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Christian Reed made this Instructable that shows us how to build a Grappling Hook Launch Cannon. Where was this Instructable when I couldn’t find my ladder last week. The final version begins with the CO2 coming from a paintball cylinder. It enters the gun through a check valve (to ensure it does not come out once it enters the tank) and then a Quick Exhaust Valve (QEV). The tank has a gauge on it to show pressure, a blow off safety valve which releases air over 175psi to ensure nothing bursts (although the system can probably handle up to 300psi). When the air is fully charged, a blow gun is used to change the direction of flow in the valve to allow the air in the tank to exit through the barrel and hence launching the projectile.
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