Air Venturi Carbon Fiber AirTank - (100cu-in / 74cu-ft / 98cu-ft)

The Magnus effect is a phenomenon most commonly seen in ball sports, where spherical or cylindrical objects pass through the air towards some kind of target. The long and short of it is that as an object moves through the air, air flows around it like you might see in a wind-tunnel demonstration. When backspin is applied to the top of a spherical or cylindrical object, like a BB, the air-flow is deflected downwards. At this point, Newton’s Third Law (i.e. for every action there is an equal and opposite reaction) comes into play. As the back spinning BB “pushes” the air on its top side downward, the air coming from the bottom effectively “pushes” the BB back up, lifting it and letting it travel further. In other words, a BB of a given weight that would normally start dropping to the ground at, say, 50 feet will continue staying relatively flat, moving forwards and traveling a greater distance to hit a target at, say, 80 feet instead. The greater the backspin, the greater the disruption to the airflow on the topside, the greater the lift provided by the opposite reaction.

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Umarex Hammer - How To Fill with Air Instructions