x1 is an aquatic boat/ship/vessel for carrying x2, propelled by x3.
This is a vessel which floats on the surface of a sufficiently large body of water. bloti is too vague/general for this specific sense (for example, a spaceship (kesyblo) is arguably also a bloti, even though it is nothing like a jaursfeblo in its actual mechanics). liksfeblo is more general (not designed only for water surfaces); flublo is more general still, possibly encompassing airplanes, hot-air balloons, etc. Use jirblo for submarines/submersibles/U-boats/etc. (for any liquid).