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D12 - RADIO - What
is meant by hover pitch and hover throttle trims on a radio ?
The answer to
this depends on what radio system you choose to use, and even
whether or not these trims are provided on your particular radio,
but they are really quite useful if your radio does have them.
Basically, the
radio will have two proportional switches somewhere reasonably
accessible marked Hover Throttle and Hover Pitch, and what these do
are to vary the value of these two channels, but only around the
hover position, which is a bit over 50 % throttle setting.
Lets assume
that your throttle curve is set to say, 0%, 25%, 50%, 75%, 100% (a
straight line "curve"). By pushing the Hover throttle
control lever upwards, this would increase the 50% setting to maybe
as far as 60%, and by pulling it backwards would reduce it to 40%.
The result of this would be to increase and decrease the head speed
quite noticeably, but only around the hover position. none of the
other values would change at all.
Much the same
applies to the Hover Pitch control, except it varies the amount of
pitch on the main blades around the hover position. So if you
increase the pitch value using this control, the helicopter will try
to climb, and also the head speed may drop a bit as well. The
reverse is true if you decrease the pitch.
So why would
we want these, as we can use the Throttle and pitch curves
themselves to alter this middle value. Very true, but it is often
very useful to be able to do this while the helicopter is actually
hovering, maybe to increase the head speed on a gusty day. It also
lets you experiment with this middle position a lot quicker, and may
even make you decide to change the main curves rather than using the
trims all the time.
In other words
it is a nice feature to have on a decent radio, but not actually
essential...
HOPE
THIS HELPS ... ?
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