What does the pitch/throttle stick trim do?

[PeteStewardson]

Just noticed when I was checking the settings on my TX so I can work out which bits to alter. In my first normal mode setting the throttle/pitch stick trim was lowered by Dave when he was flying it. But he didn't add any to the other 2 modes.

So I just wondered what it does?

In a Nitro set-up I'm assuming it's idle speed trim? But what about in an electric model?

[tiddler]

The trim should be centred and you shouldn't need to alter it at all unless your binding your tx to a coaxial. In which case it should be set to low.

[PeteStewardson]

Interesting, I wonder why he'd changed it then.