A while back I proposed using excess energy in the exhaust stream to
drive a turbine which would provide boundary layer control (suction)
for better takeoff and landing performance.  I still think this isn't
a bad idea as it might be quite a bit simpler than a turbo compound to
construct and implement.  I admit that it would be important to think
out what would happen if there were an engine failure while utilizing
such a system..

Similarly, I think it would be worth exploring what cruise drag
reduction might be afforded by applying active boundary layer control
for parts of the airframe that are difficult to streamline properly.
We were looking at a pusher design recently on here which had the prop
mounted too close to the widest part of the fuselage for airflow
without separation.  Active boundary layer control could improve the
ability of the air to stay attached as it follows the contours of the
fuselage.

The consequences of a turbo failure would be poorer cruise efficiency,
but nothing dangerous.


Regards,

Matt-

You can do the same thing by adding Fowler flaps, leading edge
slats and cutting down the wing area. Safer as they will not go
out if the engine dies. The best example is the Mitsubishi Mu-2.
http://en.wikipedia.org/wiki/File:Mitsubishi_Mu-2.jpg


The ultimate is VTOL. No wing area to speak of.
http://www.rotaryeng.net/VTOL.html Least safe :)

Paul Lamar
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