing when the wing is screwed to the
fuselage. Work carefully, as it is very easy to file away too
much material.

Fuselage slot for rudder bowden cable

The position of the slot is marked at the transition point
between the rudder and fuselage. Drill a series of 2 mm Ø
holes at the marked point and then file them out to form a
slot about 2.5 - 3 mm wide using a needle file. Remove rough
edges from the bowden cable 51 and slip it into the bowden
cable inner tube 52. Fit the bowden cable inner into the outer
sleeve in the fuselage from the front, route it out of the slot
and check that it slides smoothly. Trim the slot if necessary.
Remove the bowden cable again when you are satisfied.
Fig. 8

Completing the tailplane

The tailplane is designed to be removable for ease of
transport. It is attached to the fuselage using the locating
dowel 15 at the front and a screw 32 and washer 34 at the
rear. The first step is to align the tailplane with the wing with
the help of the support plate 16. First drill a 4.5 mm Ø hole at
the appropriate point in the support plate, and then attach
the wing to the fuselage. Check that the parts line up correctly,
then glue the support plate to the underside of the tailplane
using thickened epoxy. Align the wing and tailplane carefully
once more, and support the tailplane accurately until the
glue has set hard.
Mark the position of the locating dowel on the fuselage and
drill a 4 mm Ø hole at that point. Cut the dowel to a length of
25 mm, ensure that it fits snugly in the channel in the tailplane,
and check alignment once more. The dowel can then be
glued permanently to the tailplane.
Uncovered version: sand the tips and leading edge of the
tailplane to a rounded section as shown.
Fig. 9

Attaching the fin to the fuselage

Check that the fin is a snug fit in the slot in the fuselage; you
may need to clean up the inside faces of the slot using a
needle file. Slide the fin down into the fuselage until its
bottom face rests squarely on the bottom of the fuselage.
Screw the tailplane to the fuselage, and check that it is
possible to set the fin at exactly 90° to it.
Glue the fin in the fuselage, set it exactly upright and tape it
in place while the glue is setting. Caution: don't allow excess
epoxy to get into the rudder bowden cable and jam it.
Fig. 10
Installing the "EinStein" module in the fuselage (glider)
This module integrates a 7-channel receiver, 2 servos and a
switch, and we particularly recommend it for the alpha
junior / club. It consists of a high-quality 7-channel FM receiver
and two micro-size servos in a single case.
The unit is easy to fit, and takes only a few minutes to install.
Fit the receiver battery (4/600 mAh, MPX # 15 5533, or 4/1000
mAh, MPX # 15 5566) in the extreme nose of the fuselage.
Roughen the inside of the fuselage bottom just aft of the
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