[TorpX]

Originally Posted by Mowgli

I wonder if an open tube as an impact on speed and fuel consumption?

I think the impact there would be too small to measure. A bigger problem would be the effect on your torpedo. In RL, torpedoes required a great deal of checking and maintenance; leaving one to bathe in seawater would be a no-no.

Also, the interior doors of the tubes are not as strong as the exterior doors. Having only the interior door between you and the sea, in a depth charge attack, would most likely be fatal. You could probably not dive deep with the outer doors open.