In article , Keith Willshaw
writes
"Howard Berkowitz" wrote in message
...
In article , "Keith Willshaw"
wrote:
SNIP rocky bits
You are the only one fixated on granite.
You may recall that the only weapons able to
penetrate the concrete U-Boat pens were the
Tallboys and Grandslam weapons used by the
RAF and the former were definitel marginal
against some of the later pens
We had this discussion last year, I recall archiving your excellent
description of pen construction.
I read elsewhere that some Grandslams were observe to embed themselves
up to 10-12 feet in the pen roof of one site (forget which) before going
bang. The Terrell rocket-propelled bombs provably got through 20 feet
of pen roof, but with a light (500 pound) charge. (Actually an
advantage - the blast trashed the pens contents but left the structures
intact for the mushroom growers...)
Cheers,
Dave
--
Dave Eadsforth
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