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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...

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