Basics

An aspect of naval engineering related to designing the hull
Mainly how to optimize it's geometry for the desired characteristics (stability, speed, and manuverabiliy)
Stil in progress (Also non-expert written)

Planar Hull vs Displacement Hull vs Semi Displacement Hulls

Planar is essentially flat, and planes over most of the water at target speed due to lift, thus reducing drag significantly (the extension of this is the hydrofoil)
- These are limited by the square–cube law and thus there are no large planar hull ships
Displacement Hulls Push Through the Water, and tend to be thin near the bow so as to "slice" more effectively

Plotting + math here related to the OS Kayak and other small stuff
Seems to be the more flat the hull is the easier it is to turn and to "get going" as well as max speed
- This comes with the downside of less stability (ie ease of "tipping over" due to little resistance to roll), and it is harder to passively hold a direction (called "tracking" ? ) (after paddling it will not stay in that straight line)