DLR Smartfish

Smartfish is a proposed two seat experimental aircraft design by Konrad Schafroth which uses a lifting body configuration.
There are a few working model examples of the Smartfish. A fuel cell-powered model has been built in collaboration with German Aerospace Center (DLR) and, according to the factory, flew in April 2007.
Unlike most aircraft designs, the Smartfish is modeled after the Tuna species of fish. This makes the plane fly steadily without error-prone slats, spoilers or flaps. The projected range of the aircraft is 8000 km at about Mach 0.9. 
A proposal for a hybrid airship based on the Smartfish's geometry has also been published.