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Re: pneumatic catapults
You can see the inner workings of our catapult in the below image. We used 4x 7/8" bore cylinders, 4" stroke each.
We did not use the super high Cv solenoids automation direct sells (mainly because they are GIGANTIC). We used some smaller sized SMCs that we have used many times along our history.
One thing we did do though was limit the runs of tubing to as small as possible. To do this, we mounted the manifold & solenoids right next to the catapult cylinders.
Additionally, we created a 'pre-charge' tank @60psi to remove the pressure regulator from the flow path. This meant we had a black plastic Clippard tank @ 60psi right next to our manifold, which was right next to our cyilnders. Each shot from our catapult used about 1/3 of the black Clippard tank, which again helped as we maintained fairly consistent pressure in the entire system throughout each shot.
Good luck! We shot approximately ~12,000 test shots on 10 different prototypes to reach the final configuration we liked  .
-Brando
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MORT (Team 11) '01-'05 :
-2005 New Jersey Regional Chairman's Award Winners
-2013 MORT Hall of Fame Inductee
NUTRONs (Team 125) '05-???
2007 Boston Regional Winners
2008 & 2009 Boston Regional Driving Tomorrow's Technology Award
2010 Boston Regional Creativity Award
2011 Bayou Regional Finalists, Innovation in Control Award, Boston Regional Finalists, Industrial Design Award
2012 New York City Regional Winners, Boston Regional Finalists, IRI Mentor of the Year
2013 Orlando Regional Finalists, Industrial Design Award, Boston Regional Winners, Pine Tree Regional Finalists
2014 Rhode Island District Winners, Excellence in Engineering Award, Northeastern University District Winners, Industrial Design Award, Pine Tree District Chairman's Award, Pine Tree District Winners
2015 South Florida Regional Chairman's Award, NU District Winners, NEDCMP Industrial Design Award, Hopper Division Finalists, Hopper/Newton Gracious Professionalism Award
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