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Locating and eliminating faults
The motor fails to start
The motor starter shaft does not turn:
The motor may be flooded (too much fuel in the cylinder).
Unscrew the glowplug, then spin the motor with the starter to
force the excess fuel out of the cylinder head.
The motor turns over when the starter is operated, but
fails to fire:
1) Is the glowplug glowing? Unscrew the glowplug and
connect it directly to the glow clip. The filament in the
glowplug should now glow bright red. If not, either the glow
battery is flat, or the glowplug is burned out (e.g. broken or
burned-out coil)
2) Is the needle valve correctly set? Read the notes on correct
needle settings in the operating instructions supplied with
your motor.
3) Does the carburettor throttle arm move smoothly and in the
correct „sense" when the transmitter stick is operated?
The motor fires, but stops again immediately:
1) Open the carburettor barrel slightly from the transmitter.
Note that the throttle barrel should never be more than 1/3
open when you are starting the motor!
2) Try a different glowplug. There are different ratings for
glowplugs to suit different fuels and operating conditions.
Ask an experienced pilot and experiment with different
glowplugs until you have established the best one for your
motor.
The motor runs, but the helicopter fails to lift off:
1) Check the main rotor collective pitch values. When the
collective pitch stick on your transmitter is at centre, the
pitch angle of both main rotor blades should be around +5º.
2) Does the carburettor throttle lever move correctly? When
the collective pitch stick on the transmitter is at maximum
(climb), the carburettor should be fully open. When the stick
is at minimum (descend) and the throttle trim moved back
fully, the carburettor should be completely closed. For more
information on these settings and requirements please
study the instructions supplied with your radio control
system. Methods of working may vary slightly from make to
make.
3) The needle valve may not be correctly set. Start by
screwing in the needle valve (clockwise) until it stops, then
open (unscrew) it again by around 1 1/2 turns (anti-
clockwise). Note: this value assumes the use of a motor
with silencer pressure. Now start the motor again. If the
model still does not lift off, the motor is probably set too
rich. The evidence of this is a dense plume of smoke from
the exhaust, and the motor tends to cut when you increase
collective pitch (climb). In this case close the needle valve
by 1/8 turn (clockwise) to lean out the mixture. Don't make
the mixture too lean (clockwise), as this will cause the
motor to overheat and possibly suffer terminal damage.
Helicopter problems
The helicopter shakes and vibrates
1) Is the main rotor blade pivot shaft straight?
2) Is the flybar straight?
Ornith 46
3) Is the main rotor shaft straight?
4) Is the distance between the flybar paddles and the main
5) Are the tail rotor blades installed correctly (note direction of
6) Are the main rotor blades installed correctly (direction of
7) Is the blade tracking set accurately? See page 15 for the
Note on replacing parts
Whenever you have to replace any parts which involve metal-
to-metal joints, use thread-lock fluid (Loctite, No. 5074) to
secure the joints.
And one final tip
On no account attempt to fly your new model helicopter without
enlisting the help of a good, experienced helicopter pilot. Many
apparently difficult problems sort themselves out virtually by
themselves if you can fall back on the experience of a
competent helicopter pilot.
robbe Modellsport GmbH & Co. KG
We reserve the right to alter technical specifications
REPLACEMENT PARTS LIST - ORNITH 46
ORDER NO. DESCRIPTION
SFH0001
SFH0002
SFH0003
SFH0004
SFH0005
SFH0006
SFH0007
SFH0008
SFH0009
SFH0010
SFH0011
SFH0012
SFH0013
SFH0014
SFH0015
SFH0016
SFH0017
SFH0018
9
rotor shaft identical on both sides? Are they set plano-
parallel to each other? Are they running in the correct
direction (relative to the direction of rotation of the main
rotor)?
rotation)? Are the blades damaged?
rotation)? Are the blades damaged? The main rotor blades
may need to be re-balanced - se page 14.
checking procedure.
HEXAGON STARTER DRIVER
FRONT BELT PULLEY
MAIN ROTOR SHAFT
COLLECTIVE PITCH COMPENSATOR HUB 1
ALUM. MAIN ROTOR CENTRE PIECE
SWASHPLATE HOLDER
SKID TUBE WITH PLUGS
TOOTHED BELT
CONTROL BRIDGE, ASSEMBLED
TAIL ROTOR CONTROL ARM
REAR BELT PULLEY
BALL-LINK WITH SWIVEL
CONTROL BRIDGE
CONTROL SLEEVE AND BUSH
FLYBAR
BLADE PIVOT SHAFT
DAMPER RUBBER
SPACER SLEEVE
QUANTITY SUPPLIED
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