6
http://www.jperkinsdistribution.co.uk
http://www.jperkinsdistribution.co.uk
Twister Bell 47
7
http://www.jperkinsdistribution.co.uk
Twister Bell 47
straight for you a lot of the time but you will have
to use the yaw control to swing the nose of the
helicopter straight as you make progress across
the floor.
Keep practising and you will find that your flights
will become longer.
Please be aware that a model helicopter in the
hover–regardless of design–will never stay
completely still!
A helicopter will always require some level of input
to stop drift or a tendency to turn or climb. This is
not a sign of something faulty with the helicopter,
but is in the nature of a hovering helicopter.
By now you should be able to manage hops at a
height of between 10 and 30cm with duration of 5-10
seconds per hop. Flights will become longer and
easier as your co-ordination and understanding of
flight develop.
HOVERING AND MANOEUVRES
As your co-ordination and anticipation improves,
you should be able to reduce forward speed when
making 'hops', thereby bringing your helicopter into
a hover.
Practice hovering until you feel confident with the
basic handling of your helicopter.
Next, you should start experimenting at rotating
(yawing) the helicopter slightly to the left or right
using the tail rotor (yaw) controls–but only proceed
to this stage when you have mastered the hover!
From the hover, yaw the model a few degrees
left and then back to straight ahead–always
remembering to watch the nose. Practice yawing to
left and to right until you feel confident.
Next, practice crabbing your Twister Bell 47 to the
right and left using cyclic controls. Proceed as
follows:
From the hover, briefly 'nudge' a small amount of
right roll. Your Twister Bell 47 will start a drift to the
right. Put in a small amount of opposite roll to halt
the drift, then a small amount of left roll to start a
drift to the left. You will probably need to keep the
tail straight using tail rotor whilst doing this. Always
be ready to correct the drift by using opposite roll.
If you get into trouble at any stage, reduce the
throttle, land, change you trousers and try again.
BEYOND THE HOVER
As you become more proficient with your helicopter
you will want a larger space so you can really start
to fly around instead of hovering about all day.
If you do fly outside, please remember that any wind
will affect the performance of your Twister Bell
47. Please keep this in mind if you do fly outdoors
(in calm conditions) and don't be too surprised if,
while flying your model, it suddenly climbs or drops
without you making any input. This can be caused
by a breeze or even a 'thermal' coming through.
A training undercarriage can be a huge help by
providing your Twister Bell 47 with a wide track
and a degree of cushioning to aid stability and
therefore help prevent 'tip-overs'. See the parts
listing at the end of this manual. Another useful
training aid is a computer flight simulator which can
greatly enhance and speed up the learning process.
In addition a simulator is great for teaching you
“nose in”. This is when the nose of the helicopter
is pointing at you and where some of the controls
become effectively reversed–which can catch out
both experienced and novice pilots alike!
GOOD LUCK AND HAPPY FLYING!
TROUBLESHOOTING
VIBRATION
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
Flybar is bent.
Straighten or replace if badly bent.
Main blades out of balance.
Check that blades are not bent or broken.
MAIN ROTOR DOES NOT TURN
Check throttle stick and trim lever are in the
fully down position before advancing the
throttle stick.
Check all electrical connectors and that the
'4-in1' receiver crystal is seated securely in
the socket in the '4-in-1' unit.
Check Li-po battery is charged.
Check state of transmitter batteries.
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