The Adirondack guide boat is a fast and easy rowing boat. While it tends to be tippy, this is a result of what makes it fast: its narrow waterline. The distinct flare gives it strong secondary stability.
It was originally developed in the Adirondack region of upstate New York where guides would bring customers out onto the lakes to fish and hunt. In order to get to the prime fishing spots before other competing guides, the boats had to be fast and efficient when rowed. The boats also needed to be lightweight and easy to carry to cope with the many portages between lakes.
The plans contain sufficient information to make it possible to build the boat from scratch. They include full size drawings for all the forms.