The concept here is intriguing.
Take a high pressure, high volume pump and direct it's output where you need it.
This is opposed to the traditional thruster methodology of taking a low pressure high volume pump and installing it directly perpendicular to the hull.
The challenges are significant but not impossible to overcome. For example I did not notice sea cocks on these huge below the waterline through hulls. That seems like a risk to me, but the design could be modified to utilize a proper sea cock.
What I am wondering is if this concept of a pump and high pressure seawater stream could be used to provide roll dampening. If that worked out then it would provide an alternative to traditional fin stabilizers.
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