Calculating/changing headspeed?

[blsdmf]

I saw the video on headspeed in this forum but it was pretty short. I just need to make a couple things clear. To calculate headspeed, you have your gear ratio and the size of the battery? If this is the case then to change your headspeed your could change the battery you use or a different pinion gear? Do I have this right? Am I missing something? A larger pinion will give you more headspeed, but when is it necessary to change headspeed? When do you want more or less? I know thats a lot, but hanks for any input, I appreciate it.

[TheBum]

A higher head speed will give the heli more control authority and stability. However, it also increases the stress on the blades and that extra authority means that the heli is more sensitive to control inputs, possibly causing a less experienced pilot to more easily overcompensate. If you're running wood blades, a too-high head speed can cause them to break in mid-air.

The best way to adjust head speed is with a different pinion. However, while a larger pinion will give you higher head speed, it also requires the battery to be able to source more electrical current, so you need to make sure that the battery is up to the task, i.e. use quality packs and higher 'C' ratings.

[MarkD]

A smaller pinion will reduce the head speed. A larger one will increase it. The inverse for the main gear

Brushless motor are 3 phase motors and the higher the voltage the faster they will spin. But if the motor is only rated for a 3 cell lipo (11.1V) it will burn up on a 4 Cell (14.?) battery

[blsdmf]

Okay that clears things up, but I have read that people have a headspeed of 2400 rpm in normal and 2900 in idle up (just an example), how is that possible? Does that have something to do with the tx? Thanks guys

[TheBum]

In that case, yes, it's in the radio settings. It's a matter of adjusting the throttle curve for each flight mode.