TAXI 2400 - Graupner

Instructions
TAXI 2400
For petrol or glowplug engines of up to 26 cc capacity
or
GRAUPNER COMPACT 650
The model requires a six-channel radio control system
Specification
Wingspan approx. 2390 mm
Overall length approx. 1170 mm
Wing area approx. 105 dm²
All-up weight according to fittings approx. 7400 g
Longitudinal dihedral 0 to + 0.5º
1
to Order No. 9378
9378.M
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.
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: 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 shaking loose: just squirt white glue into the hole and fit the screw.

Safety notes and warnings relating to
model aircraft powered by petrol and 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 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 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. Please take the trouble to 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 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 an 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.
2

• 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 temperat ures 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 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 engine 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 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 aeroplane 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 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.
• 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.
3

• Take particular care when carrying the model with the engine 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 high-tension 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 people and movable obstacles,
particularly when a model is using the runway.
• Watch the model constantly while it is in the air. Model aeroplanes must always give way to
full-size aircraft.
• Don’t operate your model from residential areas, 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 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 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 “Luftrecht für Modellflieger” (Aviation Law for Model Flyers) is available under
Order No. 8032, and contains a summary of all these rules. Your local model shop will have a
copy which you can read. Models fitted with internal combustion 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 aircraft 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.
4

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 and under all circumstances is limited to the amount of money which you
actually paid for the model.
This model aeroplane 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.
• If you are using dry batteries as an energy source, note that they must never be recharged. Only
batteries marked specifically as ‘rechargeable’ may be recharged safely.
• It is essential to charge the batteries and check the range of your radio control system 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.
Pre-flight checks
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.
Repeat the checks with the motor running, while a friend holds the model firmly for you.
If you are a relative beginner to model flying, we recommend that you enlist an experienced model
pilot to help you check and test-fly the model.
5

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.
Use the parts list constantly as an aid to construction. The instructions and parts list reflect the
sequence of assembly.
• 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.
• Install the receiver aerial well away from any high-current leads (min. distance 3 cm).
• 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 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
Engine and accessories
Engine
Order No.
OS MAX 160 FX
1923
OS MAX FS 120
SURPASS
four-stroke
1886
OS MAX FS 120
SURPASS-E
four-stroke
1848
OS MAX FT-160
1412
G26
petrol engine
1903
Capacity Silencer Propeller
cc
Order No. Order No.
26.23 1839.33 38 x 20 cm
1318.38.20
19.96 1886.33 36 x 15 cm
2960.36.15
19.96 1886.33 36 x 15 cm
2960.36.15
2 x 13.26 2x1499.33 45 x 20 cm
2960.45.20
26 1556 45 x 20 cm
2960.45.20
6
Manifold
Order No.
Not required
Included
with silencer
Included
with silencer
1001.145
2 x required
1556.2 with
Teflon hose
1556.3 and
spring
clamps
1556.4
Radio control system
For this model you require a six-channel RC system with eight 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 standardsize
servos.
We recommend the following receiver battery: SANYO 4KR-1800 SCE, Order No. 3201, 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 two aileron servos to the receiver you will need two suppressor filters, Order No.
1040, or a folding ferrite ring, Order No. 98516, plus two extension leads, Order No. 3935.11.

Extension leads required:
Servo No. off Order No.
Aileron servo 2 leads 3935.50
Landing flap servo 2 leads 3935.18
Elevator servo 2 leads 3935.105
Throttle servo 1 lead 3935.32
For connecting the extension leads to the receiver: four extension leads, 3935.11.
Foam padding for packing round the receiver and battery: included in the kit.
The model is suitable for standard-size servos, e.g. Order No. 3916.
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
White glue, e.g. UHU coll, Order No. 958.60
UHU hart (cellulose cement), e.g. Order No. 534
Cyano-acrylate glue (“cyano”), e.g. Order No. 5821
Thread-lock fluid, e.g. Order No. 952
Accessories for flying the model with a glow motor (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. 3252
Electric starter, e.g. Order No. 1628
Starter battery, e.g. Order No. 2592
Accessories for flying the model with a petrol engine (not included)
Fuel (see engine operating instructions)
Fuel filter, e.g. Order No. 1646
Fuel tubing, e.g. Order No. 1325.2
Fuel pump, e.g. Order No. 6870
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 or felt-tip pen.
Assembling the TAXI 2400
Please 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.
Work on the wing panels
This is limited to installing the servos and linkages in the wing panels, and attaching the landing flap
hinges.
Remove one side of the double-ended servo output levers using side-cutters, and sand the cut edges
smooth, as shown in the photo.
Use your fingers to locate the slots in the servo plates and the holes in the underside of the wing
panels close to the root ribs, and melt away the covering film using a hot soldering iron. The servo
extension leads can now be threaded through the wing. Each of the procedures described below
should be repeated with the second wing panel.
Set the aileron servo to centre from the transmitter, i.e. connect the servo, receiver battery and switch
harness to the receiver, then switch on the transmitter and receiver. Check that the trims are at centre.
The servo is now at neutral (centre).
Attach the servo to the mounting blocks using the retaining screws supplied with it. Remember to
press the rubber grommets and brass tubular spacers (flange at the bottom) into the mounting lugs
beforehand. Drill pilot-holes for the screws, working through the tubular spacers. You will find it easier
to fit the metal spacers if you thread them onto a screwdriver first.
7

The servo extension leads can now be drawn through the wing panels. First connect the servo cable
to an extension lead, and secure the connection using a heat-shrink sleeve (supplied).Tie a length of
thread to the lead close to the plug, and use it to pull the wire through the wing panel.
Place the servo plate in the recess in the wing, with the servo output arm facing the wingtip.
Drill pilot-holes in the four corners of the servo plate, and secure it using four self-tapping screws.
Position the horn on the aileron so that the pushrod runs parallel to the servo; the linkage hole of the
horn should also be at right-angles to the hinge pivot axis of the aileron. Drill pilot-holes through the
aileron for the retaining screws. Tack the horn to the aileron in the correct position with a drop of
cyano.
The horn can now be attached to the aileron using the M2 x 30 pan-head screws and spreader plate
supplied.
Adjust the length of the horn so that the linkage hole is about 20 mm above the aileron.
Cut off excess screw length using side-cutters, and sand the cut ends back flush with the spreader
plate. Repeat the process with the M3 hex-head bolt which forms the horn column.
Each aileron pushrod consists of an M3 clevis, an M2.5 clevis and a length of M2.5 studding (threaded
rod). The length of the pushrod is dictated by the position of the servo and the horn.
Screw an M2.5 clevis onto the threaded rod (M2.5 x 80 mm), and connect it to the servo output arm.
Connect the M3 clevis to the horn, set the aileron and servo to neutral, and mark the correct length of
the pushrod. Cut the rod to length.
Fit the M3 clevis on the threaded rod and solder the joint.
The landing flap linkages can be installed using the same procedure as for the ailerons, except that
the horns have to be attached to the front face of the flaps, and the hinges are mounted externally, as
shown in the photos.
When mounting the flap servos on the servo plates please note that the servo output arms must face
inward, instead of projecting out of the plates.
The next step is to install the flap hinges. First tape the flap to the wing (important: the flap must be at
neutral, or even slightly negative (up)). Align the hinges carefully using the edge of a ruler, as shown in
the photo, then mark the position of the screw-holes on the wing. Drill the holes as accurately as you
can.
Three hinges are required for each landing flap. The exact position of the flaps is dictated by the
hardwood reinforcements in the flaps and wings.
The location of the flap horn is dictated by the position of the servo in the wing. Drill a 6 mm Ø hole at
the appropriate point (centre of the front face of the flap).
Screw the aluminium horn into the hole to the point where the distance between the linkage hole and
the front face of the flap is 11 mm.
Assemble the flap pushrod as described for the ailerons. The servo output arm and pushrod should be
adjusted so that the flaps can be deflected to maximum travel.
The servo can now be mounted in the wing using the servo mounts supplied.
Connect the clevis to the flap horn and adjust it so that the servo is not stalled, i.e. draws no current,
when the flap is fully retracted.
Installing the elevator servos in the tailplane panels
The elevator servos are installed in the tailplane panels as described for the aileron servos.
Locate the opening for the servo plate with your fingers, and melt away the film using a hot soldering
iron.
Fit the servo in the mounts, assemble the pushrod and install the mount in the tailplane panel. Repeat
with the second tailplane panel.
As with the wings, the location of the elevator horn is dictated by the position of the servo output arm.
The horn should be fitted with the linkage hole at right-angles to the elevator hinge pivot axis.
Install the horn and pushrod as shown in the photos.
8

The tailplane panels are held against the fuselage by a retainer system, for which the M6 knurled nuts
must be glued in the root face of both panels. Adjust the yoke and wedge of the retainer so that the
root ribs are held firmly against the fuselage when the retainer is fully engaged.
Installing the fin
To fit the fin you must first melt away the covering film over the slot in the fuselage. Locate the slot
with your fingers and run a hot soldering iron along the edges.
Slide the fin into the slot, and mark a line along the outside contour of the fuselage with a felt-tip pen.
Remove the covering film just inside the marked lines using a soldering iron, and peel the film away
from the wood.
Apply glue to the fin and the slot, then slide the fin into place; either UHU coll (white glue) or UHU
endfest (slow-setting epoxy) can be used for this joint. Check that the fin is exactly vertical, and pin it
in position while the glue is setting.
Installing the tailwheel unit
The steerable tailwheel unit is attached to the underside of the tail end of the fuselage using two panhead
self-tapping screws.
The steerable tailwheel is operated by means of braided steel cables. Drill and file out two slots in the
underside of the fuselage, following the dimensions stated in the photo, and glue pieces of plastic
sleeve in them to guide the steering cables.
Crimp the steel cables to the tailwheel steering arms and the rudder horns as shown in the photos,
and solder the cables on both sides of the aluminium crimp sleeves. The two rudder horns are
attached to the rudder using three M2 screws and three self-locking nuts.
Bundle together the pairs of steel cables from the rudder and tailwheel unit, and crimp them to single
clevises at the rudder servo.
Mount the receiver, receiver battery and ignition battery (petrol engine only) on the plate as shown in
the photo.
Installing the main undercarriage units
Attach the undercarriage units to the fuselage using the retaining screws supplied.
Apply a drop of UHU thread-lock fluid to the screws to prevent them shaking loose.
Drill the holes for the wheel axles in the wheel spats (note that the spats are handed, i.e. different left
and right).
The hole in the outside of the spat must be drilled 4 mm Ø, that on the inside 8 mm Ø.
Glue the plywood reinforcements in the wheel spats.
Allow the glue to set hard, then mount the wheel spats, wheels and wheel axles on the undercarriage
units as described below.
Fit the wheel axles in the wheel spats with the hexagon shoulder resting against the ply reinforcement.
Mark the length of the wheel axle with a felt-tip pen; it should project by about 1.5 mm on the outside
of the wheel spat.
Now slip the wheel and two collets (collet / wheel / collet) on the wheel axle, and fit this assembly in
the wheel spat, threading the axle through the holes. You will need to spread the spat slightly to allow
the axle to engage in the holes.
The wheel axles can now be screwed to the undercarriage legs. Apply a drop of thread-lock fluid to the
nuts to prevent them shaking loose.
9

Installing the petrol engine
These instructions only describe the method of installing the G 26 petrol engine, but the procedure is
the same for any other suitable power plant.
The first step is to screw the engine to the mount. Note that the distance between the rear face of the
motor mount and the front face of the propeller driver should be about 156 mm. Mark the position of
the screw-holes on the mount arms, then drill holes for the retaining screws.
Fix the engine to the mount arms using the retaining screws supplied.
Place the mount assembly on the nose bulkhead and position the centreline of the engine over the
centre of the marked lines.
In this position mark and drill the holes for the mount retaining screws on the engine bulkhead, using a
size of bit which fits snugly in the mount holes.
Alternatively the engine can be mounted on vibration absorbers, Order No. 6853.5; in this case the
holes in the nose bulkhead will need to be enlarged to accept the rubber dampers.
The throttle servo can either be installed in the fuselage or directly behind the engine on the nose
bulkhead (see photos).
The right-hand picture shows an M3 socket-head cap screw screwed into the throttle lever. This is
used to hold the choke flap closed, so that petrol is drawn through to the engine. The choke flap is
opened again by opening the throttle briefly from the transmitter.
Mount the exhaust manifold and silencer on the engine using the socket-head cap screws supplied.
The silencer is connected to the manifold using Teflon hose and spring clamps. Cut and file out the
holes in the cowl to clear the silencer, needle valve, etc.
The cowl is attached to the fuselage using pan-head self-tapping screws fitted above and below the
side cheeks.
Assembling and installing the fueltank
Your choice of fueltank varies according to the type of engine you have installed. If you have fitted a G
26 petrol engine, use the small tank supplied, with the appropriate (petrol-proof) fuel tubing. For a glow
motor the slightly larger tank shown below should be used.
Push a length of fuel tubing onto the fueltank clunk weight. Push the free end of the fuel tubing onto
one of the tubes in the fueltank stopper, and check that the clunk will be able to move freely inside the
tank without binding or jamming when the stopper is in place. Soften the other two tubes (filler and
vent) using a heat-gun or match, and bend them to the shape shown in the photo; one should point
down (later used for filling the tank), the other up (overflow line).
Now push the tank stopper over the neck of the fueltank and clamp it in place by tightening the crosshead
screw. It is important to tighten the screw to the point where the tank is completely sealed. You
can check this with a water test: hold the tank under water, seal two tubes and blow into the third: any
bubbles indicate a leak which must be corrected.
Push pieces of fuel tubing onto the tubes where they exit the fuel stopper.
Mark the fuel lines using a felt-tip pen to indicate which is the fuel feed, the overflow and the filler.
Fit the fueltank into the fuselage through the wing saddle, threading the three fuel tubes through the
hole in the nose bulkhead.
Glue a strip of wood across the fuselage sides behind the fueltank to ensure that it cannot shift
backwards in flight.
Connecting the fuel lines
Locate the 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. For the filler line we
recommend that you drill a 5 mm Ø hole in the right-hand side of the cowl. The filler tube is later
slipped through this hole and sealed with a sealing nipple, Order No. 140, before take-off.
Position of receiver, battery and switch
Install the receiver, receiver battery and switch in the fuselage in the positions shown in the photo.
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Assembling the TAXI 2400
Fit the wing panels together on the aluminium joiner tube.
To connect the aileron servos to the receiver we recommend using two 100 mm extension leads,
connected permanently to the appropriate receiver output sockets (2 and 5).
Connect the aileron servos to the extension leads attached to the receiver, then place the wing on the
wing saddle and fit the four metal screws to attach it to the fuselage.
Don’t over-tighten the screws; tighten them just to the point where the wing is held securely on the
fuselage and cannot move.
Fit the tailplane panels on the aluminium joiner tube and push them up against the fuselage so that the
retaining wedge engages fully in the yoke. Check that the retainer system holds the tailplane reliably
against the fuselage.
Balancing the TAXI 2400
With the fueltank empty, support the model under both wing roots at a point about 120 - 125 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. Check this before the first flight.
Control surface travels for normal flying
Ailerons 30 mm up, 28 mm down
Elevators 25 mm up, 25 mm down
Rudder 50 mm right, 50 mm left
Landing flaps and elevator trim for landing:
Flaps max. = 60°, 6 mm down-elevator
The stated travels should only be considered as a starting point; you may well find it necessary to
adjust them to suit your personal preference.
We recommend setting 35° exponential (expo) on all control systems at the transmitter.
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 elevators must both 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 motor should run to the full-throttle position, i.e. the
carburettor barrel should be fully open.
We recommend that you assign the landing flaps to a switch, and program the correct travel at the
transmitter.
Finally - we hope you have many hours of fun and pleasure flying your TAXI 2400.
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. 06/2005
Made in Vietnam
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