Jolyon Sandercock wrote:

hello Paul, thanks for getting back to me so quickly. Basically, I've been scouring the web for information on a static (fixed) ducted fan capable of producing an exhaust velocity in three ranges, approx 100 kts, 130 kts and 170kts. The emphasis will be on low noise and long component life... does this sound like anything you have encoutered to date?

Our man Perry Mick has been flying with rotary engine powered ducted fans 
for quite awhile. Please check out his web site address on the ACRE NL website.
So far it has been difficult to equal the performance of a simple prop
in those speed ranges. If you don't mind the performance hit they do work.

Paul Lamar
 
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