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T H IS PAG E D EC LA SSIFIED IAW E 12958
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onl y by employing the arm or-piercin FC 1000RS bomb .
Th e PC
1000RS also has the greatest ch ances o f sinking the
.
"$ueen Elizabeth" ,
but its high penetrative szss
capability of
180 - mm armor-plate steel is not actually needed to deal a deathly
blow to the ia cxpxmt old vessel that is so badly protected
against bombs .
Th e penetrative pow er of the PC 1000 , which i s 100 - mm ,
•
is fully satisfactory for
the "Queen Elizabeth't , excegt that the
exp l osive char e of 352 lbs does not suffice to tear the ship apart .
To destroy the innate strength
of a warship ,
the bomb that penetrates
below
deck would have to contain a quantity of explos i ves
equivalent to o . ol per thousand of the water displac®m ent .
In
the case of the " ueen El izabeth" thi s wou ld amount to 66 0 pounds ,
and for the "Dorsetshir e" some 220 lbs of explosives Would be needed .
Th e armor-piercing PC 1400 an d PC 500 contain that much
explos ve
matter .
The l a tter bomb rvould suffice ,
if it was ma de of ordinary
nonalloy steel ,
in which case it would be desigaated SD 500B .
(It
is not to be conf use d rrith the SD 5a0A , which is a multiple-purpose
bomb for achieving high fragmentation effpct .
)
To i xidcsx t explode tbe ammunition romms of a
s hi p it is
ufficien t to use an explosive charge of 11A - 220 lbs , according
to experiencP factors .
Th e PC 500RS and PD 500 can
therefore aot
be considered as standard bombs for this purpose since they contain
orly 27 .
5 and 63 .
8 lbs of uplosives , respectivply .
The PC 18®ORS ,
°-i t h i t e + 8 + l bs of compr es 6e d hi g h - pe r f ormanc e expl oe i ves , c or r s s ponds
to th e PC 1400 vtith its 66 0 lbs of normal explosives ,
b»t when its
iṃpac t resistan ce strength was tes t ed on a ranite surface ,
doubts
THIS PAGE DECLASSIFIED IAW E 12958