The motors you are looking at are great for  airplanes but for heavy tanks 
they dont have the torque.  They have  reasonable hp but they dont have the 
power.  They only have 680 watts.. not 800.  I have many brushless motors 
in my rc cars.. up to 3 hp for a 25 lb buggy that used to have a 30cc gas 
motor.  It works great for that .. but it does not have the torque to move 
heavy objects.  The big brushed motors have big magnets and wiring  so they 
can move a wheel chair or scooter weighing 200lbs or more.  You say that 
the regulators.. ESC... are  difficult to find, they are easy to find and 
are very cheap.  I think that the motors you are talking about will not 
work in anything that is 1/6 scale.  
I have many electric motors of all sizes and types..  for tanks you need a 
tank size motor.  
My 2 cents worth..  
Garnet

On Friday, 29 March 2013 03:40:41 UTC-6, Niels Erik Kristensen wrote:
>
> Why du everyone use big heavy and week brushed motors? Most of you use 
> motors that weight about 1 kilo, and only give 350-400 watt-And cost 60 usd 
> ore more.
> Furtermore its dificult to buy regulators to them, so many "tankers" 
> control there tanks with a system of relays?
>  
>  
> In my plans i will use cheap, light and powerfull brushless motors, and 
> real regulators with propotional control in both forward and rewerse-With 
> brake:-)
>  
> The motor i will use weight about 200 grams, and give about 800 watt on 4S 
> lipo battery ( 14,8 volt) And i will control the motors with a 50 A boat 
> regulator-Watercooled and with a max boost to 60 Amp. The regulator give me 
> full control both forward and reverse, with brake.
>  
> My motor cost under 13 usd!! The regulator cost about 18 usd
>  
>  
>

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