11
BUILDING INSTRUCTIONS
alpha 21 Factory-covered Order No. 21 4185
alpha 21 Factory-covered Order No. 21 4184
alpha 21 elektric Factory-covered Order No. 21 4183
alpha 27 elektric Factory-covered Order No. 21 4182
High-performance model glider / electric glider designed
for the beginner.
Dear fellow modeller,
Congratulations on your choice of the alpha 21 /27 and
alpha 21/27 electric high-performance glider for the beginner.
These are attractive model aircraft with docile handling, and
we hope you will thoroughly enjoy building and flying your
model.
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. Just send the component to our Model Department.
Please be sure to include a brief description of the fault.
We are constantly working on improving our models, and
for this reason we must reserve the right to change the kit
contents in terms of shape or dimensions of parts, technology,
materials and fittings, without prior notification. Please
understand that we cannot entertain claims against us if the
kit contents do not agree in every respect with the instructions
and the illustrations.
Caution!
Radio-controlled models, and especially model aircraft, are
by no means playthings. Building and operating them safely
requires a certain level of technical competence and manual
skill, together with discipline and a responsible attitude at
the flying field.
Errors and carelessness in building and flying the model
can result in serious personal injury and damage to
property. Since we, as manufacturers, have no control over
the construction, maintenance and operation of our
products, we wish to take this opportunity to point out
these hazards, and to emphasise your personal
responsibility.
Kit contents (see parts list for details)
1.Lightweight wing, balsa-sheeted leading edge, fully
webbed double T-spar, sanded to airfoil section.
Ready-covered. Prepared for installation of aileron and
flap servos.
1 GRP fuselage with integral bowden cables and
threaded sockets for wings and tailplane, and hard,
white surface finish.
1 vacuum-moulded carbon-look canopy
1 balsa tailplane - # 21 4030 / 32 factory-covered
1 balsa fin - # 21 4030 / 32 factory-covered
1 bag wooden parts
1 bag top-quality small hardware items
1 bundle wire and rod
1 name placard decal set
1 set building instructions
alpha 21 specifications
Wingspan: 2100 mm
Fuselage length: 1130 mm
Wing area (FAI): 46 dm²
Weight, according to
finish and fittings: 1100 - 1600 g
Wing loading (FAI): min. 24 g / dm²
Wing section: SD 8040 mod.
Tailplane section: flat plate
alpha27 specifications
Wingspan: 2700 mm
Fuselage length: 1315 mm
Wing area (FAI): 63 dm²
Weight, according to
finish and fittings: 1600 - 2100 g
Wing loading (FAI): min. 26 g / dm²
Wing section: SD 8040 mod.
Tailplane section: flat plate
RC functions
Elevator 1 servo min. 15 Ncm
Rudder 1 servo min. 15 Ncm
Ailerons (21 option) 2 servos min. 15 Ncm
Landing flaps (optional) 2 servos min. 15 Ncm
Receiving system components
The fuselage is designed to accept the “Brick” module, MPX
# 1 4020/21, for the elevator and rudder. Alternatively you
can use two small servos, e.g. Micro 3BB, MPX # 6 5149.
The wings are designed to accept two MS-X3 servos, MPX #
6 5035, in each wing for the ailerons and landing flaps.
It is important that the receiver battery should be of generous
capacity to cope with the model’s receiving system, bearing
in mind that you will be using up to six servos. We recommend
a 600 mAh pack: 4 cells SCR-C, MPX Order No. 15 5553, or four
1000 mAh cells, MPX # 15 5566. Extra battery capacity always
makes more sense than lead ballast.
If you are using an “EinStein” module no separate switch
harness is required, as the switch is built-in. If you are using
a conventional receiver we recommend a switch harness
with charge socket, MPX Order No. 8 5139.
We strongly recommend that you also fit some form of
receiver battery monitor. MULTIPLEX offers a comprehensive
range:
Receiver battery tester Order No. 8 5541
Receiver battery alarm Order No. 8 5042
Receiver battery monitor Order No. 7 5046
If you prefer a conventional receiver we recommend the
Micro 5/7, MPX # 5 5933.
For the electrical connection between the wing-mounted
servos and the fuselage we recommend the Cable Set 2, MPX
Order No. 8 5255.
A similar cable set fitted with Universal (UNI) connectors is
available under MPX 8 5253.
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.
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