Mike Mane wrote:
> Pardon my ignorance, when you say "under load", do you mean the motor  
> connected with all its final resistance such as gears and tracks?

Yes.  A direct measurement while underway is the best value to consider.

> Also, I was not planning to go as far as digital control. This is a  
> cheap, but important project and I hope I can get it running.

Then, as previously suggested, you should manually compensate for any 
drift while driving it.   That's the cheapest and most effective way to 
get a tank to go straight, because most brains can easily compensate for 
many, many different situations, such as uneven terrain, bumps, poor 
traction, etc.  Electronic solutions can never come close, without 
spending lots of money.

        Frank P.

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