ChopperAddict's Hints & Tips


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   INFORMATION - Basic Throttle & Pitch curves for DX6i etc

  My grateful thanks go to dyls1 in the Heliguy Forums 
for allowing me to use his diagrams and for the inclusion of some descriptive text.

For some strange reason there is quite a bit of misunderstanding about both throttle and pitch curves when using a programmable computer radio system such as the Spektrum DX6i or similar.  I suspect this is because the documentation that comes with these radios does not provide any real guidance in these areas (or others for that matter)

Hopefully this brief article will help to clarify what the curves are, and what settings are a good starting point...


A properly setup head will give you a pitch range of about -9 to +9 degrees so every for every change of 1/18th should equal a degree of pitch. 

In the examples below there is a pitch range of just under -2% to +9 in normal mode. It gives a nice gentle decent but you may need to increase the negative pitch slightly (33 at zero stick would be -3% pitch) if it's a little windy as it can be hard to land without going into idle up. 


The above image shows the NORMAL pitch range starts at around 40%, which is around -2 or -3 degrees pitch.  The STUNT (IDLE UP) starts at 0%, which is full negative pitch of -9 degrees


The STUNT/IDLE UP throttle curves may be a little less obvious, but the NORMAL curve is just that. The diagram below shows a classic curve for the throttle in that it climbs rapidly to 60% initially, and before you even reach half throttle stick, so that we can get the rotor head speed up quickly, and then increases a lot more slowly for the rest of the throttle travel.

The STUNT/IDLE UP curve is again a classic.  At 0% throttle stick we actually have FULL THROTTLE, which will be used when we are inverted.  At the 50% throttle stick we have 80% throttle, and again at full throttle, we return to 100% throttle, for normal flight.  You should also note that the NORMAL and STUNT throttle settings CROSS at 80% throttle, so that is the throttle position you need before switching between NORMAL and STUNT modes.

You can certainly vary these to suit yourself, but the curves shown above are a perfect starting point for configuring a DX6i or similar radio.


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