Re: Berms

Just filling in some details:

> > > 73mm RCLR HEAT Round is stopped by:
> >
> >These are numbers to stop the round.  Does the imply that
> >X% (say 30%) of this amount will make it innafective versus
> >heavy armour?  Or is this the army manual saying this is
> >the minimum volume needed to make the rounds survivable?
>
>It's off a chart entitled "Material Thickness, in
>Inches, Required to Protect Against Direct Fire HE
>Shaped-Charge" on page 3-12 of FM 5-103 Survivability.

The 73mm HEAT - the original RPG-7/SPG-9 round, and also the one fired
by 
the low-pressure gun of a BMP-1 so it's not just RCLR - is impact-fused,
so 
simply hitting the berm detonates it. I suspect that John's figures are
the 
thicknesses necessary to stop the round from harming infantry behind the

obstacle - they're in the right ballpark for that, anyway.

FWIW this particular round isn't a threat to heavy armour. It can still 
hurt modern tanks if it hits rear/top/bottom armour, and some places in
the 
sides, but that's because modern tanks usually don't have very heavy
armour 
there :-/

/Oerjan
oerjan.ohlson@telia.com

"Life is like a sewer.
  What you get out of it, depends on what you put into it."