VELOCITY OF BOMBS
The strength required for defences against air raids was explained in an address to the Southland branch of tin: New Zealand Institution of Engineers bv Mr. W. 11. Gregory. He said it was estimated that the striking velocity of a very heavy bomb was 1200 ft. a second, and small incendiary bombs would reach a velocity of about 400 ft. a second. The estimated vertical penetration of a 20001 b. bomb into the ground would not exceed 60ft. Tests showed that a 5001 b. bomb would penetrate 2ft. Gin. of concrete and about 20ft. of sand or earth.
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https://paperspast.natlib.govt.nz/newspapers/GISH19391027.2.9
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Gisborne Herald, Volume LXVI, Issue 20079, 27 October 1939, Page 2
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101VELOCITY OF BOMBS Gisborne Herald, Volume LXVI, Issue 20079, 27 October 1939, Page 2
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