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Originally Posted by Squirrelrock
617 has so far made a prototype with AC drills driving the top and bottom wheels on the softball-style shooter, with the top one smaller than the bottom wheel. The bottom wheel was the 12ish inch pneumatic wheel from two years ago, and the top "wheel" was two 5 inch diameter wheels duct taped together on a shaft so that there was a depression between them. The speeds that we shot at were right around max depending on the speeds of the wheels. We got some major backspin and can hit the goal's center consistantly from midfield.
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We have some major backspin as well, but without a wheel moving on top... In our case the backspin also causes a very accurate shooting mechanism. There was no need for extra barrel.