GRAUPNER LEKI EXTRA 330SC User manual

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 1 -
Order No. 9352
ASSEMBLY INSTRUCTIONS
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
- 2 -
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

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 3 -
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 cyano-
acrylate 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.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 4 -
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

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 5 -
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.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 6 -
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.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 7 -
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.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 8 -
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.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 9 -
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.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved! No liability for printing errors! 10/2011
- 10 -
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.