I've built several fans that look like this, however to do so via milling from billet would be fairly expensive.  In the past theones I've built have always been a steel construction from cnc cut parts and then welded together.

Jarrett Johnson
www.innovention-tech.com

----- Original Message -----
From: Ernest Christley <echristley@nc.rr.com>
Date: Friday, May 20, 2011 6:48 pm
Subject: [FlyRotary] Re: Blower experiment:  FAIL

> On 05/20/2011 07:35 PM, H & J Johnson wrote:
> > As far as cnc'ing one, sure that can be arranged. Are we talking
> from billet or a casting or..?  Material?
>
> I'm thinking that the best I could do with the space constraints I
> have
> would look like the "Completely shrouded impeller of the D.V.L."
> pictured in the third page at:
>
> http://www.flightglobal.com/pdfarchive/view/1942/1942%20-%200144.html
>
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