I've got a Self Imposed Restriction. No changing the trigger once it's in the tube.
(They'd have to pull it partialy out to do this).
Partly due to this I keep everything set to impact.
Other reasons:
Impact is more reliable.
I can set, and leave, my depth setting at 3 Meters.
BDU forbid use of magnetics for a time.
In a convoy situation I don't want to spend time setting depths.
A further reason:
SH3 magnetics seem to have a very high success rate against warships.
The reality is ALL USN warships did and do undergo degausing (demagnification).
(Helpful against magnetic mines, as well as torpedoes).
I would have to assume that all RN warships underwent the same treatment.
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