Sorry maybe I wasnt 100% clear above. Lets say your normal Flank Surface speed is 17Knts, your submerged Flank Speed 7Knts. Raise the Snorkel when submerged, with both Diesel engines going, and you get 23Knts. Do a partial submerge with or with out snorkel to a depth of 7-8m and you can now do 24Knts. On a Type VII/IX doing the above can give you a 4-6Knt increase in speed above the normal rated flank speed of the boat.
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