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"erik kump" <ebkump-at-hotmail.com>
Re: High-Low gears [TANKS]
Thu, 03 Feb 2005 07:43:45 -0500
>From: Frank Pittelli 1) use a fixed transmission and vary the voltage to
I thought about this one first, but it is working backwards from what I
want. If I understand correctly: A specific gear ratio running at 12v will
produce X rpm's and Y in/lbs of torque. If you switch the same setup to 6v,
then it produces 1/2 X rpm's and 1/4 Y in/lbs of torque. Conversely,
switching to 24v will produce 2 X rpm's and 4 Y in/lbs of torque. So
lowering the voltage to gain a lower speed range actually reduces it's
ability to handle rough terrain.
>2) use a fixed voltage and transmission, and vary the motor windings,
I'm not sure what you mean by this.
>In both cases, however, the key to success is finding the right
>transmission ratio(s) for the motors/batteries/tracks/vehicle being used,
>under the expected loads. In theory, the ratios can be calculated, but at
>some point you have to simply put it on the field and measure the
>performance to truly find the optimal settings.
Good idea. I don't know the speed capabilities of the average operational
tank though. Do you think my speed ranges would be a good starting point to
aim for? 2-3mph for low gear, 4-6 for mid, and 8-10 for high? Thanks for the
Erik 'speed demon' Kump