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Old Mar 16, 2012, 10:09 AM
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United States, TX, La Porte
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Question
Motor control unit for Dumas 1/20th PT

I know this is a long shot but I thought I would ask the question. Does anyone make a magic box that will allow three motors and three speed controls to be used in such a way as to run just the center motor at low speed. Then as you apply more power the two outboard motors kick in. I know you could do it with multi channel radios but I would like it to work with just a two channel set. Like I said I doubt there is such a thing to just buy and plug in but you never know.

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Old Mar 16, 2012, 10:56 AM
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That reminds me, I owe you a response Grav!

How are you with wires and soldering irons?
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Old Mar 16, 2012, 11:28 AM
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Maybe you could apply the Action-Electronics motor mixer to do that for you.

http://www.action-electronics.co.uk/mixers.php
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Old Mar 16, 2012, 01:10 PM
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It does tank steering, but not the third motor ramp up like my PT's controller.
Grav- I can provide same, programmed, but any needed tweaks will be difficult!
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Old Mar 16, 2012, 03:21 PM
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It just needs programmable ESCs - many need to be set up, the centre one just needs to be set so that it has a narrow dead band, full speed at a low stick setting, and the ability to carry on giving full speed when getting a signal outside its programmed limits. That lets Mtroniks out.
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Old Mar 16, 2012, 04:30 PM
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Here the Action-Electronic's mixer instructions show that it can run three motors, on a two channel receiver.

Bottom of the page at Harbor Models...
http://www.harbormodels.com/site08/m...d_controls.htm

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Old Mar 16, 2012, 04:35 PM
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Yes, but it won't ramp up the middle one to 50%, THEN bring in the wing motors. I use this to cruise on one motor... With a 2ch radio. I tried the Action unit, tossed it, strange and uncustomizable transition between straight and turning.
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Old Mar 16, 2012, 05:18 PM
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OK with all that has been said about the motor mixer P40c I have one question.
I am interested in your system how much for one already built and ready to install?
the reason for this question is simple there are those of us who are not programmer's and would just like to install your unit, that leads to the next question Do you sell the mixer you designed?

thanks again
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Old Mar 16, 2012, 05:57 PM
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Aye, there's the rub... the unit I used for my controller is now obsolete, no longer produced... shame, because it was handy for plugging in to 12v and multiple ESCs.
I could replicate it with newer hardware, but it will require lots of fiddly time consuming assembly of bits and wires, making it unreasonable for me to produce for the 1 or 2 folks who'd like one.
Grav, never mind...
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Old Mar 16, 2012, 06:54 PM
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GRAVEMAN- If you have a speed control that will handle the current for all three motors, you can make a system to do what you want with a servo Y harness and a servo to trip a micro switch ( 25 amp rating) when the throttles are at half speed forward. The micro switch would have a positive lead tapped from the speed control output to a split Y to both out side motors. The out side motors would start running at half speed when the switch is tripped and then run up with speed with the center motor.

Any thing less than half throttle forward you would be running only on the center motor and you will only have reverse on the center motor.
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Old Mar 16, 2012, 08:32 PM
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Thanks guys I will consider options for trying this. I will see what I can figure out.
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Old Mar 17, 2012, 05:59 AM
Ragbagger
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St Simons Island Georgia
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Motor Controls ion Dumas 1/20th PT

It would seem soooo easy to just go back 30 years in technology and use one of the many extra channels on the radio and servo hooked to an old manual switch to cut the wing engines in and out.

simple, effective, and cheap
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Old Mar 17, 2012, 12:00 PM
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Hi Patmat

Just out of curiosity what was the Max running time on your set up for the PT 41.

Thanks
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Old Mar 17, 2012, 12:40 PM
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How long a time can you drive your car? It all depends!
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