I'm considering a ducted fan model (maybe using a Kress unit). Just one thing though...

...how do you start the engine when it is buried inside the plane?

Many Thanks,
=Adrian=

Use a starting probe with a rounded hex wrench at one end.
Reach the engine either through air intakes, or through a tiny whole located in the fuselage (reached thourgh the canopy).

http://www.avonds.com/Ramtec-probe.jpg