This is true, also increases the cost factor by 2X.
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Are we talking beetleweight, or something bigger? The controllers under 20A are not all that expensive. personally, I would go with one bigger moter & ESC - half as much work to mount it.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Featherweight...
I'm too unsure on it to really talk about it much, but might well be using a brushless motor. I had a thought I could use just one and run the other side on a castor wheel, that might work a bit better.
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http://www.unitedhobbies.com/UNITEDHOBBIES/store/comersus_viewItem.asp?idProduct=4813
Interesting... Looks battle worthy to me...

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Jeti makes excellent brushless ESC's.

Take a look see here...
http://www.castlecreations.com/

Okay, I'm pitching some ideas around at the moment. I'm having a glance at brushless. I'm looking for a motor between 1Kw and 1.2Kw, between 5000 and 8000rpm @ 18v. I don't need high RPM, I just need torque. The biggest problem I see is controllers. I'm wondering what some of the electronics guru's think about this, but how hard is it to build a simple ON/OFF sensor'd brushless controller with REV?

How feasible would a PIC running 3 small half-bridge fet drivers to power 12 x IRF1407 fets with a bit of ADC feedback for positioning??

What are the possible draw backs to this?
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https://www.halfdonethings.com/

I think you are looking for a motor that doesn't exist and if it did, it would be a special, expensive industrial item. Use off the shelf parts and go for a high efficiency brushed motor that reverses easily. Sounds like you are building an electric flipper to me...
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Torcman seem to be the only guys that make decent brushless motors within this spec.

http://torcman.de/motoren/tm430/tm430_e.htm - 800-2500watt motors.
http://torcman.de/motoren/tm685/tm685_e.htm - 1500-4500watt motors.

They are just pricey and I was hoping someone else would have an alternate to them.

I've currently got a 14.4v Dewalt motor (400watt according to Dewalt) @ 18v designed for it, but can see it being under powered.
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https://www.halfdonethings.com/

The Torcman motors are just biggr than other outrunners, they are still relatively low torque at startup, for the reasons Jake posted about. For the money, I would get a short Mag and save weight in some other part of the bot with titanium - same overall price for the bot and likely a better balance of weapon vs armour. The controller will be WAY cheaper & easier for the Mag as well.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

If you want to play with brushless controllers, grab yourself an F&P washing machine motor, wire it for 24V, and have fun.

http://www.users.bigpond.com/solarbbq/bikeexp/bexp.htm
(look halfway down)

I haven't looked at brushless, since I have a love affair with 3-phase .

Already played with the F&P motors. They are very cool. They are about 10 times to big for my needs
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https://www.halfdonethings.com/

gimme one of those!
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The Engine Whisperer - fixer of things

you could probably do it with a standard pic if you used some "glue".
basically AND the outputs of your drive signal with a PWM out.

Alternately do what i am doing and use a 18F4553 (i think) with 4x PWM outputs in the one chip (4 *pairs* that is with adjustable deadtime).
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Mechanical engineers build weapons, civil engineers build targets

https://www.unitedhobbies.com/UNITEDHOBBIES/store/uh_viewItem.asp?idProduct=5144
You should have gotton this one glen! 10mm shaft!
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