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ASSEMBLY INSTRUCTIONS 

Order No. 9352 

LEKI EXTRA 330SC 

RC aerobatic model for 2 LiPo cells 

This model requires a HoTT radio control system 

with at least four functions 

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY 

Modifications reserved! No liability for printing errors! 10/2011 

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It is essential to read and observe the safety notes in the appendix to these instructions. If you 

ever pass this model on to another person, be sure to include the complete assembly 

instructions. 

Introduction 

The LEKI EXTRA 330SC is a superbly manoeuvrable RC aerobatic model, and its 

compact dimensions make it easy to transport. The small dimensions should not 

mislead you into thinking that the assembly and operation of the model do not require 

any model aircraft experience. The model is very highly pre-fabricated. Nevertheless 

the construction stages described in these instructions must be carried out with great 

care to ensure that the model can be used safely and successfully. The all-up 

weight must not exceed 1000 g. 

RC system accessories (not included) 

You will need the items listed below in order to complete and operate the model. 

COMPUTER SYSTEM MX-16 GRAUPNER HoTT 2.4 GHz Order No.33116 

Transmitter charge lead Order No.3022 

Brushless motor COMPACT 345Z Order No.7738 

ELECTRIC PROP 10x5” Order No.1326.10x5 

GRP propeller spacer Order No. 197.60 

COMPACT CONTROL 45 Order No.7224 

LiPo 2/1600 7.4 V/1.6 Ah Order No.7634.2 

G 3.5 charge lead Order No.2970.L 

ULTRAMAT 16 S battery charger Order No.6468 

Servo DES 476 BB (5 required) Order No. 7915 

Servo extension lead 100 mm (2 required) Order No.3935.11 

Servo extension lead 180 mm (2 required) Order No.3935.18 

Hose binders 102 mm Order No. 1521.52 

Hose binders 188 mm Order No. 1005 

Hook-and-loop cable ties Order No. 1587 

Tools and adhesives required (not included) 

Balsa knife Order No.980 

Quick-drying glue Order No.5821 

Activator for quick-drying glue Order No.953.150 

UHU ALL PURPOSE ADHESIVE Power Order No.1096 

You will also need the following items: Philips screwdriver, open-end spanner SW 12, 

flat-nose pliers, wire cutter, drill Ø 1.6, Allen wrenches SW 1.5 and SW 2.5 mm, 

soldering gun and solder, hair dryer, sandpaper, geometric protractor, overhead 

marker, transparent tape, wood pulp paper, protective gloves, safety glasses. 

Assembly instructions 

Please read these building instructions completely before you start building, so that 

you have a clear idea of the sequence required. Before each stage, identify all the 

parts, tools and adhesives you will need, and have them ready. When working, 

always lay the parts on a clean, smooth surface, or a layer of foam material. Unless 

the instructions specifically state otherwise, use quick-drying glue with activator as 

adhesive. The best method is to apply glue to one face, then spray activator on the 



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opposite face. Make sure that no residual adhesive gets on your hands or on the 

surface of the model. Immediately wipe of excess adhesive with wood pulp paper. 

Caution: 

Cyano-acrylates must not come into contact with any part of your body or the 

eyes. For this reason, we recommend that you wear protective goggles when 

using this material. Store the adhesive out of the reach of children. For safety 

reasons, use only the adhesive mentioned above. Please observe the operating 

instructions and safety notices for the respective accessories 

The wing 

First apply adhesive (UHU ALL PURPOSE ADHESIVE Power) to the inserted aileron 

hinges and push up the aileron until there is a gap of about 1 mm. After waiting for it 

to dry, check whether the aileron is secure. 

Unscrew the servo cover from the wing and fit in the servo. Separate the excess 

levers and drill the outermost hole of the servo lever to Ø 1.6 mm. Put the servo into 

the neutral position, attach the servo level vertically, and screw it tight. Use cyanoacrylate 

to glue the servo to the respective attachment tab. 

Insert a string to pull the servo lead carefully into the wing. Screw on the servo cover 

and make the aileron connection. Connect the pushrods and glue in the horn of the 

aileron. Note: If you want to do extreme flight manoeuvres, you should use the longer 

servo levers that are also included with the servo. 



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The figure shows the assembled aileron linkage. Please note that the servo level 

length should be at least 12 mm to keep the clevis from colliding with the wing. 

The figure shows the servo lead exiting at the wing root. Later, use the CRP tube Ø 

8x280 mm to push the halves of the wing onto the fuselage. 

Fuselage and tail group 

First place the motor spindle, motor mount, and locking ring onto the motor; these 

parts are included as accessories in the package for Order No. 7738. 

The figure shows the individual parts for the motor spindle and motor mount; tighten 

all screws. 

The figure shows the motor with attached motor mount and motor spindle. Separate 

the motor leads and remove about 5 mm of insulation. Apply solder to the ends of all 

leads and then solder on the G 3.5 connectors (included with Order No.7738). 

Insulate the connector shaft with the heat-shrink sleeves (included with Order 

No.7738) . Use a hair dryer to shrink the heat-shrink sleeve. Then do a test run of 



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the motor. Viewed in flight direction, the motor should rotate to the right; if this is not 

the case, switch any two of the leads and re-insert. 

Using the 4 M 3x10 mm and the washers and locking rings shown, screw the motor 

in tight. 

Place the GRP propeller spacer onto the propeller, enlarge the cut-outs in the spinner 

cap to fit the propeller, separate the two short pins on the spinner back plate, so that 

the spinner cap fits and can be pushed on without any stress. 



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Now adjust the motor with the moveable motor bulkhead so that spinner and motor 

bonnet match up. When everything fits, attach the motor bonnet with tape. Keep 1 

mm of play between the spinner back plate and fuselage. 

The motor bonnet, which is still held in place by tape, is now screwed into place with 

four Ø 2.2x6 mm metal screws as shown in the illustration. Pre-drill at Ø 1.6 mm. 

Glue the motor bulkhead in place through the cooling air intakes. 

Remove the motor bonnet again, glue in the 8x8 mm chamfer strips and completely 

glue in the motor bulkhead from the front as well. 



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Use UHU ALL PURPOSE ADHESIVE Power to glue in the rudder hinges of the 

tailplane and vertical stabilisers in accordance with the method already described. 

Use a geometric protractor and overhead marker to exactly mark the midline of the 

tailplane; then area to be glued to the fuselage. Use the hot tip of a soldering gun to 

cut through the covering sheet, and pull it off. 

Slide the tailplane into the fuselage exactly centred and glue it from the inside as 

shown. For the lowest rudder hinge of the rudder cut a slit in the fuselage; then push 

on the vertical stabiliser as well. First try this procedure without any adhesive. Above 

all, make sure you do not use activator for the gluing process. 



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The rudder is controlled by control leads on two sides. The figure shows the double 

rudder horn and the clevis with threaded bushing on the servo side. Insert the control 

leads into the fuselage and secure them as shown with the pressed-together 

bushing. 

The figure shows the central rudder servo with the inserted control leads, which are 

adjusted and tightened using the threaded bushings. For this purpose, glue in the 

rudder horn and drill a Ø 1.6 mm hole in the servo lever arm. Place rubber grommets 

on the servo, insert the hollow rivets from below, and screw in the servo. All servo 

attachment elements are included with the respective servos. 

The two-part elevator is controlled by two separate servos. The figure shows the left 

elevator servo. Make sure that the two rudder horns are glued in exactly the same. 

Note: If you do not wish to fly any extreme flight manoeuvres, you should reduce the 

rudder deflection in accordance with the transmitter setting. 



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The figure shows the right elevator servo the control already attached. 

Undercarriage and cockpit canopy 

The figure shows the undercarriage struts, the wheel covers, and the elements for 

attaching the wheel and wheel cover to the undercarriage struts. 

First trim the transitional cowling to the fuselage and slide it onto the undercarriage 

struts; check the fit to the fuselage. 

The figure shows the individual parts of the wheel axle and left wheel cover with the 

3x9 mm elongated hole. Glue the two plywood spacers flush with the axle, slide on 

the wheels, screw on the M 3 nut, and insert into the wheel cover. 



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The figure shows the completed wheel with cover, which is now firmly connected to 

the undercarriage strut by means of washer and M 3 nut. Align the two wheel covers 

exactly. When everything fits, secure the connections with adhesive. Caution: Do not 

get any adhesive on the wheel hub. 

The figure shows the completely assembled and attached undercarriage, which is 

screwed on with three M 3 screws, including locking rings. Do not remove the 

covering sheet to do this; just puncture it for the screws. 

Put the fuselage fairing in place, glue in the pilot, and glue on the cockpit canopy with 

UHU ALL PURPOSE ADHESIVE Power, hold in place with tape. 

Note: If you value particularly agile flight characteristics, you can do without the bust 

of the pilot in order to save about 30 g in all-up weight. 



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Decals 

Cut out the individual decals and name placards and apply them to the model as 

shown in the illustrations on the kit box lid or in the following two-page view. 

Two-page view 

The original LEKI EXTRA 330SC at Hahnweide 2009. 



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Installing the receiver and LiPo battery 

The first step is to connect the servo leads to the receiver; we recommend the 

following sequence: speed controller to socket 1, left aileron servo to socket 2 

(extension cable 100 mm), left elevator servo to socket 3 (extension cable 180 mm), 

rudder servo to socket 4, right aileron servo to socket 5 (extension cable 100 mm), 

right elevator servo to socket 6 (extension cable 180 mm). Now use the radio 

controller to test all the functions. Caution: After closing the G3.5 connector, the 

motor can start; do not touch the propeller! 

The figure shows the speed controller and GR-12 HoTT receiver held in place by 

hose binders; the LiPo battery is held in place by hook-and-loop cable ties. The photo 

also how each wing half is secured by an M 3 screw. 

Rudder deflections 

The following rudder deflections are recommended, but can be changed as desired. 

Ailerons 25 mm in each direction, elevators 25 mm in each direction, rudder 50 mm; 

all measured at the inboard or bottom edge of the rudder. 

Balancing 

Check the balance with the model in ready to fly condition, meaning with the LiPo 

connected. The centre of gravity is 72 mm from the leading edge of the wing. Adjust it 

by moving the LiPo battery as needed. Check the centre of gravity by simply 

supporting the model under the wing on two fingers. The model should balance level 

at the point indicated. 

Flying 

Fly the model for the first time with rudders in the neutral position on a day with little 

or no breeze. A smooth runway into the wind is ideal for a ground start. If no runway 

is available, start the model by means of a hand start into the wind. Use minimal 

aileron and elevator corrections to keep the model in a straight climb. The fine trim is 

done via the trim slider below or next to the joysticks. Always land the model flying 

directly into wind, with the motor idling but not switched off. Just before touch-down 

reduce air speed through careful use of up-elevator. Always land the model flying into 



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the wind. 

Here at GRAUPNER Modellbau, we hope you have many enjoyable flights with your 

new model, the 

LEKI EXTRA 330SC 



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Safety notes 

Valid third-party insurance must be obtained before you operate any model aircraft; this is now 

a legal requirement. 

Before you attempt to assemble and fly the model, it is essential to carefully read all the 

assembly and operating instructions. You alone are responsible for the safe operation of your 

RC model aircraft. Young persons should only be permitted to build and operate this model 

under the instruction and supervision of an adult who is aware of the hazards involved in this 

activity. 

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 and 

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. In addition, you must also observe postal regulations for the remote 

control system. You will find more information on this subject in the operating instructions 

supplied with your radio control system. 

Be sure to use only those parts included in the kit, together with other genuine Graupner 

accessories and replacement parts as recommended expressly by us. Even if you change a 

single component you can no longer be sure that the system will work reliably, and such 

changes also invalidate your guarantee. 

Take care to avoid short-circuits and reversed polarity. 

The high energy density of LiPo batteries involves a risk of fire and even explosion. 

A radio-controlled model aircraft can only work properly and fulfil your expectations if it is built 

very carefully and in accordance with the assembly instructions. To avoid injuring people and 

damaging property, it is essential to be careful and painstaking at all stages of operating your 

model. Nobody would climb into a full-size glider and attempt to fly it without undergoing 

suitable training beforehand. Successful model flying is also only possible with suitable 

training and plenty of practice. 

As manufacturers, however, we are not in a position to influence the way you build and operate 

your RC model aircraft. All we can do is expressly point out the hazards involved in this 

activity, and for this reason we reject any liability. 

We suggest that you ask an experienced model flyer for help, or join a model club or model 

flight training school. Your local model shop and the specialist magazines are excellent 

sources of information. It is always best to join a club and fly at the approved model flying site. 

Adhesives contain materials which may be hazardous to health under certain circumstances. 

Read and observe the notes and warnings supplied by the manufacturer of these materials. 

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. 

If there are passers-by or spectators at your flying site, make sure that they are aware of the 

dangers inherent in your activity before you start the motor, and insist that they keep a safe 

distance away. 

Always keep a safe distance from people and objects when flying; never fly low over people’s 

heads, and never fly directly toward them! 

Models should only be flown in a temperature range of -5° to +35 ° C. Extreme temperatures can 

lead to changes in battery capacity and material characteristics, weakened glued joints, and 

other unwanted effects. 



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All model fliers should take care to ensure that the public safety, especially that of people and 

property, as well as orderly flying operations, are not endangered or disturbed. 

Never operate your model aircraft close to high-tension overhead cables, industrial sites, 

residential areas, public roads, squares, school playgrounds, public parks or sports grounds et 

cetera. 

Pre-flight check 

Check all the model’s working systems before every flight: switch on the transmitter followed 

by the receiving system. Extend or the transmitter aerial, then check that all the model’s 

control surfaces are at neutral (centre), work properly, and deflect in the proper direction. 

Repeat the check with the motor running, while someone holds the model securely for you. 

If you are a relative beginner to model flying, we strongly recommend that you ask an 

experienced helper to support and help you during the first few flights. 

Don’t ignore our warnings. They refer to materials and situations which, if ignored, can result 

in fatal injury or permanent damage. 

Propellers and other rotating parts that are powered by a motor constitute a constant hazard 

and represent a real risk of injury. Do not touch them with any part of your body. For example, 

a propeller spinning at high speed can easily cut your 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. This can easily 

result in serious personal injury. Ensure that no other object can come into contact with the 

revolving propeller. 

Make sure that no object is blocking the propeller. 

Every time you intend to operate your model, check carefully that it and everything attached to 

it (e.g. propeller, gearbox, RC components, et cetera) are in good condition and undamaged. If 

you find a fault, do not fly the model until you have corrected it. 

Before you switch the radio system on, always make sure that your frequency is vacant. 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 unattended, as another person might pick it up and try to use it. 

Do not switch on the electric motor unless you are sure that there is nothing in the rotational 

plane of the propeller. Electric motors with the propeller attached should only be run when 

firmly mounted. 

You should always be aware of the model’s position and attitude throughout each flight, so 

that you can execute control and avoidance manoeuvres. If you detect a control problem or 

interference during a flight, immediately land the model for the sake of safety. Models must 

always give way to full-size aircraft. Take-off and landing strips should be free of people and 

other obstacles. 

To ensure proper operation of your RC system, make sure that the batteries are kept fully 

charged. 

Never use batteries which are hot, faulty or damaged. At all times heed the instructions 

provided by the battery manufacturer. 

Before each flight check that all functions on the model aircraft are working correctly, and that 

the radio control system is in good order and operating at full range. 

Note that the motor control (throttle) function on the transmitter must always be moved to the 

OFF position as the first stage in preparing for a flight. To keep the electric motor from starting 

unexpectedly, always switch the transmitter on first, and only then the receiving system. Also, 

always switch the receiving system off first and only then the transmitter. 



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Check that the control surfaces follow the movement of the transmitter joysticks. 

After each session, remove the battery from the model, discharge it to the recommended level, 

and store it in a safe place, well out of the reach of children, at a temperature in the range 

about +5°C to +25°C. 

These notes are intended only to make you aware of the many dangers and hazards that can 

arise if you work carelessly or irresponsibly. If you take reasonable care, model flying is a 

highly creative, instructive, enjoyable and relaxing pastime. 

Manufacturer’s declaration: 

If material defects or manufacturing faults should arise in a product distributed by us in the 

Federal Republic of Germany and purchased by a consumer (§ 13 BGB), we, Graupner GmbH & 

Co. KG, D-73230 Kirchheim/Teck, Germany, acknowledge the obligation to correct those 

defects within the limitations described below. 

The consumer is not entitled to exploit this manufacturer’s declaration if the failure in the 

usability of the product is due to natural wear, use under competition conditions, incompetent 

or improper use (including incorrect installation), or external influences. 

This manufacturer’s declaration does not affect the consumer’s legal or contractual rights 

regarding defects arising from the purchase contract between the consumer and the vendor 

(dealer). 

Extent of the guarantee 

If a claim is made under guarantee, we undertake at our discretion to repair or replace the 

defective goods. We will not consider further claims, especially for reimbursement of costs 

relating to the defect (e.g. installation / removal costs) and compensation for consequent 

damages unless they are allowed by statute. This does not affect claims based on legal 

regulations, especially according to product liability law. 

Guarantee requirements 

The purchaser is required to make the guarantee claim in writing, and must enclose original 

proof of purchase (e.g. invoice, receipt, delivery note) and this guarantee card. He must send 

the defective goods to us at his own cost, using the address stated above. 

The purchaser should state the material defect or manufacturing fault or the symptoms of the 

fault in as accurate a manner as possible so that we can check whether our guarantee 

obligation is applicable. 

The goods are transported from the consumer to us and from us to the consumer at the risk of 

the consumer. 

Duration of validity 

This declaration only applies to claims made to us during the claim period as stated in this 

declaration. The claim period is 24 months from the date of purchase of the product by the 

consumer from a dealer in the Federal Republic of Germany (date of purchase). If a defect 

arises after the end of the claim period, or if the evidence or documents required according to 

this declaration in order to make the claim valid are not presented until after this period, then 

the consumer forfeits any rights or claims from this declaration. 

Limitation by lapse of time 

If we do not acknowledge the validity of a claim based on this declaration within the claim 

period, all claims based on this declaration are barred by the statute of limitations after six 

months from the time of claim, but not before the end of the claim period. 

Applicable law 

This declaration, and the claims, rights and obligations arising from it, are based exclusively 

on the applicable German Law, without the norms of international private law, and excluding 

UN retail law. 



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