Hi aircushion,
the twin ducted fan amphibian was designed here. It is currently on hold but near completion. You can see more details at http://www.tiswildeair.com or e-mail me off line.
regards motorglider
The slipstream issue with tractor vs pusher configuration is less of an issue with low power flight such as motor gliders and self launching gliders. However in these craft the best of both worlds is obtained by an engine mounted above the fuselage on a pylon. This has obvious advantages for...
A further very usefull reference fot those interested in designing ducted fans or shrouded propulsors is
'Aerodynamics of VSTOL flight', MxCormick,B.W. Academick press. Library of congress no 66-30093 chapter 9
A low pressure ducted fan, usually called a shrouded propulsor, can be designed...
