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To: sci-military-moderated@moderators.isc.org
From: psl@interchange.ubc.ca (Paul Lakowski)
Newsgroups: sci.military.moderated
Subject: Re: WWII Armor types
Date: 30 Oct 2001 16:28:56 -0800
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cray74@hotmail.com (Mike Miller) wrote in message
news:<5dcb47db.0110300524.50487c31@posting.google.com>...
> psl@interchange.ubc.ca (Paul Lakowski) wrote in message
news:...
>
> > Looking at the anti heat theory the previously mentioned standoff
> > penetration figures for steel liner shaped charges [ WW-II HEAT]
> > suggest that since the PZfausts warhead standoff was only 0.4 to 0.6
> > cone diameters stand off.Which means that any amount of spaced plate
> > should have increased the penetration substitally . These 'Schnerzen'
> > plates offered standoff distance of about 66cm {Pz tracks #4} which is
> > 4.4 cone diameters for a Pzfaust. At these standoffs the penetration
> > should up 35-50% and not down at all.
>
> > The standoff on a bazzooka is ~ 2 cone diameters [J of Applied Phys
> > 1948 Vol 19, pp575]and the penetration should be ~ 2 cone diameters
> > penetration and any increase should reduce this penetration to 1.3
> > cone diameters @ 9:1 standoff ~ 51cm which is still a penetration of >
> > 3.5 inches RHA. Still more than enough to penetrate the side armor of
> > just about any tank in WW-II.
>
> Are you simply looking at standoff values for gauging the
> effectiveness of HEAT when triggered a spaced distance from the
> hull, or are you factoring in the effect on jet coherency
> after penetrating the spaced skirts?
>
> It would seem that after penetrating a spaced armor skirt, the
> jet from a HEAT munition would no longer be as coherent as
> one that simply passed through additional free space. I know
> penetrating the skirt would be trivial for the HEAT, but that
> does not mean the HEAT's jet stays "pencil-thin" after penetrating
> the skirt. High velocity impacts make matter do funny things.
>
> Mike Miller, Materials Engineer
Yes at this point the effect is just standoff, but the effect of the
plate is less than you suggest. Going on HD theory the plate will
obstruct until a sufficently large enough hole is driven though, at
which point the follow on jet material will continue on without
interuption. The effect of straight steel plate is substantial 3-4
times the plate thickness from the tests I've seen.With layered plates
[ steel aluminum] the disruption can be 7-10 times the plate
thickness. But once that plate is cleared the jet will continue on.