9
Taurus 50
Main rotor shaft in the swashplate area,
Tail rotor shaft in the area of the tail rotor slider,
Main gearbox and freewheel.
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?
3) Is the main rotor shaft straight?
4) Is the distance between the flybar paddles and the main
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)?
5) Are the tail rotor blades installed correctly (note direction of
rotation)? Are the blades damaged?
6) Are the main rotor blades installed correctly (direction of
rotation)? Are the blades damaged? The main rotor blades
may need to be re-balanced - se page 14.
7) Is the blade tracking set accurately? See page 15 for the
checking procedure.
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 QUANTITY SUPPLIED
SFH0001 HEXAGON STARTER DRIVER 1
SFH0003 MAIN ROTOR SHAFT 1
SFH0004 COLLECTIVE PITCH COMPENSATOR HUB 1
SFH0005 ALUM. MAIN ROTOR CENTRE PIECE 1
SFH0006 SWASHPLATE HOLDER 1
SFH0007 SKID TUBE WITH PLUGS 2
SFH0009 CONTROL BRIDGE, ASSEMBLED 1
SFH0010 TAIL ROTOR CONTROL ARM 1
SFH0012 BALL-LINK WITH SWIVEL 2
SFH0013 CONTROL BRIDGE 1
SFH0014 CONTROL SLEEVE AND BUSH 1
SFH0015 FLYBAR 1
SFH0016 BLADE PIVOT SHAFT 1
SFH0017 DAMPER RUBBER 2
SFH0018 SPACER SLEEVE 2
SFH0019 RUBBER GROMMET 4
SFH0021 CABIN HOLDER 2+2
SFH0023 MAIN ROTOR HUB 1
SFH0024 CONTROL RING 1
SFH0027 SWASHPLATE ACTUATOR ARM 1
SFH0028 FUELTANK 1
