Squirrels have fuzzy tails.
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I dont recomend this design. The bigger the wheel, the weaker the torque.
About the motors, dont use stearing and diff gears for two reasons: difficult to build and only one motor for power. There are a number of reasons for cars to use diff. gears and the biggest is the fact that you cant precisely control the rotation speed of an engine. If you had 2 engines one connect to each wheel it would be very difficult to drive the car. Some electric cars I have seen use 2 motors. Some with double steering use 8. If you use diff steering in your robot you will need a very big motor in order to defeat the opponents. Also you would lose a lot of mobility. Using a normal robot I could easyly move to your side and and push you while you would be wasting time steering. I recommend 2 steeper motors connected to small wheels. The higher the torque the better.
I dont recomend this design. The bigger the wheel, the weaker the torque. It will be easier to push your robot backwards. About the motors, dont use stearing and diff gears for two reasons: difficult to build and only one motor for power. There are a number of reasons for cars to use diff. gears and the biggest is the fact that you cant precisely control the rotation speed of an engine. If you had 2 engines one connect to each wheel it would be very difficult to drive the car. Some electric cars I have seen use 2 motors. Some with double steering use 8. If you use diff steering in your robot you will need a very big motor in order to defeat the opponents. Also you would lose a lot of mobility. Using a normal robot I could easyly move to your side and and push you while you would be wasting time steering. I recommend 2 steeper motors connected to small wheels. The higher the torque the better.