Cheap drive motors? [TANKS]

[Martin Helsing <martin.helsing-at-earthlink.net>]

I bought a couple of these motors a while back:

http://www.allelectronics.com/cgi-bin/item/DCM-267/400/DC_MOTOR,_3-24_VDC_.html

3-24V range, $3.50 per.

I didnt buy them for the tank. they were going to be used in a 1/144 battleship when 
I got around to building it.

I have since reviewed the specs and even saw a website for a guy who upgraded his 
Powerwheels with them.

I figure that a 3:1 gearing will give 5-6 mph at 12V.

I am not good with specs when it comes to electric motors though.

Any suggestions?

If worse comes to worse, would running 4 of them (powering the "idler" in addition 
to the drive sprocket) make a difference?

Thanks,
Martin
M1A1HA under contruction