Making it more powerful? Answered
I have brought a sphero 2.0 which for those who don't know it a robotic ball about the size of a baseball. I decided to try and make a car for it out of knex although I will only be able to make it go backwards and forwards. I built a frame thing with a small wheel in the middle of it and sphero sits on top. The axle that the wheel is on has a gear which then connects to the drive wheel axles on the back using another gear. This works fine when in the air but when on the ground it's too heavy for sphero to power it. I've tried putting bigger gears on the front and vice versa, i've also tried using a pulley but it just isn't budging at all.
Say if I was using the standard knex motors how would I go about making it produce more power?