My question for Jeff is "what are the noise effects of stators behind
the prop?" I'm installing my old duct1 stators now in duct2, have never
flown with stators yet. Of course these have to be on radials, but I'm
not sure what distance to place them behind the prop either. I'm making
the whole 7-blade assembly removable so I can relocate it.
--
Perry J. Mick
Mick Duckt N7XR
http://www.ductedfan.com
"Sneed, Glen" wrote:
Perry,
The stators can really increase the thrust on most traditional ducted
configurations without a increase in power, just like the compound turbo
charger.(for us Paul)
If you are interested in a departure from conventional impeller design,
check out the JetFan website from down under. http://www.jetfan.com/
This design offer the potential of a 20-25% increase in static pressure over
traditional impeller designs.
My son and I were going to experiment with it for model a/c jets. He lost
interest in model building and has set his sights the real thing. I am
still considering it as a future project but I need to get my airplane built
first.
Glenn Sneed
I tried that web site Glenn and I was unable to access it.
I guess what you mean by "traditional impeller designs." is a ducted
fan without stators. I am sure P&W, GE and RR have tried all
configurations. I am also sure Jetfan is not implying a 20-25% increase
over the typical airliner ducted fan. In the case of a turbo compound
waste heat energy is being recovered. In the case of a ducted fan there
is no waste heat energy (yes I know. it is all heat. don't write) but
there could be waste energy in the vortex emanating from behind a
ducted fan or prop for that matter. To recover this would not be free.
There is the aero drag from the stator. It could however show improved
thrust and I wait with bated breath to find out how much when Perry
modifies his duct with stators and flies it.
Paul Lamar
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