Re: 2 wheels vs 1 wheel in a linear shooter
 

To allow for more contact time with the frisbee so the acceleration can be distributed over 2 wheels instead of just 1, to minimize slipping and improve final exit speed and consistency.

Lots of discussion going on about this in this thread, and other threads.

Re: 2 wheels vs 1 wheel in a linear shooter
 

https://www.youtube.com/watch?v=ARUhI8Qob5w

This is our prototype 1 wheel shooter. We made a 2-wheel shooter but the video we have of it is poor in quality. We will post a new video of the 2-wheel in the very near future.

Here is the video anyways: http://www.youtube.com/watch?v=EYpbyVbMbD8

Re: 2 wheels vs 1 wheel in a linear shooter
 

If you wanted a long time for contact in a linear shooter couldn't you use a belt instead of a wheel?

Re: 2 wheels vs 1 wheel in a linear shooter
 

This was mentioned in post #10, and also here.

Re: 2 wheels vs 1 wheel in a linear shooter
 

Theoretically yes, but practically no. A few people have tried it and had serious issues with it.