Question about British 3 inch Rockets?

"...for rocket launching the correct dive angle was 15degrees and the
ideal hit was to have them hit the water 150ft short of the target as
they were designed to level out 12feet below the surface. An ideal hit
on the hull of the ship would result with a 1ft square hole on entry
and if it made it to the other side the rocket would make a hole 2ft
square"

Is this accurate or BS?

I've heard a lot of myths concerning rockets and water strikes.

Rob

.

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