The simple answer to this question is no, a longer rudder is not necessarily better. In fact, there are many factors that go into determining the optimal length for a rudder, including the size and type of vessel, the waters it will be navigating, and the preferences of the captain and crew. That said, let's take a closer look at some of the pros and cons of longer rudders to help you make the best decision for your boat.
One advantage of having a longer rudder is that it can provide more control over the vessel when steering. This can be especially helpful in windy conditions or when maneuvering in tight spaces. Additionally, a longer rudder can also offer greater resistance to lateral forces (such as waves) acting on the hull, which can improve tracking stability.
However, there are also some potential downsides to consider before lengthening your rudder. First and foremost among these is increased drag; a longer rudder will create more drag than a shorter one due to its increased surface area. This can negatively impact fuel efficiency and speed, particularly on larger vessels. Additionally, longer rudders may also be more susceptible to damage from collision or grounding since they stick out further from the hull.