1:1 gear ratio on 2 775 pros. 75% throttle will get you about the distance from the back side of the “wheel of fortune”. The ball has about 1 inch of compression while being shot. We noticed that the robot will take a large amp hit when the ball is shot, so we had to amp limit the motor through the Talon SRX to not trip the snap action breakers. I recommend running them on 40 amp breakers.
A little on the design and material.
Side plates are 1/4" polycarb.
The supports are all-thread rods with nuts on both sides of polycarb.
Outside wheels are 6 inch AndyMark HiGrip Wheels Blue wheels.
Middle wheel is 4 inch AndyMark HiGrip White Wheel.
Not sure on the distance from middle of axle to back plate, but i know its equidistant around that axle to the back plate.
On the software side distance can be controlled with an encoder and velocity control. With the relatively flat trajectory it is very forgiving on the “sweet spot” you have to be on the field to hit your target. Keep the speed high, the trajectory flat and you have a lot of buffer for distance to hit your target.
If you have any other questions feel free to post them here.