: Hello Again
: Thanks for your answers to previous questions.

: Building a Breat Aul Double.

: At the point of having to install or not install a rudder.

: Although not a necessity is it nice to have?

: Thanks
: Murray

As Bill said. However, depending on your boat, you might need one. Some designs don't turn real well whether you lean the boat or lengthen the paddle on one side and then in a quartering wind a rudder can save you a lot of work on one side and increase your range.
JohnK