5
http://www.modelengines.com.au
TWISTER
troubleShooting
Vibration
Solution 1 – Out of balance main blades
If vibration of tail boom or undercarriage is
noticeable, the most likely problem will be
out of balance main blades. To cure this,
balance the main blades as follows: Remove
the complete rotor head from the main shaft.
Support the head assembly by placing the
flybar paddles on 2 glass tumblers or similar.
Observe which blade falls lowest and add
some tape to the underside tip of the higher
blade. Adjust until the blades are level and
re-fit the rotor head assembly.
Solution 2 – Bent main shaft
The tail boom and undercarriage will vibrate
if the main shaft is bent. Replace the main
shaft and gear if you suspect that the main
shaft is bent.
Solution 3 – Main blades too tight.
The helicopter can also vibrate if the main
blade retaining bolts are too tight. Loosen
the bolts slightly and re-try.
Solution 4 – Blade tracking is out.
Sometimes, the rotor blades will fly at
different heights and this will cause
vibration. When the helicopter rotor disc is
viewed in flight, the red tipped blade may fly
at a different height to the other main blade.
The blades are running ‘out of track’. Note
which blade is lower. Land the helicopter
and lengthen the pitch control link (#6601210)
of the lower flying blade. This increases the
blades angle of attack which will make the
blade fly higher. Test fly and check the blade
tracking once again. Re-adjust if necessary
to get the blades to run ’in track’ as close as
possible.
Solution 5 – Flybar paddles out of balance.
Check that the distances from the centre
hub out to the flybar paddles are the same
for both paddles. Adjust the flybar position
by loosening the flybar retaining collars
associated with part #6601190 and sliding
the flybar through the centre hub. Re-tighten
the retaining collars.
main rotor DoeS not turn
Solution 1 – Check throttle stick and trim lever
are both fully down when turning on the
helicopter.
Solution 2 – Check all electrical connections.
Check that all electrical connectors are
seated properly.
Solution 3 – Check that the orange light on the
receiver is glowing solid to show that the
transmitter and receiver are bound.
Solution 4 – Check that the motor pinion gear is
engaged with the main drive gear.
Solution 5 – Check that the LiPo battery is
charged.
Solution 6 – Check the state of the transmitter
batteries. Replace if neccessary.
main rotor turnS but
helicopter DoeS not take off
Solution 1 – This sometimes happens if your
rotor blades are flying too low (not enough
pitch). The helicopter will sometimes take
off, but appears to be low on power. This
is nearly always because one blade is
flying too low. If this is the case, follow
the procedure outlined in Solution 4 of
VIBRATION.
Solution 2 – Gear mesh too tight.
This is rectified by loosening off the motor
retaining screws and pushing the motor
away from the main gear slightly. Re-tighten
the mounting screws to secure the motor
in its new position. There should be a small
amount of backlash present between the
pinion gear and main gear.
