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To: flyrotary@lancaironline.net
From: Christopher Owens <rotary@cmowens.com>
Subject: Exhaust system choices
Date: Thu, 4 Dec 2008 09:17:35 -0600

Hi all,

Been lurking in this group for a while and thought it might be time  
for a question of my own.

I've read through Tracy's exhaust adventures on his web site, in his  
conversion guide, and in his Mazda Papers, and note that he's tried  
just about every imaginable combination that would fit in his  
aircraft.  It seems that the underbody mounted solution is the one  
that's seen the most use.  And it probably works best given the  
limited space inside the cowl of his aircraft.

But what if one is building an aircraft that has more space inside  
the engine compartment?  My friend and I will begin construction of a  
pair of Barrows Bearhawk aircraft in pretty short order, and rotary  
engines are likely in their future.  There's a fair amount of space  
inside the cowling of this aircraft after the engine goes in, the  
best that I can tell.  If space permits, is the tangential muffler  
the better option for this installation?  I've also considered seeing  
if I could use the Racing Beat header and snake some curved tubing  
around to meet some exhaust components inside the engine compartment  
as well, but don't know if this is an effective solution too many  
turns in the system for clean exhaust output.  I'm still doing much  
research in this regard.

Elden Yates just finished his rotary Bearhawk and is flying off  
hours, as I understand it, but I haven't seen many photos of his  
engine installation to see what fits and what doesn't.  Perhaps I'll  
be lucky enough to see it at Oshkosh one day.

Thanks and best regards,
Chris (digging through the archives for hints)