They, in the meantime had sunk over 600 ships. By 1941, the
U-boats were able to operate directly from the Bay of Biscay
(because France had fallen) and this meant easier refueling
and faster 'turn around times'. They hunted convoys in 'Wolf
Packs' with terrifying success. The allied losses were now
a quarter of a million tons of shipping per month plus the
sad loss of many men and their precious cargoes.
'Taffy' Bowen's display of AI /ASV equipment in September
1937 had demonstrated that radar could detect surface vessels
but in November 1939, Admiral Somerville asked him if his
system could detect something as small as a submarine. Bowen
rapidly set up a demonstration in the Solent and demonstrated
that his 1.5 m ASV equipment could detect a submarine from
5000 feet at a distance of 6 miles but actual operational
results were inconclusive due to a number of factors including
poor crew training. The equipment did not seem to be reliable
and so all through 1940 and most of 1941 the carnage continued
.
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