The Mortar Brig is basically the regular brig with mortars, due to the addition of mortars some cannons are removed and her sailing qualities are highly diminished, She is currently the only ship with mortars.
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The Mortar brig is the slowest ship in the game currently and has a very poor turn rate, however she does have the advantage of being the only ship with mortars, which can do a massive amount of damage.
Here is the Sailing Profile for the Mortar Brig. She handles most like her larger sister ship the Navy Brig. She handles best on a broad reach and is relatively comfortable with the wind anywhere abaft her beam. She does lose a fair amount of speed when running the wind. Likewise, she experiences the normal square-rigged loss of speed when sailing upwind. Notably, however, she displays an odd specific fondness for point 45, where she performs strangely better than the surrounding points.
How to get Crafting recipe
You get the recipe of the Navy Brig when you reach crafting level 10, and you can craft her at this level.