As far as high speed is concerned, bow planes are rigged out when going really fast since a malfunction causing the boat to dive will allow the boat to pass into it's destruction zone too quickly when going at high speed.

Skip Asay
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That statement alone makes my point ,the bow plains are very very important,let me know if a submarine would go to sea without its bow plains operational.

Also why are bow plains used on modern subs toaday yes they do know what they are doing and yes from experiance from NOT doing it.

If the mighty Typhoon had her bow plains stuck in retracted she would be vertualy impossible to control her depth especialy under the ice!

Bow plains to me are as important as a subs rudder to put it simply .

Dave