I am using a simple robot kit from parallax and everyone in my class wants to increase the wheel size, the amount of power supplied to the servos is constant, but I am having trouble seeing how this makes the robot that much quicker. It seems like the servos need to work harder with a larger wheel and yes it will be faster, but our servos can’t work any harder then they already are on the smaller wheels. I was just wondering if this is a true statement and if anyone had any other ideas to make our robot a little bit quicker.

Keep in mind the programming is sending max power to the servos, so we can’t do anything in that sense. I was hoping for some hardware tips.

If it’s true that the servos are the optimal design for the load and the wheel size, then changing the wheel size won’t help.

BUT, all designs are not optimal. It may well be that the servos have excess torque. In that case larger wheels may speed it up. Try resisting the motion with your hand, that may tell you something.

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why not make the wheels smaller (if in fact the larger wheels require more energy).

References :just some dud, hope i can help

http://www.nightrider.com/biketech/calc_formulas_page.htm

Formulas for tire size & their effect

effective ratio = (old tire diameter / new tire diameter) x original ratio

actual mph = (new tire diameter / old tire diameter) x actual mph

Formulas for g force & weight transfer

drive wheel torque = flywheel torque x first gear x final drive x 0.85

wheel thrust = drive wheel torque / rolling radius

g = wheel thrust / weight

weight transfer = weight x cg height / wheelbase x g

lateral acceleration = 1.227 x radius / time^2

lateral weight transfer = weight x cg height / wheel track x g

centrifugal force = weight x g

References :If it’s true that the servos are the optimal design for the load and the wheel size, then changing the wheel size won’t help.

BUT, all designs are not optimal. It may well be that the servos have excess torque. In that case larger wheels may speed it up. Try resisting the motion with your hand, that may tell you something.

.

References :