I've gotten an email regarding some feedback from the Kent festival this year and it mentions the D2 boats.
The Kent festival was quite fun. It was bigger than last year, due to
the Pacific Dragon Boat Association championships being held here this
year. There were just under 50 teams. I occasionally take for granted the "small, low-key one-day festival." Then after racing in seven races, after exhaustion starts to take hold, I remember once again how hard one-day events can be.
Our club entered a mixed team in the PDBA Championships and eventually took third. Zamboanga out of Portland took gold, and Wasabi out of Portland took the silver.
The race officials used four boats per race, though occasionally only
three raced. The boats were a combination of BUK boats (supplied by Tacoma Dragon Boat Assoc.) and hybrid "D2" boats (designed & built by Mac Gordon).
The latter looked like a 6-16 with the center beam removed, and installed
under the middle of the floor. One-piece BUK style seats had been installed. The fit and finish was a little rough, but they seemed to race pretty well. I thought they would flex more than they did.
My guess it that the D2 boats, on the most basic level, can be described as a 6-16 minus the center beam.