Sailor Steve is a better man than me! In most seas you will take water over the sail unless near flat. I have swallowed enough water to know!
Besides, the smell of upchucked pigs feet below is bad. Oh yes, I have an immersion bucket of water and a pickled pigs feet spray aerosol can for sub simming. Jimbuna sells them.
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html