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Some government boats have jet drives. In this post from early September 2014, the smaller vessel had jet drive, whereas the larger one–propellers, although I can find no info about , eg, their diameter.
The other day in the East River I encountered FDNY’s newest (?) vessel, William M. Feehan. Click here for Feehan‘s dedication in the sixth boro.
Feehan‘s 3450 hp, generated by three Caterpillar C-18 engines, gets propelled by three HJ 403 Hamilton jets.
Speeds are slightly faster in fresh water, but both fresh and salt water need to be in liquid state.
USS Little Rock‘s 96,000 hp are to no avail when water converts to solid state, even with just some chunks of solid, because of the otherwise highly desirable waterjets. For complete specs on USS Little Rock LCS-9, click here.
The photo above comes via Marc Piché and was taken by René Beauchamp. All others by Will Van Dorp.
tugster: a waterblog 
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