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Old Jan 21, 2003, 01:33 PM
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Mississauga, ON, Canada
Joined Dec 2002
68 Posts
Futaba T6XA Super: Twin motor, throttle-rudder mixing

Here's my problem:

I have an electric twin motor plane and I want to use the motors to yaw instead of using a rudder.

Here's what I was thinking:

Plug the ESC for the left motor to channel 3 (throttle)
Plug the ESC for the right motor to channel 4 (rudder)

Radio mixing:

PMX1: Master channel = 3 (throttle), slave channel = 4 (rudder). mixing is 100%. This should allow the right side motor to follow suite with the left hand motor.

To get differential steering:

PMX2: Master channel = 4 (rudder), slave channel = 3 (throttle). Mixing is %80 for left rudder and %120 for right rudder. A difference of %20 either way. When giving left rudder the left motor would turn at %80 of the speed of the right motor. This would yaw left. When giving right rudder the left motor would turn at %120 of the speed of the right motor. This would yaw right.

Am I correct?
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Old Jan 21, 2003, 02:25 PM
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Bonney Lake, WA
Joined Jan 2002
788 Posts
That sounds like it should work. One way to test is to plug a servo into channels 3 and 4 so you can see how the mixing will affect them. If you get the right servo movements then you should be good with the speed controllers.
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Old Jan 21, 2003, 03:08 PM
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Mississauga, ON, Canada
Joined Dec 2002
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That's what I thought. Other than elevon mixing I haven't played with some of the more advanced features on my T6X so I'm kindof new to this mixing business.

I was wondering about something else: I currently have elevon mixing (tailless aircraft) and with the twin motor differential yaw setup (if I can get it working) I was wondering if I can also use aileron/rudder mixing. I think it's labeled "2-->6 mix" on the T6X?

If I can get that mix working too then that would help too. For example: When I roll right, the "2-->6" mix would steer the rudder right, which in fact would just make the left motor spin faster than the right motor, and the plane could make a smoother right hand turn.

By the way, this is the plane I'm talking about (dual ESC not yet done in this picture):

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Old Jan 21, 2003, 03:32 PM
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Bonney Lake, WA
Joined Jan 2002
788 Posts
That might be a tough one. You can definitely activate the 1-4 mix and see what happens, but I'm not sure what will happen when mixing to another mix. It may be worth a shot. If that doesn't work, then dial in some elevon differential so that when you use aileron control, the elevon that goes up will travel further than the one going down.
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Old Jan 21, 2003, 10:35 PM
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Mississauga, ON, Canada
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I got it working. Check out this thread for details: http://www.rcgroups.com/forums/showt...threadid=87418
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