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From: Hans Conser <hansconser@gmail.com>
Subject: Re: [FlyRotary] Re: Exhaust Blowout
Date: Mon, 27 Feb 2006 11:59:39 -0700
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>


On Feb 27, 2006, at 11:04 AM, Perry Mick wrote:

> Joe, I would recommend using the stock exhaust manifold. At least 
> during
> your early flight testing. That is all I've ever used and it is 
> bulletproof.
> I just passed 560 hours TT. Experiment with mufflers later. I'm happy 
> to
> just continue using the stock manifold because it is worry-free. Broken
> exhaust systems aren't good on pushers!

Reading this thread makes me think about the stock and aftermarket 
manifolds for the RX-7.  One thing that the factory and reputable 
aftermarket have in common is that they are all built very heavy.  My 
Racing Beat Headers on my NA car must be 1/4 or 3/8 of an inch thick,  
The stock turbo manifolds are very very thick cast iron, and guess 
what?  They still develop cracks.   Some of this is poor design of 
course, but I think on a pusher a point zero whatever thickness on 
anything in the exhaust sounds really fragile to me.

Hans