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D9 - RADIO - What is the
Throttle Hold Switch for ?
The Throttle
hold switch is, to my mind at least, one of the most important
switches that every radio should provide. As it's name
implies, it stops the throttle from being changed, or more precisely
in most circumstances, it forces the throttle setting to be FULLY
OFF. ensuring that the motor cannot spool up accidently.
When training
my student to hover, I always call it the SAFETY SWITCH, rather than
Throttle hold, as it improves the importance of this switch.
If you turn
most radios on with this switch on, they will flash a warning and
refuse to initialise. Strange really as logically it should
insist this switch is ON when the radio is powered on, but there it
is. So as soon as the radio has initialised, I make it
mandatory for anyone to put the THROTTLE HOLD/SAFETY switch ON
IMMEDIATELY. (I am assuming here that it has been setup in the
radio to be at least 0%, and preferable -5% or so to be really sure
the motor cannot start)
This means
that once you arm the helicopter, the motor cannot start up, even if
you drop the radio or knock it over. The only time you EVER
TURN IT OFF is when you are literally ready to take off.
Equally,
as soon as the helicopter is back on the ground, always turn the
SAFETY back ON before anyone approaches it.
The other
reason it exists is for performing/practising auto rotations.
These are to allow you to learn to land the helicopter safely even
though the motor has stopped. I will not describe how to do
auto rotations here, but is is quite obvious that if you kill the
motor in flight using the THROTTLE HOLD/SAFETY switch, you have to
land it really quickly.
HOPE
THIS DESCRIPTION HELPS ... ?
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