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#1
31st January 2010, 07:18 PM
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Simple Question 20mm Becker
Ok,are the threads in the bottom of this projectile righty tighty,or lefty tighty? Last edited by Lou; 1st February 2010 at 07:02 PM. 
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#2
6th February 2010, 09:45 PM
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20mm becker
Hi my projectile has no base,there is no threads inside so it may be that they were pressed in,hope this helps.
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#3
6th February 2010, 11:19 PM
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Hi Lou,
I've got a coUple of these. they are just a press fit,i had to soak in oil for a few days to ease them out,then carefully scratched away at the primer comp,needs soaking too!. cheers Bob
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#4
8th February 2010, 04:28 PM
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Thanks guys,
Yes,it turned out it was a press fit plug. I wonder if design lasted long? One would think that at firing the plug and the shells contents would be left behind?
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#5
8th February 2010, 05:10 PM
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The pressure generated during firing is the same over the whole base of a shell when fired. So the tracer would see the same pressure as the rest of the shell, hence they would not tend to separate.
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#6
8th February 2010, 05:29 PM
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I agree with that,but "when lit" wouldnt the increased internal pressure push that plug out?
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#7
8th February 2010, 10:50 PM
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Load over area!
Go back to basic engineering and the equation of "Load over area" and you will see that the pressure over the tracer element will actually tend to seat it harder into the shell body.
__________________
CHRIS 
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#8
9th February 2010, 04:59 PM
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Think of Newton's Third Law as well, "For every action, there's an equal and opposite reaction."
The heated gases generated by the buring tracer should act in a similar manner as a rocket motor. Obviously there is no where near enough force to aid in propulsion but the idea meets the requirements in Newton's Law. This means that the tracer would seat itself further into the tracer cavity once ignited. The pressure is being exterted throughout the face of the tracer element.
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