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Date: Fri, 20 May 2011 20:30:18 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Blower experiment:  FAIL
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On 05/20/2011 07:27 PM, Ed Anderson wrote:
> Mike, general centrifugal impeller such as used in turbocharger and 
> some superchargers are rev up to much higher rpm than the engine 
> operates at. Ernest concept involved using the engine rpm (direct 
> drive so to speak) which is much lower than the rpm these centrifugal 
> impellers require (for any useful pressure increase).  So slower rpm 
> generally means larger impellers than commonly found in turbo or 
> superchargers.  If not constrained to the engine rpm then yes, your 
> suggestion would have merit - on the other hand,  there may be 
> impeller off superchargers of those big multirow radial engines of 
> WWII that would be large enough - probably hard to find and heavy.
Not so hard to find:
http://cgi.ebay.com/PRATT-WHITNEY-RADIAL-ENGINE-IMPELLER-/320701148172?pt=LH_DefaultDomain_0&hash=item4aab472c0c

http://cgi.ebay.com/PRATT-WHITNEY-RADIAL-ENGINE-IMPELLER-/320701149501?pt=LH_DefaultDomain_0&hash=item4aab47313d

and I also found this:

http://cgi.ebay.com/TROY-BILT-TB4BP-BACKPACK-BLOWER-IMPELLER-FAN-753-05657-/270718363966?_trksid=p3286.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D3%26po%3DLVI%26ps%3D63%26clkid%3D71785288103015489

The problem is with cutting the most of the center out.  Then it is just 
cantilevered blades stick up.