J. Perkins Twister CP V2.1 Manual - page 11
http://www.jperkinsdistribution.co.uk
9
http://www.jperkinsdistribution.co.uk
TROUBLESHOOTING
VIBRATION
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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 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
sellotape or similar to the undersurface tip
area of the higher blade. Adjust until the
blades are level and re-attach rotor head.
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Solution 2 – Bent main shaft
The tail boom and undercarriage will vibrate
if the main shaft is bent. Replace the main
shaft and gear unit if you suspect a bent
main shaft
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Solution 3 – Main blades too tight. If the blade
retaining bolts have been done up too tight,
the helicopter will vibrate and/or 'nod'.
Loosen the blades and try again.
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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 main 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 arm
link pt. no 6601210 of the lower flying blade.
The idea is to increase the blade's angle
of attack which will make the blade to fly
higher. Be careful you do not damage any
parts. Test fly and check tracking again.
Adjust again if required until the blades run
'in track' as closely as possible.
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Solution 5 – Flybar paddles out of balance.
Check that the distances from the rotor
hub centre out to the flybar paddles are the
same for both paddles. Adjust the flybar
position by loosening the flybar retaining
collars associated with part no 6601190,
re-centring the flybar, then tightening the
retaining collar grub screws. N.B. A small
allen key will be required.
MAIN ROTOR DOES NOT TURN
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Solution 1 – Check throttle stick and trim lever
are in the fully down position.
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Solution 2 – Check all electrical connectors
and that the '4-in1' receiver crystal is seated
securely in the socket in the '4-in-1' unit.
MAIN ROTOR TURNS BUT
HELICOPTER DOES NOT TAKE OFF
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Solution 1 – This sometimes happens if your
rotor blades are flying at too low or too
shallow an angle. The helicopter will
sometimes take off but appears to have too
little power to climb. This is nearly always
because one main blade is flying too low. If
you can see which blade is flying low, follow
the same procedure as outlined in Solution
4. Alternatively, increase the flying angle of
both main blades as outlined in Solution 4.
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Solution 2 – Main motor needs to be loosened
because the main gear/motor pinion gear
mesh is too tight. The motor is retained by
2 screws. Slacken off both screws. Push
the motor away from the main gear and
retighten the screws in the new position.
LBW SYSTEM
Now included on the Twister CP V2.1 is this clever
device, this is designed to alert pilots when the
Li-Poly battery pack is running low and needs
recharging.
When this light flashes, land immediately and
recharge the Li-Poly battery pack as per the
instructions on page 2.
Failure to land immediately could result in the
battery pack being over discharged.