The Duffek is a kayak stroke only? If Tom Foster heard that he would be laughing his butt off.
Yes, Milo Duffek was the originator of the stroke and paddled kayak. But Duffek (on-side and cross) have been used by open boaters for decades. I suspect that what I and many others call the Duffek and cross-Duffek strokes are what you call static bow draws and cross draws (or “hanging” draws and cross-draws), and sometimes the terminology is used interchangeably. In my teaching the Duffek strokes utilize a more vertical paddle shaft angle than the old fashioned static bow draws and cross draws which were sometimes taught with a very acute shaft angle, more akin to a bow rudder. And the term “Duffek” has been applied to these more upright canoe strokes for decades.
In the American Canoe Association “Canoeing and Kayaking Instruction Manual” edited by Laurie Guillion copyright 1987, the Duffek and cross-Duffek are on the list of strokes for both solo canoe and bow tandem canoe (pp. 37-38). Duffeks and cross Duffeks have been taught in every open boat clinic and course that I have participated in as a student and have been taught to me by people like Tom Foster, Ron Lugbill, Gordon Black, and Nolan Whitesell. The Duffek and cross-Duffek are part of the curriculum for the ACA course Level 3: River Canoeing:
and Level 4: Whitewater Canoeing:
And for those who might be unfamiliar with it, here are a few videos demonstrating that stroke that “no one uses”: