Aeronaut Galaxy Instruction Manual

Galaxy
Galaxy building instructions 1
Building Instructions
Galaxy RC model aircraft
Order No. 1306/00
The outstanding feature of this high-performance electric glider is its superb performance in the air.
The three-part wing features a combination of the E 193 / RG15 airfoils, and is designed expressly for
thermalling at low airspeeds. The aeroplane’s high level of inherent stability and lightweight construc-
tion make it absolutely ideal for the beginner’s first steps in our hobby, but it is also a great model for
relaxed ‘evening session’ flying by experienced pilots. The Galaxy is an agile machine with good con-
trol response for turning and landing. The power system can be based either on a simple, low-cost
electric motor or a high-performance brushless type.
Specification:
Wingspan approx. 2000 mm
Length approx. 1100 mm
Wing area approx. 42 dm²
All-up weight approx. 0.9 - 1.15 kg
Wing loading approx. 21.5 - 27.4 g/dm²
RC functions: Aileron, elevator,
rudder, throttle

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Galaxy building instructions 2
Parts List
Primary components:
1) Fuselage, white pigmented, with V-tail joiners 1 GRP, ready made
2) V-tail panels with control surfaces 2 (l + r) Wood construction, ready made
3) Wing centre section 1 Wood construction, ready made
4) Outboard wing panels with ailerons + winglets 2 (l + r) Wood construction, ready made
5) Aileron servo covers 1 pair Vac.-moulded plastic
Contents, small parts bag:
6) Motor bulkhead 1 GRP, ready made
7) Fuselage former for tail ‘snakes’ 1 Wood, ready made
8) V-tail pushrod 2 Steel wire, 0.8 Ø x 800 mm
9) Fuselage servo plate 1 Poplar plywood, machined
10) V-tail horn 2 Pre-formed steel rod with linkage ball
11) Ball-link 2 Plastic, ready made
12) Threaded coupler, bored 0.8 mm, threaded M2 4 Brass, ready made
13) Pinned clevis, V-tail 2 sets Ready made
14) Front wing joiner, pre-formed 2 Steel, 3 Ø x 110 mm
15) Rear wing joiner, pre-formed 2 Steel, 2 Ø x 110 mm
16) Wing locating peg, leading edge 1 Beech, 4 Ø x 40 mm
17) Wing retaining screw 1 Nylon, M5 x 20 mm
18) Control surface horn 2 Plastic, ready made
19) Pinned clevis, aileron 2 sets Ready made
20) Threaded coupler, bored 1.6 mm, threaded M2 2 Brass, ready made
21) Aileron pushrod 2 Rod with Z-bend, 75 mm
22) Aileron servo mount 2 pairs Wood, ready made
23) Threaded sleeve 1 Ready made, M4
24) Spreader disc for threaded sleeve 1 Wood, ready made
25) Building instructions 1 Ready made
Essential accessories
Modelling knife, metal file, ruler, set of screwdrivers, 5-minute epoxy, thin cyano-acrylate, paper mask-
ing tape, soldering iron, two 60 cm servo extension leads.
Recommended RC equipment
•Four servos (all 9 - 13 mm)
•Receiver (min. four channels)
•Transmitter with V-tail mixer
Recommended power system
•Motor: Actro C8 18A
(Order No. 7002/38)
•Speed controller: Actronic 40bec
(Order No. 7002/51)
•Folding propeller: 12 x 6.5"
(Order No. 7234/46)
•Flight battery: 3S LiPo, approx. 2200 mAh

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Galaxy building instructions 3
Wing
•The wing consists of three panels: the centre section, which is screwed to the fuselage, and the
two outboard panels which plug into the centre section. All the wing panels are of conventional
built-up construction, and are supplied already film-covered. The ailerons are attached using hinge
tape, and the dihedral angle between the wing panels is pre-defined.
•The wing centre section is attached to the
fuselage by a central retaining screw. Re-
move the film over the screw-hole on the un-
derside of the centre section using a hot sol-
dering iron; the tip of the soldering iron sticks
the edges of the film down at the same time.
Glue the beech dowel in the central hole in
the leading edge; it should project forward by
about 15 mm.
•Now remove the film over all the other open-
ings: the cable holes on the underside of the
centre section and the tip ribs, and those in
the root ribs of the outboard wing panels.
•Remove the film over the servo wells on the
underside of the wing, again using a sol-
dering iron.
•Cut off the servo plug, leaving it attached to
a short length of cable. Place the aileron ser-
vo in the servo well and thread the lead from
the servo well through the sleeve and out of
the root rib. Solder the plug to the servo lead
again as shown: cut off the servo lead so
that only about 20 mm projects from the root
rib, including the connector.
•The aileron servos are installed using the
plywood mounts supplied. To determine their
exact position, fit the mounts on the servo
and position this assembly in the servo well
‘dry’ (without glue). You can now mark the
exact position of the servo mounts.
•Glue the servo mounts in the wing using
thick cyano or epoxy; allow the glue to set
really hard before installing the servos again.
Fix the servo to the mounts using hot-melt
glue or a retaining screw.
•Two 60 cm extension leads (terminating in
sockets) must be installed in the wing centre
section in order to connect the aileron servos
in the outboard panels to the receiver. The
sockets themselves can be glued in the
opening in the facing ribs. If you opt to do
this, take care not to allow glue to run into
the socket.

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Galaxy building instructions 4
•At the transition between the wing centre
section and the fuselage the servo leads
should project by about 5 cm. Naturally it is
also possible to install a single four-pin con-
nector: the positive and negative servo wires
are soldered to common pins, leaving two
pins for the two signal wires.
•The next step is to install the aileron linkages
in the outboard wing panels: glue the horns
in the ailerons using 5-minute epoxy, exactly
in line with the servo output arms. It is impor-
tant to position the linkage holes exactly over
the aileron hinge pivot axis.
•The pushrods themselves are assembled
from the pre-formed rods, threaded couplers
and plastic clevises provided; solder the
couplers securely to the pushrods. Alter-
natively 5-minute epoxy can be used, but in
this case the rods must be thoroughly
roughened and degreased beforehand.
•Once everything is installed and working
correctly, the servo well covers can be fitted:
carefully cut them out and fix them using
clear adhesive tape. Check repeatedly that
the servo well covers do not obstruct the
movement of the servo output arms.
•The outboard wing panels are plugged into
the centre section using the pre-formed steel
joiner rods. Secure each joint with a strip of
tape before every flight.
The fuselage
•The wing retainer screw engages in a
threaded sleeve which should now be glued
in the fuselage together with the plywood
spreader disc; these parts are installed in the
central hole, working from the inside. Use 5-
minute epoxy for this, and take care that no
glue runs into the threaded section.
•The V-tail linkages are installed next: glue
the former to the control ‘snakes’ as shown,
and glue this assembly in the tail boom.
Slide the snakes aft as far as possible. En-
sure that the former is positioned ‘squarely’
in the fuselage. Glue the assembly in the
boom by applying small quantities of 5-
minute epoxy to the joints using a long
screwdriver.

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•Locate the plywood plate for the V-tail ser-
vos, and glue it in the fuselage under the
wing saddle. Roughen the inside of the fuse-
lage thoroughly to provide a mechanical ‘key’
for the epoxy. Before installing the servo
plate install the servos temporarily, and mark
the correct height of the plate on the fuse-
lage sides.
•Screw the servos to the servo plate using the
retaining screws and rubber grommets sup-
plied in the servo accessory pack.
•Solder threaded couplers to one end of the steel pushrods, then screw a clevis on each coupler.
Slip the pushrods into the snake outers from the servo end, and connect the clevises to the servo
output arms.
V-tail
•Slide the V-tail panels onto the wire dowels
already bonded into the fuselage.
•The control surface horns take the form of
pre-formed steel rods with a linkage ball on
one end. Drill a 1.6 mm Ø hole in the root
face of each control surface to accept the
horns, taking care to keep the drill exactly
parallel with both sides of the panel.
•Thoroughly roughen the pre-formed steel
horns before gluing them in the V-tail control
surfaces. Check that both horns are at the
correct angle: the linkage balls must line up
exactly with the hinge pivot axis. Ensure that
the linkage balls do not foul each other when
the tail panels are in place on the fuselage.
•Now solder a threaded coupler to the tail end
of each steel pushrod before screwing the
ball-links onto the couplers. The ball-links
can easily be fitted and removed, making it
easy to remove the V-tail panels.
Installing the electric motor
•The first step here is to glue the GRP motor
bulkhead in the fuselage: screw the motor to
the bulkhead, and push this assembly firmly
into the fuselage nose from the inside. Set
the bulkhead exactly parallel to the front face
of the fuselage. Temporarily fit the propeller
on the shaft, and check that the spinner
backplate is parallel with the fuselage nose.
•Tack the bulkhead to the fuselage using thin
cyano, then remove the motor and reinforce
the joints with 5-minute epoxy.

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•You may need to sand back the front face of
the fuselage slightly to obtain an accurate
transition to the spinner backplate. Please
work slowly, removing material in small in-
crements, and your reward will be a perfect
transition.
•The motor can now be screwed in place
permanently, and connected to the speed
controller. Motor polarity must be correct: the
best method is to check that the motor spins
in the appropriate direction before installing
it. Prepare a small piece of hardwood by
drilling a small central hole in it, and push this onto the motor shaft to make it easier to detect the
direction of rotation. Do not use the propeller for this: injury hazard!
•Assemble and install the folding propeller, hub and spinner following the instructions provided by
the manufacturer.
•The speed controller can be attached to the fuselage side or under the battery plate using a small
piece of hook-and-loop tape. Secure the cables between controller and motor in such a way that
they cannot come into contact with the rotating parts of the motor. Don’t wrap the controller in
foam, as this prevents air flowing round it, and could cause it to overheat.
Final work
•Adjust the position of the flight battery to set the correct Centre of Gravity (65 - 76 mm aft of the
wing root leading edge). This range is safe for the initial test-flights. Later you may wish to adjust
the CG to suit your personal preference - but not by more than +/- 5 mm.
•Fix the battery in its final position using hook-and-loop tape, and mark its exact location to ensure
that it is in the same position for subsequent flights.
•Check the control surface functions, and set the travels as follows:
Rudder, right-hand turn: left surface 10 mm up, right surface 8 mm down;
Rudder, left-hand turn: left surface 10 mm down, right surface 8 mm up;
Up-elevator: both surfaces 10 mm up;
Down-elevator: both surfaces 10 mm down;
Ailerons, right-hand turn: right aileron 10 mm up, left aileron 5 mm down;
Ailerons, left-hand turn: right aileron 5 mm down, left aileron 10 mm up;
Landing position: both ailerons 15 mm up
both V-tail surfaces 3 mm down
The first flight
•Once you have completed all the checks, there is nothing to stop you carrying out the model’s first
flight. If you have little or no experience in model flying, we urge you to join a model flying club and
ask a proficient model pilot for assistance: he will carry out the initial test-flights for you, and then
help you to learn the art of model flying step by step.
•It is also possible to learn to fly without outside help: first wait for a day with little or no breeze.
Launch the model with a firm push forward into any wind, keeping the wings level and the nose
angled slightly above the horizontal. Allow the aircraft to climb at a shallow angle, initially using the
elevator only to adjust the rate of climb. Don’t let the model slow up too much. If it turns to one
side, gently move the rudder in the opposite direction to return to straight flight.
•Once the model is at a safe altitude, switch the motor off and allow it to glide. Use the controls
very gently at first until you feel familiar with the aeroplane’s response to commands. Don’t get

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over-confident too quickly, and maintain plenty of height at all times - model flying is a sophis-
ticated skill which needs to be learned - just like driving a car or riding a bike.
•Always land the model with its nose pointing directly into wind. Let it glide towards the ground at a
shallow angle, and don’t apply up-elevator until it is just about to touch down. Never carry out any
major corrections with the rudder when the model is close to the ground!
Safety notes, hazard warnings
•Model flying is a fascinating hobby. When you fly the model we recommend that you observe the
following basic rules, in order to avoid annoying or endangering anyone else.
•In Germany it is only permissible to fly the model using a 35 MHz or 2.4 GHz radio control system.
•Fly the model only at a site where you cannot cause a nuisance or endanger other people. It is
always best to use approved model flying sites.
•Never fly directly towards or above spectators, and do not carry out high-risk manoeuvres close to
other people.
•If any part of your radio control system needs repair, always entrust the work to the experts. Any
modifications to the system components invalidate your equipment’s official approval.
•Do not switch your transmitter on unless you are confident that it cannot cause interference to any
other radio control system in the vicinity; typically as a result of same-channel interference.
•If possible, join a model flying club. There you will find like-minded people who will be able to an-
swer all your questions and solve all your problems.
Please note: if damage ensues due to failure to observe these instructions, the guarantee is rendered invalid. We ac-
cept no liability for consequent damage which results from such actions. Please follow the building instructions to the
letter when completing and operating this model. The building instructions include information on safe flying. This
model is in no respect a children’s toy.
aero-naut Modellbau GmbH & Co KG, Stuttgarter Strasse 18-22, D-72766 Reutlingen, Germany
www.aero-naut.de