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Rifles, Reloading, Optics, Equipment
Reloading
New case design!
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<blockquote data-quote="abinok" data-source="post: 95821" data-attributes="member: 16"><p>[ QUOTE ]</p><p> How about figgerin' a way to chamber a convergent/divergent nozzle instead of of the straight convergent we now have (Shoulder/neck). </p><p></p><p>[/ QUOTE ] </p><p>Roy... bad idea.</p><p>The entire idea behind the DeLaval nozzle is to increase velocity of the ejected gas in open air. Restricting the exhaust side of a DeLaval nozzle inside a long tube like a rifle barrel results in condition known as the Bernoulli Lock Effect, or Krushnic Effect: This happens when the nozzle is recessed into a tube by more than one tube diameter. If so recessed, the cylindrical volume below the nozzle forms a secondary expansion chamber which allows the exhaust gasses to expand below atmospheric pressure before leaving the tube. A multi-stage rocket that ejects its booster motor, but not the airframe, is a perfect example. Very damaging; it almost always destroys the lower body airframe beyond use. Named for Richard Krushnic, the rocketeer who characterized the effect in the late '60s.</p><p>Seen and experenced it myself more times than id care to admit. It SUCKS Literally! /ubbthreads/images/graemlins/smile.gif</p></blockquote><p></p>
[QUOTE="abinok, post: 95821, member: 16"] [ QUOTE ] How about figgerin' a way to chamber a convergent/divergent nozzle instead of of the straight convergent we now have (Shoulder/neck). [/ QUOTE ] Roy... bad idea. The entire idea behind the DeLaval nozzle is to increase velocity of the ejected gas in open air. Restricting the exhaust side of a DeLaval nozzle inside a long tube like a rifle barrel results in condition known as the Bernoulli Lock Effect, or Krushnic Effect: This happens when the nozzle is recessed into a tube by more than one tube diameter. If so recessed, the cylindrical volume below the nozzle forms a secondary expansion chamber which allows the exhaust gasses to expand below atmospheric pressure before leaving the tube. A multi-stage rocket that ejects its booster motor, but not the airframe, is a perfect example. Very damaging; it almost always destroys the lower body airframe beyond use. Named for Richard Krushnic, the rocketeer who characterized the effect in the late '60s. Seen and experenced it myself more times than id care to admit. It SUCKS Literally! [img]/ubbthreads/images/graemlins/smile.gif[/img] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
New case design!
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