GRAUPNER CESSNA 172 S User manual

Order No. 9595
9595.M
Instructions
CESSNA
®
172 S
For two-stroke glow engines up to 7.45 cc capacity
or
four-stroke glow engines of 9.32 cc capacity
This model requires a five-function radio control system
Cessna® emblems, logos and body
designs are trademarks of Textron
Innovation Inc. and are used under
license by Graupner GmbH & Co. KG
Specification Wingspan approx. 1675 mm
Length approx. 1300 mm
Wing area approx. 37.4 dm²
Tailplane area approx. 8.6 dm²
Total surface area approx. 46 dm²
All-up weight according to fittings approx. 3450 gLongitudinal dihedral
0 - 0.5 degrees
Centre of Gravity, measured at
the root leading edge, approx. 80 - 85 mm
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 that all the kit components are actually present. We
have taken great trouble to keep construction as simple as possible, without making
any compromises in the area of safety.
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 trivial 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: Hold the panel twisted gently in the opposite direction to the warp,
and apply warm air to remove the creases from the covering.

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 working loose: just squirt white glue into the hole and fit
the screw.
Safety notes and warnings relating to model aircraft
powered by glowplug engines
•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 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 eighteen
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. Any other use of this model is prohibited.
•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 excellent sources of information.
•It is fundamentally essential to set the Centre of Gravity (C.G.) 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 materials 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 aircraft and engine.
•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 engine
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 lead 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 engines produce lethal carbon monoxide gas just
like full-size engines.
•Engines 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 generate a lot of heat. The engine and silencer in particular
become very hot when running, and stay at a high temperature 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 engine is running it expels hot toxic gases from the exhaust
together with very hot fluid combustion residues which can burn you if you
are not careful.
•Remove all unused fuel from the fueltank and engine 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 engines 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 engines are very noisy, producing a sound level much higher
than 85 dB (A), which implies that you should wear ear defenders. Never
run a engine without the silencer fitted. Even with a silencer, model engines
can easily disturb your neighbours. Don’t run engines when other people
expect peace and quiet.
•If you start your engine 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 engine running. Hold
the rotating parts well away from you!
•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 high-tension overhead cables.
•Whenever you are working on the engine, 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 aeroplane constantly while it is in the air. Models must always
give way to full-size aircraft.
•Don’t operate your aircraft from public roads, squares, school playgrounds,
public parks or sports grounds etc., and ensure that you are always in full
control of the model.
•It is important that you are able to stop your engine 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 end-points. If this does
not work, pinch the fuel feed line between your fingers or pull it off the
carburettor. Never try to stop the engine by grasping the flywheel, propeller
or spinner!
•All model flyers should behave in a manner which minimises the danger to
people and property. Never act in any way which will disturb other flyers
and jeopardise 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,
Legal Requirements and more) is available under Order No. 8034.02, and
contains a summary of all these rules. Your local model shop should have
a copy which you can read. Models fitted with glowplug engines 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.
•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.
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 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 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 please check that your private third-party
insurance covers the risks involved in operating models of this type. We recommend
that you take out a special policy to cover the risks of radio-controlled model aircraft.
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 conditions
The guarantee provides for the replacement of any parts which exhibit proven
manufacturing errors or material defects during the guarantee period of 24 months
from the initial date of purchase. We will not consider any claims which do not fall
within this description. Costs of transport, packaging, freight and journeys are

payable by the purchaser. We accept no liability for transport damage. Please send
the offending item to GRAUPNER or to the approved service centre for your country,
and include a concise, accurate description of the fault together with the dated
purchase invoice. The guarantee does not cover failure of any part of the model due
to an accident, incompetent handling, or incorrect use.
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.
•If you intend to use dry cells as a power supply, please note that they must never
be recharged. Only cells specifically marked as ‘rechargeable’ are safe to re-
charge.
•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 and checked before every
flight.
•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.
Pre-flight checks
Check that the radio control system is working correctly and at full range before every
flight: fit the transmitter aerial and extend it fully, then switch on the transmitter and
the receiving system. 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.
Repeat the check with the engine or engine running, while a friend holds the model
securely for you.
If you are a relative beginner to model flying, we recommend that you enlist the aid of
an experienced model pilot to help you check and test-fly the model.
•Clean the model carefully after every flight, and remove any dirt from the
propeller. Clean the aeroplane and the RC components using suitable cleaning
agents only. Ask your model shop for information if you are not sure.
•If the model is not to be operated 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; please 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.
•Deploy the receiver aerial as far away as possible (at least 3 cm) from any high-
current cables.
Additional items required
Glow engine and accessories
Engine
Order No.
Silencer
Order No.
Propeller
Order No.
OS MAX 46 AX
7.45 cc
2701
2715.33 28 x 15 cm
1318.28.15
OS MAX 46 Fxi
7.45 cc
2702
2715.33 28 x 15 cm
1318.28.15
OS MAX FS 56 α
9.32 cc
2729
2715.33 30 x 20 cm
1318.30.20
Radio control system
For this model you require at least a five-channel RC system with seven
servos. The transmitter should also feature a servo reverse facility.
We particularly recommend mc-22 to mc-24 computer systems. The model is
designed for standard-size servos.
We recommend the following receiver battery: GRAUPNER 4-2000 NIMH, Order No.
3415, which should be properly maintained before and after each flying session.
Please remember that the pack needs to be cycled (charged and discharged) several
times before it reaches full rated capacity.
The two aileron servo leads should be lengthened using extension leads, Order No.
3935.32; the landing flap servos should be extended using the leads, Order No.
3935.18. Wrap the connectors in tape or heat-shrink sleeves to prevent them working
loose.
For connecting the aileron and landing flap servos to the receiver you will need four
extension leads, Order No. 3935.18, which should be connected permanently to the
appropriate receiver sockets.
Foam padding for the receiver and receiver battery is included in the kit.
Standard-size servos can be used in this model.
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
Cellulose cement, e.g. UHU hart, Order No. 534.35
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 engine
Fuel filter, e.g. Order No. 1650.1
Fuel tubing, e.g. Order No. 1643
Manual fuel pump, e.g. Order No. 1610 or 6870
Glowplug energizer battery and clip, e.g. Order No. 3248
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, soldering iron, pencil, felt-tip pen, fine-tipped soldering iron.
Assembling the CESSNA
®
172 S
Please don’t start building the model until you have read right through the building
instructions and are familiar with all the airframe’s components and stages of
construction. If you are not satisfied with any part, inform your supplier before you
start work on the aircraft.
The first step is to glue the hinges half-way into the control surfaces. The following
photos show the elevators as an example, but the procedure is the same for all the
other panels: the best method is to push the hinges into the slots in the control
surfaces to a depth of about 1 mm, apply drops of cyano to both sides of each hinge,
then push them in to the half-way point.
Allow the glue to set hard, then offer up the control surface to the corresponding fixed
panel and check alignment; you may need to adjust the hinge slots slightly. When
you are satisfied, withdraw the control surface, leaving about 1 mm of the hinges still
inside the slots.
Apply a few drops of cyano to the hinges, as described earlier, then push them into
the slots, leaving an even gap about 0.5 mm wide along the hinge pivot line.
While the glue is hardening, press the rubber grommets and tubular metal spacers
into the servo mounting lugs, and screw them to the servo mounts; drill 1.5 mm Ø
pilot-holes for the retaining screws beforehand.
Fix the servos to the mounting blocks using the retaining screws supplied in the servo
accessory packs. Note that the rubber grommets should be fitted in the servo
mounting lugs first, followed by the metal spacers, with the flange on the underside.
The metal spacers can now be used as a drilling template for the pilot-holes. You will
find it easier to insert the spacers if you thread them onto a small screwdriver first.
The servo leads can now be drawn through the wings using the lengths of thread
already fitted in the panels: tie the thread just behind the connector and pull the lead
through in this way. Note that the extension leads must be fitted to the servo leads
first. Secure each connector with a heat-shrink sleeve or a drop of cyano to prevent
them working loose.

The next step is to install the landing flaps; start by temporarily taping them to the
wings.
The distance from the edge of each flap to the inboard hinge should be about 50 mm;
the distance to the outboard hinge should be about 35 mm. Tack each hinge to the
wing and flap with two drops of cyano, as shown in the photo. Now the holes for the
retaining screws can be drilled 1.5 mm Ø. Attach the hinges using the pan-head
screws supplied, but only tighten them to the point where the hinges can no longer
be shifted. Apply a drop of UHU coll (white glue) to each hole before fitting the
screws permanently.
Before installing the servos in the wing they must be set accurately to centre from the
transmitter. The servos should be installed in the wing panels as shown in the photo.
Drill a hole at the marked point for the aluminium threaded sleeve, then remove the
covering film from the control surface over an area the size of the sleeve’s flange. Fit
the machine screw in the threaded sleeve, set the end flush with the bottom of the
sleeve, then glue the sleeve in the hole in the control surface.
Connect the pushrod to the plastic horn lug. Mark the length of the pushrod, and
bend the plain end at right-angles at the marked point. Connect the pushrod to the
servo output arm and secure it with the plastic keeper.
Snip off the excess pushrod length, so that it projects by about 1 mm beyond the
keeper.
Locate the holes in the wing centre section for the aerials, the retaining screws and
the servo leads, and use a hot soldering iron to melt the covering film over them.
Push the wing centre section and the outboard wing panels together on the
aluminium joiner tube to the point where the servo leads and navigation light wires
can be threaded through the holes in the centre section. At this point the wing panels
can be glued together permanently. Apply adhesive tape over the panel joints as
shown in the photos, check alignment once more, then leave the glue to set hard.
Wipe off excess adhesive using a piece of paper towel.
Place the tail panels in position at the rear end of the fuselage, and position the
tailplane so that it is exactly central (measure each side) and forms a right-angle to
the fuselage centreline (when viewed from above). Check that the fin rests squarely
on the tailplane. With the panels in this position, use a felt-tip pen to mark the line of
the fuselage and fin on both sides of the tailplane. Remove the panels, and cut
through the film by running the tip of a hot soldering iron just inside the marked lines.
Peel off the superfluous film.
The main undercarriage is installed next: use your fingertips to locate the openings in
the underside of the fuselage, and melt the film over the holes using the tip of a hot
soldering iron.

Cut out the undercarriage cuffs (fairings) along the marked lines, and trim them to fit
snugly against the fuselage: this is accomplished by screwing the undercarriage legs
to the fuselage and slipping the cuffs over the legs and against the fuselage. You
may need to make minor adjustments to obtain a close fit.
The undercarriage cuffs are glued to the fuselage using UHU Kraftkleber.
Drill 4 mm Ø holes on the inboard side of each wheel spat at a point about 8 mm
from the bottom edge of the moulding, and equi-spaced from both ends of the wheel
opening. Mount the wheels and wheel axles on the undercarriage legs as shown in
the photos.
Assemble the noseleg unit, the steering arm and the plastic bracket as shown in the
photo. Note that the steering pushrod should be connected to the outer hole in the
steering arm.
The retaining screw for the nosewheel steering arm must be secured with a drop of
UHU schraubensicher (thread-lock fluid) to prevent it working loose.
Lay the engine on the arms of the engine mount, and mark the position of the holes
for the retaining screws. Note that the distance between the rear face of the mount
and the front face of the propeller driver should be about 115 mm. Drill the holes
accurately, using a size of bit to suit the retaining screws.
Place the engine mount on the fuselage firewall (nose bulkhead) and attach it using
the screws supplied. Apply UHU schraubensicher to the screws to prevent them
working loose.
Assembling and installing the fueltank
Cut a piece of silicone fuel tubing and push it onto the fueltank clunk pick-up. Push
the free end of the fuel tubing onto one of the tubes in the fueltank stopper, and
check that the pick-up will be able to move freely inside the tank without binding or
jamming when the stopper is in place. Now push the tank stopper, complete with
pick-up and pre-formed tubes, into the throat of the fueltank; ensure that one pre-
formed tube faces down (for filling the tank). The pipe facing up is the overflow (when
the tank is filled), and is later connected to the pressure nipple on the silencer. Cut
three pieces of silicone fuel tubing and push them onto the tubes where they exit the
fueltank. Mark the fuel lines using a felt-tip pen or coloured tape to indicate which is
the fuel feed, the filler and the pressure connection. Push the stopper over the tank
throat and tighten the cross-point screw to clamp the stopper in place. It is essential
to tighten the screw to the point where the tank is completely sealed.
Push the fueltank into the tank compartment behind the firewall, and pack pieces of
foam rubber round it to prevent it shifting in flight.
Note that the three fuel lines must exit the opening in the firewall, ready to be
connected at a later stage.
Fix the glow engine to the engine mount using the countersunk machine screws
supplied.
Attach the silencer to the engine using the retaining screws supplied with the
silencer.

At this point the marked fuel lines can be connected as follows: the overflow tube
should be connected to the pressure take-off nipple mounted on the silencer. The
fuel feed line (connected to the fuel pick-up in the tank) is connected to the nipple on
the carburettor. The fueltank filler tube can be passed out of a hole in the side of the
cowl.
Before the cowl can be installed, the various openings should be cut and filed out to
shape to clear the silencer, the needle valve, the glowplug, etc.
At this stage the model will stand stably on its undercarriage, and this is a good time
to glue the tail panels to the fuselage.
Place the tailplane in its saddle at the rear end of the fuselage, and position it so that
it is exactly central (measure left and right), and forms a right-angle to the fuselage
when viewed from above. Run a felt-tip pen along the underside of the tailplane to
mark the shape of the fuselage on the panel.
Remove the tailplane, and melt the covering film by running the tip of a hot soldering
iron about 2 mm inside the marked lines. Peel off the unwanted film from the
tailplane.
Glue the tailplane in its saddle, and prevent it shifting by pinning it in place until the
glue has set hard.
Remove the pins when the glue has set, place the fin on top and mark its outline on
the tailplane.
As described for the underside, mark the outline of the fin on the top surface of the
tailplane, and melt away the film using a hot soldering iron, running it along just inside
the marked lines. When gluing the fin in place ensure that it is installed exactly at
right-angles to the tailplane.
Press the rubber grommets and metal tubular spacers into the mounting lugs of the
rudder, elevator and throttle servos, as described at the start of the building
instructions. Fix the servos to the servo plate using the retaining screws supplied in
the accessory packs.
When the glue holding the tailplane and fin in place has set hard, drill holes for the
horns at the marked points in both elevators and the rudder. Install the horns in the
control surfaces as shown in the photos.
The M3 machine screws which serve as horn pillars must be secured with a drop of
UHU schraubensicher.

Screw the plastic horn lugs onto the M3 horn pillars, and set a lever length of about
23 mm for the rudder, and around 27 mm for both elevators. Slip the rudder and
elevator pushrods into the guide sleeves from the tail end of the fuselage; you will
need to melt the film over the pushrod openings with a hot soldering iron beforehand.
Connect the clevises to the plastic horn lugs. At the front end link the two elevator
pushrods using the DUO pushrod connector supplied in the kit (as shown in the
photo). Connect the pushrods to the servo output arms using swivel pushrod
connectors; you will need to drill out the linkage holes to 2 mm Ø beforehand.
When installing the swivel pushrod connectors ensure that they rotate smoothly,
without noticeable lost motion.
It is imperative to secure the grubscrews which clamp the pushrods in the swivel
connectors with a drop of UHU schraubensicher to prevent them working loose.
The ON / OFF switch can be mounted in the fuselage side, as shown in the photo.
The purpose of the smaller ON / OFF switch is to turn the two flashing diodes in the
wingtips on and off: the wires to the LEDs must be soldered in such a way that they
can be connected to the switch and the battery box supplied in the kit.
Pack the receiver battery and the battery box for the navigation light system in foam,
and stow them under the plate which supports the cabin seats. Glue the four seats to
the plate, arranged as shown in the photo. When the glue has set hard, install the
seat plate in the fuselage using four pan-head self-tapping screws.
File out semi-circular openings in both sides of the seat plate to clear the extension
leads (permanently connected to the receiver), so that the leads can be run up to the
wing saddle.
Assembling the CESSNA
®
172 S
To make it easier to connect the aileron and landing flap servos to the receiver, we
recommend that you permanently connect 180 mm long extension leads to the
appropriate receiver sockets (2, 5, 6 and 7).
Connect the aileron and flap servos to the extension leads, then place the wing on
the fuselage and engage the two plywood lugs in the slots in the front fuselage
former. The wing can now be fixed to the fuselage by fitting the two plastic screws at
the trailing edge. Don’t over-tighten the screws: turn them just to the point where the
wings make firm contact with the fuselage.
Attach the two wing struts to the fuselage and the wings using the plastic screws
supplied in the kit.
Balancing the CESSNA
®
172 S
Support the assembled model (fueltank empty) under both wing roots at a point
about 80 mm aft of the wing root leading edge. If the CG position is correct, the
model will hang level, with the nose inclined slightly down. If necessary, re-position
the receiver battery, or 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 sticks and
trims are in the neutral position; check this carefully before the first flight.

Control surface travels for normal flying
Ailerons 10 mm up, 6 mm down
Elevators 20 mm up, 20 mm down
Rudder 40 mm left, 40 mm right
Landing flaps take-off 8 mm down
landing 30 mm down
We recommend that you set the following Exponential values at the transmitter:
Aileron 30%
Elevator 20%
Rudder 50%
The 50% Expo on the rudder is particularly helpful when you are rolling the model.
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 both
elevators must deflect up (stick forward: elevators 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 engine should run to the full-throttle position, i.e. the
carburettor barrel should be fully open (back-stick: idle). We have found it best to
assign the landing flap function to a programmable three-position switch mounted on
the stick-top.
Now all that remains is to wish you every success and many enjoyable flights with
your CESSNA
®
172 S.
Yours - the team !