Bicycle rowing, Derk Thijs,
When looking at rowing bicycles one designer seems to have really solved the problem, Derk Thijs.
The story of Derk's rowing bicycles is pretty long and started with his visually best bike. These vertical "oars" are a pleasing sight.
Below you see the evolution, most photographs are from his own history page.
Derk has rowed some extraordinay distances (paris- rotterdam) with his bikes and also had some incredible records (45,1 km in one hour), Alpe d'Huez, tour de France one day in advance of teh peloton, built streamlines etc.
If you wonder what the performance is in moutains have a look at this youtube movie.