Mailing List flyrotary@lancaironline.net Message #33893
From: Al Gietzen <ALVentures@cox.net>
Subject: RE: [FlyRotary] Re: Exhaust Update
Date: Mon, 9 Oct 2006 15:17:19 -0700
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>

 

Which photos?  There were 5 or so pics attached to the first message. Did

you get those?  What else you want pics of - I'm headed up there today or

tomorrow??

 

Joe

 

Joe;

There was something peculiar about your first message – delivery here was delayed by several hours.  Maybe Buly will eventually get it also.  Probably the hyperspace police had to analyze it first.

 

Some photos of the support and heat shielding would be very interesting.  Also, what material(s) are used.

 

You also said: Obviously the Tangential muffler sucks (actually blows) when it comes to performance! WAY too much back pressure.

 

I’m thinking this may be too much of a generalization.  The performance of my 20B measured on the dyno (quite good) was with a tangential muffler; although with some differences.  I added internal angled vanes opposite the headers to avoid something called “swirl flow choking” which I though might be a possibility.  Maybe I was right.  Also, the exit end on mine is conical with some internal vanes to straighten the flow and reduce the pressure drop due to the sudden contraction.

 

Perhaps with these differences the tangential muffler doesn’t suck – but just blows.

 

Al

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