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I'm actually inclined to believe the variant where they can't. When looking at a Soviet submarine, you may notice its tubes are at the top of the bow and fire straight out. There were actually proposals to move the tubes to the "American" position so the bow can go for a big spherical sonar (and trying to get as much aperture for the sonar as possible is undoubtedly important to the Soviets with their noisier subs and less advanced electronics). The current form is selected because the calculated speed limit was 11 knots. It is a Path Not Taken for the Soviets and AFAIK the American limit was higher (18 knots IIRC), probably due to improvments made in optimizing this mode of launch, but the Americans are not immune from hydrodynamics.
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I'm intrigued with this here. What specifically are you referring to in reference to hydrodynamics? The movement of the water over the hull basically torquing the torpedo as it exits from the tube? I'm not a fluid engineer, but I'd be tempted to say that it wouldn't be difficult to have a strake, bump, etc to create an area of low pressure to allow the torpedo to exit the tube with no issue. Shoot even some carefully crafted irregularity at the tube opening when the door is opened could create the effect. It's not like the torpedo is exit the tube at 90 degree's, depending on the exact exit path it might have as little as 25" or so of surface area exposed to the drag of the water. If some fancy engineering can be brought into play the drag forces (and hence torque) would be minimal.
-Jenrick