Mailing List flyrotary@lancaironline.net Message #10682
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: today's rev-3 report
Date: Mon, 23 Aug 2004 08:10:44 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
Would like to add a comment if I may.  Forgive me if I missed it but I can't recall any mention of a bellmouth on the inlet to the throttle body.  Do you have one on your inlet?  A nicely designed bellmouth might could reduce inlet drag.

Carl Murakami (normally a lurker)
 
Thanks for the message Carl.  This is actually the easiest place to start, and might be just the ticket.  I know that my inlet system isn't the greatest, and the last time I went through this, I bought a couple of air horns for the TWM inlets.  Since I managed to match Tracy's B drive performance with the straight inlets, I never got around to trying the air horns.   
 
During the last test, I was getting 5500 static with the current inlet ducting, and 5750 with the TB open (no ducting).  I need to test this again, with the air horns in place, rather than just having the straight inlets in the TB.  If I could get another 100 rpm or so, I'd probably be in the ballpark of Tracy's C drive performance.  All I'd have to do then, is add an inlet ducting system that didn't reduce the flow any.  Yep, I think this might be the next test. 
 
Cheers,
Rusty
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