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<p>Seeing we had a demo. of ping pong ball shooter,</p>
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<p><a href="http://www.youtube.com/watch?v=YYNCGZCul1Q">http://www.youtube.com/watch?v=YYNCGZCul1Q</a></p>
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<p>and there is a Mythbuster's that just did this </p>
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<p><a href="http://www.discovery.com/tv-shows/mythbusters/videos/supersonic-ping-pong-high-speed.htm">http://www.discovery.com/tv-shows/mythbusters/videos/supersonic-ping-pong-high-speed.htm</a></p>
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<p>(Just have to find it through the other stuff on the site.)</p>
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<p>As we agreed that the balls flight speed seems to be limited to the speed of sound so could a method of variation might make it faster? The faster launchers use a compressed gas behind the ball in the vacuum tube, so suppose a denser gas was used like
sulfur hexafluoride? Would the ball go as fast as sound in that gas? </p>
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