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Order No. 9384
9384.RC
9384.MX
SKY HERO II
Building instructions
For two-stroke motors of around 7.46 cc capacity
The model requires a four-channel radio control system
Specification
Wingspan approx. 1540 mm
Fuselage length excl. spinner approx. 1200 mm
Wing area approx. 59 dm²
All-up weight according to fittings approx. 2500 g
Longitudinal dihedral approx. 0 to + 0.5º
Caution: This model is not a toy!
If you are a beginner to this type of powered model, please ask an experienced model flyer for help and
support. If you attempt to operate the model without knowing what you are doing you could easily injure
yourself or somebody else. Please keep your safety and well-being in mind at all times.
Important: before you start construction
Even if you have already built a large number of RC models please read right through these instructions and
check all the kit components against the parts list. We have taken great trouble to keep construction as
simple as possible, without making any compromises in the area of safety.
Check that the radio control system works correctly and at full range before every flight: switch on the
transmitter and the receiving system, but leave the transmitter aerial collapsed. Walk away from the model,
and check that all the control surfaces work smoothly and immediately at an appropriate distance, and
deflect in the correct “sense” (direction) relative to the stick movements.
If you are a relative beginner to model flying, we recommend that you ask an experienced model pilot to help
you check and test-fly the model.
RC components and linkages must be installed when mentioned in the appropriate stage of construction.
Fitting these parts later will be more difficult, and could even be impossible.
If you are buying a radio control system for this model, check that the transmitter and receiver are suitable for
model aircraft, and bear the standard type-approval sticker.
The frequency bands used for radio control systems are shared by other radio equipment and radiofrequency apparatus, so we cannot guarantee that you will not suffer interference when using your system.
Certain countries may require you to pay for a licence to operate your radio control equipment. In Great
Britain no fee is payable to operate 35 MHz radio control equipment, but you should check with your local
authority for any by-laws restricting its use. This information may not apply to other countries.
Your local Post Office or model shop will be able to provide more information on this subject.
Note regarding the film covering
Minor creases or bubbles may develop in the film covering due to major fluctuations in weather conditions
(temperature, humidity etc.); in rare cases you may even find a slight warp in a component. These minor
faults are in the nature of film-covered built-up wooden structures, and can easily be corrected using a heat
gun, as commonly used for modelling.
Creases: blow warm air over the area and rub down with a soft cloth.
Wing warp
the creases from the covering.
: hold the panel twisted gently in the opposite direction to the warp, and apply warm air to remove
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Caution! do not heat the film more than is absolutely necessary. If the air or the iron is too hot, the
film may melt and holes may be formed.
This model is highly pre-fabricated and can be built in a very short time. However, the work which
you have to carry out is important and must be done carefully. The model will only be strong and fly
well if you complete your tasks competently - so please work slowly and accurately.
When self-tapping screws have to be screwed into wood, apply a little white glue to prevent them
shaking loose: just squirt white glue into the hole and fit the screw.
Safety notes and warnings relating to
model aircraft powered by glowplug motors
Be sure to read right through the instructions covering assembly and operation of your model before
you attempt to operate it for the first time.
These safety notes are an integral part of the building instructions. Please keep them and the
operating instructions in a safe place. If you ever dispose of the model, be sure to pass them on to
the new owner.
Powered model aircraft are very demanding and potentially dangerous machines, and call for a high
level of technical knowledge and skill from the operator, together with a responsible attitude.
Powered model aircraft are not suitable for young persons under 18 years of age.
Young people should only be permitted to operate this model under the instruction and supervision
of an adult who is aware of the hazards involved in this activity.
The operator of the model must be in full possession of his or her bodily and mental faculties. As
with car driving, operating a model aircraft under the influence of alcohol or drugs is not permissible
under any circumstances.
Radio-controlled model aircraft may only be employed for the purpose intended by the manufacturer.
They must never be used as man-carrying machines. We do not permit this model’s use in any other
way except as a model aircraft.
A radio-controlled model aircraft can only work properly and fulfil your expectations if it is built very
carefully and in accordance with the building instructions. Do not make any modifications of any
kind to the design features or materials. If you wish to avoid injuring people and damaging property
it is essential to be careful and painstaking at all stages of building and operating your model.
Nobody would climb into a full-size light aircraft and try to fly it without completing a course of
training first. Model flying is a skill which has to be learned in just the same way. We suggest that
you ask for help from an experienced model flyer, or join a model club or flight training school. Your
local model shop and the specialist magazines are an excellent source of information.
It is fundamentally essential to set the Centre of Gravity (CG) and control surface travels correctly.
Adjust the model until they are exactly correct.
• Radio control system: satisfy yourself that your frequency is vacant before you switch on. Check
your RC system regularly, as its components eventually wear and need to be replaced or
repaired. Radio interference caused by unknown sources can occur at any time without warning.
If this should happen, your model will be uncontrollable and completely unpredictable. Never
leave your radio control system unguarded, as other people might pick it up and try to use it.
Your RC system can only work reliably if the batteries are kept fully charged.
Don’t ignore our warnings. They refer to circumstances and situations which, if ignored, can result in fatal injury or permanent
damage.
You alone are responsible for the safe operation of your radio-controlled model and motor.
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If you have any questions regarding the safe operation of your RC model aircraft, please turn to your
local model shop in the first instance as the staff will be pleased to help you.
• Propellers and other rotating parts which are powered by a motor represent a permanent hazard,
and present a real risk of injury. Don’t touch them with any part of your body. For example, a
propeller spinning at high speed can easily slice off a finger.
• Keep well clear of the rotational plane of the propeller. You never know when some part may
come loose and fly off at high speed, hitting you or anybody else in the vicinity. Never touch the
revolving propeller with any object.
• Take care with loose clothing such as scarves, loose shirts etc. Flapping cloth can easily be
sucked into the area of the propeller and then get tangled in the blades. This is extremely
dangerous.
• If there are passers-by or spectators at your flying site, make sure that they are aware of the
dangers inherent in your activity, and insist that they keep a safe distance away (at least 5 m).
• Radio-controlled models should only be flown in “normal” weather conditions, i.e. a temperature
range of -5° to +35° C. More extreme temperatures can lea d to changes in battery capacity,
material characteristics and other unwanted effects.
• Model fuels are toxic; do not allow them to come into contact with your eyes or mouth. Fuel
should always be stored in clearly marked containers, out of the reach of children.
• Never run an internal combustion engine in an enclosed space such as a cellar, garage etc.
Model motors produce lethal carbon monoxide gas just like full-size engines.
Motors should only be run in the open air!
• Adhesives and paints contain solvents which may be hazardous to health under certain
circumstances. Read and observe the notes and warnings supplied by the manufacturer of these
materials.
• Model fuels are volatile and highly inflammable. Keep them well away from open flames,
excessive heat, all possible sources of sparks and anything else which could result in a fire. Do
not smoke in the immediate vicinity of fuel or fuel vapours.
• Model engines produce a lot of heat. The motor and silencer in particular become very hot when
running, and stay so for quite a while. Touching the hot parts can give you serious burns, so take
care especially when carrying out adjustments - wear protective gloves. Hot engines can even
start a fire under certain circumstances.
• When the motor is running it expels hot toxic gases from the exhaust together with very hot fluid
combustion residues which can burn you.
• Remove all unused fuel from the fueltank and motor after every session.
• Every time you intend to operate your model check carefully that it and everything attached to it
(e.g. propeller, linkages, control surfaces etc.) is in good condition and undamaged. If you find a
fault, do not fly the model until you have corrected it.
• Model motors are usually started with the help of an electric starter which should be fitted with
the appropriate adaptor where necessary. With fixed-wing models an alternative is to use a
“chicken stick” - a length of thick wooden dowel with a piece of water hose pushed over it.
• Many model motors are very noisy, producing a sound level much higher than 85 dB (A), which
implies that you should wear ear defenders. Never run a motor without the silencer fitted. Even
with a silencer, model engines can easily disturb your neighbours. Don’t run motors when other
people expect peace and quiet.
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• If you start your motor when the model is standing on loose or sandy ground, the propeller will
suck up sand and dust and hurl it around, and it could easily get in your eyes and do damage.
Wear protective goggles at such times.
• Take care that the glowplug clip and the glow lead cannot get tangled in the propeller or other
rotating parts. Check the throttle linkage too.
• Take particular care when carrying the model with the motor running. Keep well clear of the
rotating parts!
• Be sure to keep an adequate supply of fuel in the tank. Don’t continue to fly the model until the
tank is drained dry.
• Never fly directly over people.
• Never fly directly towards people.
• Keep a safe distance from residential areas: at least 1.5 km “as the crow flies”. The best solution
is to join a model flying club and use the approved flying site. Always keep well clear of hightension overhead cables.
• Whenever you are working on the motor, make sure that you are on a safe surface and cannot
slip. Get used to holding the model really securely.
• Take-off and landing strips should be kept free of unauthorised people and movable obstacles,
particularly when a model is using the strip.
• Watch the model constantly while it is in the air. Models must always give way to full-size aircraft.
• Don’t operate your model from public roads, squares, school playgrounds, public parks or sports
grounds etc., and ensure that you always have the model under control.
• It is important that you can stop your motor at any time. This is achieved by adjusting the throttle
so that the barrel closes completely when you move the throttle stick and trim to their endpoints. If this does not work, pinch the fuel feed line between your fingers or pull it off the
carburettor. Never try to stop the motor by grasping the flywheel, propeller or spinner!
• All model flyers should behave in such a way that the danger to people and property is
minimised. Never act in any way which will disturb other flyers and prevent safe, orderly flying at
the site.
In legal terms our models are classed as aircraft, and as such are subject to legal regulations and
restrictions which must be observed.
Our brochure “Modellflugrecht, Paragrafen und mehr” (Model Aviation Law, Articles and More) is
available under Order No. 8034.01, and contains a summary of all these rules. Your local model shop
should have a copy which you can read. Models fitted with glowplug motors may only be flown with
the landowner’s permission, and third party insurance is mandatory. There are also Post Office
regulations concerning your radio control system, and these must be observed at all times.
Please don’t misunderstand the purpose of these notes. We only want to make you aware of the
many dangers and hazards which can arise if you lack knowledge and experience, or work carelessly
or irresponsibly. If you take reasonable care, model flying is a highly creative, instructive, enjoyable
and relaxing pastime.
Important safety notes
You have acquired a kit which can be assembled into a fully working RC model when fitted out with
suitable accessories. However, we as manufacturers have no control over the way you build and
operate your RC model aircraft, nor how you install, operate and maintain the associated
components, and for this reason we are obliged to deny all liability for loss, damage or costs which
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are incurred due to the incompetent or incorrect use and operation of our products, or which are
connected with such operation in any way. Unless otherwise prescribed by binding law, the
obligation of the GRAUPNER company to pay compensation, regardless of the legal argument
employed, is excluded. This includes personal injury, death, damage to buildings, damage due to
loss of business or turnover, interruption of business or other direct or indirect consequent damage
whose root cause was the operation of the model.
The total liability in all cases and under all circumstances is limited to the amount of money which
you actually paid for the model.
This model is built and flown at the sole and express responsibility of the operator. The only way to
avoid injury to persons and damage to property is to handle and operate the model with the greatest
care and consideration at all times.
Before you fly the model for the first time you must check whether your private third party liability
insurance policy covers you for operating model aircraft of this type. If you are not sure, take out a
special policy designed to cover modelling risks.
These safety notes must be kept in a safe place. If you ever dispose of the model, be sure to pass
them on to the new owner.
Guarantee terms
The guarantee covers replacement of any parts which can be shown to exhibit manufacturing faults or
material defects within the guarantee period of 24 months from the initial date of purchase. No other claims
will be considered. Cost of transport, packing and freight are payable by the purchaser. We accept no liability
for damage in transit. When you send the product to GRAUPNER, or to the approved Service Centre for your
country, you must include a clear and concise description of the fault together with the invoice showing the
date of purchase. The guarantee is invalid if the component or model fails due to an accident, incompetent
handling or incorrect usage.
The following points are important and must be observed at all times:
• Before you fly the model check that the radio control system is working reliably, and that all connections
are secure.
• The batteries must be charged and the range of the radio control system must be checked before you
operate the model. In particular, the radio control system batteries must be fully charged before each
session.
• Ensure that the channel you intend to use is not already in use by other modellers. Never fly the model if
you are not certain that your channel is free.
• Read and observe the instructions and recommendations provided by the manufacturer of your radio
control system and accessory components.
• Ensure that the servos are not mechanically obstructed at any point in their travel.
• Dry cells and rechargeable batteries must never be short-circuited.
• Remove all batteries from the model prior to transporting and storing it.
• Do not subject the model to dirty or cold conditions, or high levels of humidity or heat.
• Secure the model and your RC equipment carefully when transporting them. They may be seriously
damaged if they are free to slide about.
Care and maintenance
• Clean the model carefully after every flight, and remove any dirt from the propeller. Clean the model and
RC components using suitable cleaning agents only. Ask your model shop for information.
• If the model is not to be run for a considerable time it is important to clean and re-lubricate all the moving
parts.
Notes on completing the model
• Before building the model it is important that you read the instructions right through to the end. Tools can
be dangerous; be aware of the hazards involved in using them.
• Use cable of adequate cross-section, capable of carrying the currents which will flow when the model is
flying.
• Before making any glued joints, be sure to clean the surfaces and remove all traces of grease. We
recommend sanding lightly, or wiping with a non-greasy cleaning agent. The same applies to surfaces to
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be painted, otherwise the paint is unlikely to adhere well. Before gluing parts to the fuselage it is
essential to roughen the surfaces with fine abrasive paper and de-grease them with acetone or similar
solvent, otherwise you will not obtain strong, durable joints. This applies in particular to moulded GRP
fuselages.
Additional items required
Motor and accessories
Motor Silencer or Silencer Propeller
Order No. Order No. Order No. Order No.
1888 1885.33 1870.72 1316.25.18
2701 2701.33 1870.72 1318.28.15
2702 2701.33 1870.72 1318.28.15
Radio control system
For this model you require a four-channel RC system and four servos. The transmitter should also
feature a servo reverse facility.
We particularly recommend: X-412 to mc-24 computer systems. The model is designed for standard-size
servos, e.g. 4041, Order No. 3916.
We recommend the following receiver battery: SANYO AE-1400 AE, Order No. 2524, which should be
properly maintained before and after each flying session, i.e. the pack needs to be cycled (charged and
discharged) several times before it reaches full rated capacity.
For connecting the aileron servo to the receiver you will need a suppressor filter, Order No. 1040. You will
also require foam material for protecting the receiver and battery, e.g. foam rubber, Order No. 1637.
Adhesives
Fast-setting epoxy resin, e.g. UHU plus schnellfest, Order No. 962
Slow-setting epoxy resin, e.g. UHU plus endfest 300, Order No. 950.15
White glue, e.g. UHU coll, Order No. 958.60
UHU hart (cellulose cement), e.g. Order No. 534.10
Cyano-acrylate glue (“cyano”), e.g. Order No. 5821
Thread-lock fluid, e.g. Order No. 952
Accessories for flying the model (not included)
Synthetic oil based glow fuel, to suit motor
Fuel filter, e.g. Order No. 1650.1
Fuel tubing, e.g. Order No. 1643
Manual fuel pump, e.g. Order No. 1610
Glowplug energizer battery and glowplug clip, e.g. Order No. 3253
Electric starter, e.g. Order No. 1628
Starter battery, e.g. Order No. 2592
Tools required (not included)
Various (cross-point) screwdrivers, pointed-nose pliers, flat-nose pliers, side-cutters, balsa knife or razor
blade, set of twist drills, universal glowplug spanner, Z-bend pliers, Order No. 5732.
Don’t start building the model until you have read right through the building instructions and are familiar with
all the model’s components. If you are not satisfied with any part, inform your supplier before you start work
on the model.
Assembling the SKY HERO II
Joining the wing panels
Temporarily fit the two wing panels together on the dihedral brace, and check that the root ribs line up
correctly. Mark the centreline on the dihedral brace using a pencil, so that it is inserted to the same depth in
both wing panels.
Do not glue the wing panels together until you have completed this check.
The wings should be glued together using UHU HOLZ D3 (waterproof wood glue) or UHU plus endfest 300
(24-hour epoxy).
Mix up the resin and hardener according to the instructions on the adhesive packaging (epoxy only). Apply
plenty of epoxy to the inside of the dihedral brace slot in the left-hand wing panel. Apply epoxy to one half of
the dihedral brace and push it into the wing panel as far as the pencil mark. Apply a thin coating of epoxy to
the root rib of the right-hand wing panel and the projecting end of the dihedral brace. Apply plenty of epoxy to
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the brace socket of the right-hand wing.
Now slide the two wing panels together and ensure that the root ribs meet snugly, without gaps. Check that
the wings are not twisted relative to each other. Wipe off excess epoxy on a piece of kitchen paper
Tape the panels together, and allow the epoxy to cure.
It is essential that the two wing panels should be joined with positive dihedral, i.e. when one panel is
resting flat on the building board, the other tip should be about 30 mm above the surface.
The strip of white self-adhesive plastic can now be applied over the joint line.
Installing the aileron servo
Press the rubber grommets (supplied with the servo) into the servo mounting lugs. Push the brass tubular
rivets into the rubber grommets from the underside, so that the flange is at the bottom. You may find it easier
to insert the tubular rivets if you fit them on a small screwdriver first.
Lay the aileron servo plate on the wing in the correct position, and draw round it lightly using a soft pencil.
Melt the film along the marked line using a hot soldering iron, then carefully peel the film away from the
wood.
Sand the wing flat over the exposed area using a sanding block, then glue the aileron servo plate to the wing
using UHU Holz D3 glue.
When the glue has set hard, place the aileron servo in the opening and drill 1.5 mm Ø pilot-holes for the
retaining screws.
Fix the servo to the plate using the screws supplied with the servo.
Screw a plastic clevis onto the threaded end of each aileron pushrod. The end of the rod should be visible
between the jaws of the clevis, as shown in the photo.
Cut down the servo output device as shown, drill out the linkage holes using a 2 mm Ø bit, and mount the
pushrod connectors using self-locking nuts. Set the aileron servo to neutral from the transmitter, then mount
the output lever on the servo.
Locate the aileron torque rods (projecting from the wings), and screw the lugs onto the threaded ends until
about 3 mm of rod shows at the top; this should give a horn length of about 20 mm. Connect the clevises to
the torque rod lugs and snap them shut. Push rings of silicone fuel tubing along the pushrods and over the
clevises to secure them. Cut the pushrods to length, slip the plain ends through the pushrod connectors, and
fit the M3 grubscrews. Tighten the M3 grubscrews lightly, then set the ailerons exactly to neutral (in line with
the wing airfoil) before tightening the grubscrews fully. Secure each with a drop of thread-lock fluid. Ensure
that the servo output lever is parallel to the wing trailing edge.
Gluing the tailplane and fin to the fuselage
Use a soldering iron to remove the covering film over the slots for the fin and tailplane at the tail end of the
fuselage.
This is done by locating the slots with your fingertips, pushing the tip of the soldering iron through and
running it along the edge of the slots until all the film has been melted away.
Slide the tailplane and fin into their slots. Adjust the position of the tailplane until it projects by exactly the
same length on both sides, and is at right-angles to the fuselage centreline when viewed from above. Now
mark the outside shape of the fuselage on the tail panels using a felt-tip pen.
Melt the covering film along the marked lines by running a soldering iron lightly along a steel ruler. Keep
slightly inside the lines, and peel the film away from the wood.
Fit the tail panels in the fuselage slots again, align them carefully and glue them in place. We recommend
UHU Holz D3 glue for this. Align the parts carefully as described earlier: the fin must be at right-angles to the
tailplane. This can be checked using a setsquare. Use pins to hold the parts in place while the glue is drying.
Fitting the control surface horns
The horns should be screwed to the control surfaces in such a position that the linkage hole for the clevis is
exactly in line with the hinge pivot axis, i.e. at right-angles to it. Drill holes for the retaining screws through the
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control surfaces.
Connect the clevis on one of the long pushrods to the rudder horn (second hole from the outside), then slip
the pushrod into the guide tube. Screw the horn to the rudder, then file back the excess screw length flush
with the spreader plate.
The elevator horn must be bevelled slightly as shown in the photo, to obtain proper clearance. Attach it to the
elevator as described above.
[ bevel ]
Installing the undercarriage
You will find a channel on the underside of the fuselage to accept the undercarriage. Locate it using your
fingers (as described for the tailplane and fin slots) and melt away the film using a soldering iron. Fit the
undercarriage units in the channel, and position the saddle clamps over them. Drill pilot-holes for the
retaining screws and fit the screws to secure the undercarriage.
Fit the wheels on the undercarriage, and secure each with two collets. The outer collet should be fitted flush
with the end of the axle.
Installing the noseleg unit
The noseleg and steering arm are installed together: connect the pre-formed end of the steering pushrod to
the noseleg steering arm, then slip the pushrod into the guide tube. The inboard end fits through the crosshole in the pushrod connector on the rudder servo output arm. Install the noseleg unit as shown in the photo.
Tighten the clamping screw in the steering arm, taking care to engage the screw on the machined flat in the
wire.
The wheel can now be mounted on the axle using the collets provided. Ensure that the wheel is centred on
the pivot line of the noseleg bracket.
Installing the servos in the fuselage
Press the rubber grommets (supplied with the servos) into the servo mounting lugs. Push the brass tubular
rivets into the rubber grommets from the underside, so that the flange is at the bottom. You may find it easier
to insert the tubular rivets if you fit them on a small screwdriver first.
Place the servos in the servo plate in the fuselage, drill 1.5 mm Ø pilot-holes and secure them using the
screws supplied with the servos.
Cut down the cruciform servo output devices as shown in the photo. Drill out the linkage holes using a 2 mm
Ø bit: the outermost hole (lever length 13 mm) for the rudder and elevator, the inner hole for the steerable
nosewheel. Mount the pushrod connectors on the output arms; check that they rotate smoothly, but without
slop.
Pushrod connector mounting
Set the servos to centre from the transmitter, then fit the output arms on them, slipping the pushrods through
the cross-hole in the pushrod connectors at the same time. Hold the control surfaces at neutral as you
tighten the M3 grubscrews in the connectors, and lock each with a drop of thread-lock fluid.
Rudder / nosewheel servo On / Off switch
Elevator servo Throttle servo
Installing the switch in the fuselage
The switch should be mounted in the left-hand fuselage side in a position such as that shown in the picture.
Cut a rectangular hole in the fuselage side to suit the switch, install the unit and fit the retaining screws. If
you are using woodscrews, glue small pieces of plywood or spruce strip on the inside of the fuselage to
prevent the screws shaking loose.
Assembling and installing the fueltank
One of the tubes inside the fueltank must be angled towards the top of the tank, the other to the bottom. If
you heat the tubes gently with a heat-gun and bend them carefully they will take up a smooth curve (see
photo); take care not to kink the tubes, as this would obstruct the fuel flow. Push a length of blue silicone fuel
tube (about 90 mm long) onto the fuel clunk pick-up.
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Check that the clunk will be able to move freely inside the tank without binding or jamming when the stopper
is in place. It must not touch the back of the tank when held vertically.
The tube for the overflow must extend right to the top of the tank, while the filler tube must reach the bottom.
Push short pieces of silicone tubing onto the tubes to achieve this.
Now push the tank stopper over the neck of the fueltank and clamp it in place by tightening the cross-head
screw through the front spreader plate. It is important to tighten the screw to the point where the tank is
completely sealed.
Cut three pieces of silicone fuel tubing and push them onto the tubes where they exit the fuel stopper. Mark
the fuel lines as follows:
clunk pick-up = fuel feed
tube angled up = overflow
tube angled down = filler / drain
Fit the fueltank into the fuselage through the wing saddle, threading the three silicone fuel tubes through the
hole in the nose bulkhead. The tank should rest against the rear of the motor bulkhead.
Screw a strip of plywood across the fuselage sides behind the fueltank, resting against the former, to ensure
that it cannot shift backwards in flight.
Installing the glowplug motor and silencer
These instructions only cover the method of installing the OS MAX FXI motor; however, the procedure is
exactly the same if you are fitting an OS MAX LA 46 or OS MAX 46 AX motor.
Place the glow motor on the motor mount, and check that the mounting lugs rest squarely on the mount
arms. Now slide the motor back (towards the tail) to the point where the needle valve is centred in the notch
prepared for it. With the motor in the correct position, mark the location of the holes for the retaining screws
on the motor mount, using a size of drill which fits snugly through the holes in the mounting flanges. Twist the
drill in your fingers so that it makes a clear mark.
Drill 2.8 mm Ø holes in the motor mount arms to accept the motor retaining screws (3.5 x 25 mm
countersunk screws).
The next step is to screw the glow motor in place, but not before connecting the throttle pushrod to the
carburettor arm.
Attach the silencer to the motor using the retaining screws supplied with it. Mount the propeller and spinner
on the motor.
Connecting the fuel lines
Locate the silicone fuel line attached to the fueltank clunk weight (fuel feed) and connect it to the carburettor
inlet nipple. Connect the overflow line to the pressure nipple on the silencer.
The filler line must be sealed with a sealing nipple, Order No. 140 or 140.1, before every flight.
When filling the fueltank take care not to allow excess fuel to run into the silencer.
Assembling the SKY HERO II
Locate the four holes in the fuselage sides as previously described, and melt away the covering film over
them. Push the wing retainer dowels through the holes.
To connect the aileron servos to the receiver we recommend that you plug a suppressor filter, Order No.
1040, into the appropriate receiver socket (2).
Wrap the receiver battery in foam and push it into the space under the fueltank inside the fuselage. Connect
the aileron servo to the extension lead and fit the wing on the fuselage: use four rubber bands on each side
to secure it. It is important to check the condition of the rubber bands at regular intervals, as they will
eventually perish. Always fit new ones if you are not sure.
Balancing the SKY HERO II
Support the model under both wing roots at a point about 75 - 82 mm aft of the wing leading edge. If the CG
position is correct the model will hang level, with the nose inclined slightly down. If necessary glue lead
ballast to the nose or tail to obtain the correct balance. All the control surfaces must be exactly at centre
when the transmitter trims and sticks are in the neutral position. Be sure to check this before the first flight.
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Control surface travels
Ailerons 10 mm up, 10 mm down )
Elevator 11 mm up, 11 mm down ) 30% exponential
Rudder 22 mm right, 22 mm left )
The stated travels are only our recommendation; you may wish to adjust them to suit your personal flying
style.
Important:
When fitting and adjusting the various linkages you should ensure that they move freely, without binding, are
able to move to their full extent - including trim travel - and are not obstructed mechanically at any point.
When you move the rudder stick to the right, the rudder should also deflect to the right (left stick: left rudder).
Pull the elevator stick back towards you, and the elevator must deflect up (stick forward: elevator down). If
you move the aileron stick to the right, the right aileron should rise, the left aileron fall. When you move the
throttle stick forward, the motor should run to the full-throttle position, i.e. the carburettor barrel should be
fully open.
Finally - we hope you have many hours of fun and pleasure flying your SKY HERO II.
Yours - the Graupner team
GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
We reserve the right to introduce modifications. No liability for printing errors. 10/2005
Made in Vietnam
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