Justin,
There are ways to analyze your situation using the "Behavioral Modeling Extension" (BMX). There was a presentation given a number of years ago at the annual PTC/User conference that shared a method to assess a boat for buoyancy and stability using BMX. I believe you can answer most of your questions with this tool, as Don also mentions. You will not be able to answer "how fast it will go" unless you use a CFD tool - and that would be a fairly involved study by itself! If I can find a reference to this presentation, I will add it to this thread. Bottom line is, first principals are used to help solve your problem through leveraging accurate CAD models and engineering relations in BMX.
Chris