Reply To: Seeking air stripper info

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I_Like_Irons
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When I built my air stripper (no shroud), I chose the gap to be the bore diameter long.  The diameter of the stripper for a caliber .177″ is .225″.  The cone is 45 degrees included angle and creates a sharp edge.  I have six vents (5/32″ x 1/2″) that give a total gap area of .469 square inches. 

This is by no means the only approach.  Many are right angles to the bore with round vent holes.