ChopperAddict's Hints & Tips

CHOPPERADDICT SPECIALISES IN THE BUILDING, REPAIRING & 
SETTING UP OF R/C HELICOPTERS AND RADIOS

   

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  How To  - Ensure the throttle is set correctly with a DX6i

This page is a follow up to some diagnostic work I have been doing recently with two different pilots who understand the DX6i transmitter settings, but still ended up with the throttle working the WRONG WAY AROUND

Naturally this caused both to have the head spool up on them unexpectedly, luckily without any serious injury, but due to this I believe it is worth publishing the facts and eventual fix for this particular problem here on the ChopperAddict Tips & Tricks pages.

NB - This issue does not effect the stock Esky ESC, but it does and can effect every other ESC that provides a means of letting it sense the low and high throttle settings, which includes most decent ESC's

Both pilots went through the standard setup in the DX6i for a helicopter, and everything APPEARED to be working just fine. Both had the motor disconnected during all the basic setup for additional security, as of course they should.

When it was time to set the throttle, they reconnected the motors, followed the instructions for the ESC's they were using, turned on the radios with the throttle stick AT FULL THROTTLE, and finally connected the LIPO in the helicopters.

Despite the claimed safety features that are supposed to avoid any such accidental spooling up, both helicopters failed to initialize correctly, so quite reasonably, the pilots pulled the throttle down to ZERO.  

THAT WAS WHEN THEY SPOOLED STRAIGHT UP TO FULL THROTTLE

Clearly, the first thought was that the throttle settings in the DX6i were incorrectly set up backwards, but despite all reasonable attempts both helicopters continued to exhibit the same problem, with the throttle apparently being totally reversed.

After a great deal of testing and comparing and messing around with the DX6i, the problem turned out to be due to the ENDPOINTS not being set correctly, resulting in the ESC believing that the throttle was NOT FULLY DOWN, and it therefore did not initialize fully.

The problem is actually quite easily overcome, and all you need to do is to go into the ADJUST menu, select the TRAVEL ADJUST menu, then the THROTTLE VALUE, and ENSURE THAT YOU HAVE THE LOWER LIMIT (with the stick fully down) set to as high a value as possible.  The indicator on the left shows the direction it is setting the the throttle for, which in this case will be DOWNWARDS, and for safety, at least initially, I recommend that you set both end values to 125%.

Don't forget that when you select a value in the DX6i to be changed by placing the cursor into the relevant field, it will show two different values, depending on the stick position, so you need to set it with the stick fully down, and then again while holding the throttle stick fully up.

This will ensure that both the low and high throttle points are sensed correctly, and the ESC is then also able to sense the full throttle value.

I SURE HOPE THIS SAVES OTHERS FROM BEING CAUGHT OUT BY THIS POTENTIALLY DANGEROUS PROBLEM

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