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The 3 and 4 wheel versions are on totally seperate levels of complexity. The 3 wheel has to have the same motor because different motors even geared the same would offer different torque. In the 3 wheel design the motors never really drive "straight" so even if the wheel is turning at 10 ft/s because of the angle the bot actually only moves a fraction of the speed.
In a 4 motor design each set of opposite wheels works on a seperate independent axis. So if one set of the wheels was mvoign at 6ft/s and the other at 8ft/s then the bot would actually move at about 10ft at at angle. I'm not usre how the different torques would effect the turing fo a 4 wheel version though.
I'm looking forward to seeing the drivetrains this year and even more so next year. It seems a 2 speed is now almost standard. Hopefully next year more teams will run kiwis and the new technokat mouse drive.
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