George Lendich wrote:

Jeff,
Thanks for your comment - what sort of HP is your "Moller" engines
developing!?
and are the powers that be satisfied with the efficiency of the ducted
fan, I know of one chap who is struggeling with the technology
(his own pusher) and he doesn't seem to be getting better than prop
efficiency - is this normal !?

Your man is doing better than most who have tried it.
Our man Perry Mick included. Check out Perry's web site.
The link is on the ACRE NL web site. PL
http://home.earthlink.net/~rotaryeng/

All in all a very pleasant looking aeroplane
George (down under)

Just to clarify, I haven't worked for Moller for about 6 years.  The use of
the ducted fan on the Moller machine is the classic case of more static
thrust with a rotor diameter restriction.  No ducted fan will never be as
efficient as a properly designed prop/rotor for low subsonic speeds.  The
fans at Moller were mostly designd for static thrust and 80%+ efficiencies
were attainable.  But, keep in mind that's 80% of what a perfect duct would
do, not 80% of the horsepower of the engine converted to equivalent thrust.

Jeff Spitzer

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