J. Perkins Twister CP V2.1 Manual - How Does A Helicopter fly?
http://www.jperkinsdistribution.co.uk
5
http://www.jperkinsdistribution.co.uk
ADVANCED FLYING FEATURES
Flybar weights
Your Twister CP V2.1 is equipped with adjustable
flybar weights which are designed to increase
stability as they are moved further out along the
flybar. Moving the weights inboard will make the
helicopter more responsive to cyclic commands.
After adjustment, flybar balance must be checked
by releasing all linkages to the flybar and observing
which way the flybar seesaw unit falls. Adjust until
balanced.
3D/idle up switch
The Twister CP V2.1 transmitter features an idle up
switch. This is for use when flying outdoors and for
performing aerobatic manoeuvres.
When the switch is pulled forward, a new 'throttle
curve' and 'pitch curve' are applied.
With idle up on, collective pitch travel is increased
at low stick, whilst at the same time, power is never
allowed to fall below 60% over the lower half of
throttle stick travel.
The nett effect is to provide high power at low
throttle stick positions thus providing a constant
rotor speed during aerobatic and descending flight
patterns.
WARNING!
Do not operate this switch unless you are an
experienced pilot!
If you are new to RC helicopters we recommend
you read the following sections:
How does a helicopter fly?
Flight training tips
NEVER FLOWN R/C
HELICOPTERS?
WE RECOMMEND YOU
SEEK ADVICE FROM
YOUR LOCAL MODEL
SHOP
HOW DOES A HELICOPTER FLY?
Both model and full-size helicopters are controlled
in similar ways. A helicopter must be controlled
about 4 axes simultaneously; yaw, pitch, roll and
height. Your transmitter has 2 dual-axis precision
stick units designed specifically for this task. The
transmitter is supplied in Mode II version where
the left stick controls height (climb or descent) and
tail rotor controls yaw (left or right). The right stick
operates the cyclic steering controls which are
used to pitch the helicopter nose up/nose down and
to roll the helicopter left or right.
Note that the included DVD depicts the use of a
Mode I (throttle right) transmitter.
Transmitter stick movements
Helicopters require relatively small control inputs of
relatively small duration. Do not move the sticks to
extreme positions. A delicate touch is required on
the sticks. The sticks should be allowed to return to
neutral almost immediately after a control input is
made. If you watch an experienced pilot hovering
his helicopter, you will see that his transmitter sticks
hardly move. This is the goal you will be working
towards in this guide.
Height control
A helicopters rotating wings - the rotor blades,
generate lift, in the same way that a propeller
generates thrust. The lift generated by the main
rotor blades increases as rotor speed rises causing
the helicopter to climb. Conversely as the main rotor
speed is reduced, the helicopter descends.
This method of helicopter height control is called
'fixed pitch'.
Height is managed using the throttle stick of your
transmitter.
Push forward to climb, pull back to descend.
Tail control
Motor-driven rotor blades generate an opposing
force (torque) that acts on the body of the
helicopter, twisting the fuselage in the opposite
direction of rotation to the main rotor blades. This
rotation needs to be balanced by thrust generated
by the tail rotor.
When a helicopter is in the hover and the torque
generated by the main rotor has been balanced
by the tail rotor, a helicopter can be yawed left or
right. If the tail rotor speed is increased, more tail
thrust is generated and the nose of the helicopter
yaws (swings) to the right. If the tail rotor speed
is decreased the nose of the helicopter will swing
to the left. This is called 'tail rotor control' and is
achieved by operating the rudder stick of your
transmitter.
Push the rudder stick left to yaw the nose of the
helicopter to the left and push to the right to yaw the
nose right.
Your Twister CP V2.1 helicopter is fitted with a micro
piezo gyro and electronic mixing system which