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Friday, December 9, 2011

Throttle Mix For Better Performance

Awhile back, Andrew Jesky told me his trick for getting better throttle response out of an electric motor is to bump up the throttle trim until the motor starts idling. I tried this and it works great, but messing around with the trim was too much trouble considering that you can mix in just about anything with the fabulous new computer radios.

So, I tried a mix and put it on a switch. That way the idle is on/off. This is much quicker in the event of a crash or nose over than working the trim until you hit center. Just turn it off.

Some people have been having trouble with the latest ESCs studdering on start up. The newest versions can sometimes be a little fussy to get going from a complete stop, but again, run an idle and it all goes away.


 
While this is not all that uncommon, running an idle stops this problem cold. Where some guys are having a bit of trouble is from absolute dead stopped. The motors kick back and forth and don't really want to get going, but if you run an an idle, they will start up as soon as you flip the switch.

Now, this studdering on start up is completely different from out of sync timing, which causes the motor to squeel and stop completely. Start up studdering is only from dead stop and I've never seen it cause a problem in the air, because the motor never completely stops in the air unless you has the ESC set with the brake on.

I fly Futaba, so I run a channel three to channel three (throttle to throttle) mix. I flip it on, and then dial in the amount of idle I want and put it on my timer switch. The only thing you have to be careful of is to make sure your idle switch is set to off when you plug the battery in. Otherwise, it won't work. I put the idle on my timer switch because that makes one less thing to remember. I was always forgetting my timer before, but I never forget the idle.

For Futaba Users Only

I go to PMX (pre-mix) and set throttle as master, and throttle as slave. Put the mix on a switch, and I like my "A" switch for that simply because that's where my timer has always been. Turn the TX on with the "A" switch in the off position, plug the battery in, turn the Airboss switch on. Let the ESC play the tune, then flip on the "A" switch and dial in the mix until the motor idles. I usually end up with around a minus 27 to minus 30 mix.

After that, be careful that the "A" switch is off before you do anything. When the ESC is turned on, it will look for the endpoints of the throttle range, and if the switch is in the on position, it will ignore the mix and it won't work.

The procedure is: "idle" switch off, radio on, airplane on, flip "A" switch to start idle. If you screw it up and the idle doesn't work, flip the "A" switch off, unplug the battery and start over.

I know it sounds very complicated, but that's just how it plays out in writing. If you could see me do it, you'de agree that it's really pretty simple. It just translates into 1000 words.

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