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D12 - RADIO - What
are each of the channels on the receiver used for on a helicopter ?
The answer to
this depends on what radio system you choose to use, but there are
really only two different system in use today.
Lets assume we
have a 6 channel receiver on our helicopter. The channels are
sometimes just numbered 1-6 which is not very helpful at all, while
other receivers will be marked with Throttle, Aileron, Elevator,
Gear, Gyro and Aux. Some receivers also have a Power/Bind connector,
but you can ignore it and starting numbering from 1 at the next
channel along from this connection because it is only used for
binding 2.4GHz radio systems. If your receiver has more than 6
channels, the extra channels are mostly known as Aux2, Aux3 ......
and are positioned after the standard AUX connection.
variations are basically the channel used for the throttle. This can
be Channel 1 or Channel 3 but thereafter the channels are still
setup in the same order, so the following are both valid
possibilities that you will come across :
Aileron, Elevator, Gear, Gyro and Aux.
Aileron, Elevator, Throttle, Gear, Gyro and Aux.
receiver uses only numbers, then without documentation you will need
to work out which channel is the throttle control channel. The
easiest way to do this is to connect the wire from your ESC (which
is the throttle) to Channel 1, and then the Aileron and Elevator
connections to Channels 2 and 3 respectively, and the left aileron
servo to channel 6. Disconnect the
motor for safety and then move the cyclic (right)
stick up and down and side to side and see if the swash plate
moves correctly for all movements. If it doesn't, then switch the
wiring over on channels 1,2 and 3 so that channel 1 is Aileron,
channel 2 is Elevator, and channel 3 is from the ESC (Throttle).
Repeat the test and the swash should then move correctly, assuming
the reverse switches are setup correctly.
You might be
wondering why the power from the ESC through the throttle channel
can be plugged into any channel on the receiver. The reason
for this is that the power wires (black and red or brown and green
usually) are connected all the way across ALL channels inside the
receiver, so you can plug the throttle connection into any channel
that mystify people the most are the Gear and gyro channels, and the
Aileron and Aux channels.
helicopters, we all have gyros fitted these days, and basically,
most gyros come with a connector wire that goes to the receiver that
has two different plugs. One is the control channel for the
tail servo, the other is the gain channel. Therefore, despite
the naming, the gyro control channel plugs into the GEAR connection,
and the gyro gain control plugs into the GYRO connection. Most
often, the gain channel is easy to recognise because it has only a
single wire, often yellow, or a different colour system to the
normal connections. Strange but true.
and Aux channels are rather more complicated, because the naming
conventions used were based on fixed wing aircraft, not helicopters,
which have different uses for these channels.
helicopter uses a single servo setup instead, then it is slightly
easier, because the Aileron channel control the single aileron
servo, and the Aux channel (often known as the Pitch control
channel) controls the single Pitch control servo, so pretty straight
forward really ?
your helicopter uses the 3 servo CCPM mixing system, then both of
these channels are used to control one each of the aileron servos on
the swash plate. So the question is, which aileron servo goes into
each of these receiver connections. Basically, there is no
hard and fast rule to this question. Typically the right hand servo
when viewed from the back of the helicopter is assumed to be the
Aileron channel servo, and the left hand side is therefore connected
to the Aux (Pitch) channel.
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