[iambujo]

We started with a 4 wheel pitcher (like the early ones in videos here), it ran on 2 CIMs while we were waiting for the AM FP gear motors. Each axle had 2 narrow wheels.

Based on some further discussions we prototyped a single wheel, 1 motor design, as seen in other videos.

Real world results - we have found simple is better and we are going that route (hint hint). We get a really nice trajectory and consistent backspin. The key seems to be in tuning the angle and length of the box 'lid'. And consistent ball insertion.

One thing we found in quick testing is that the 4 wheel method was a lot more touchy, if the ball didn't contact all 4 wheels smoothly and at the same time it created erratic shots.

Either design will work and I am sure we will see plenty of both, but a single bottom wheel looks good to us.