Mailing List flyrotary@lancaironline.net Message #38720
From: Russell Duffy <rusty@radrotary.com>
Subject: Exhaust scavenging effect?
Date: Wed, 25 Jul 2007 10:30:32 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
Greetings,
 
With all the talk of single rotor power levels, everyone seems to be assuming that we'll get half of what a 2 rotor gets for HP.   One thing that we lose with the single rotor is the scavenging effect that can be gained from the exhaust flow of the other rotor.  How much of a HP loss is this? 
 
My guess is that it won't be much of a factor, but that's only a guess.  My assumption is that there isn't a huge difference in power between having two separate exhaust paths (Ed) vs having a perfect converging exhaust on a two rotor.  Seeing as most of us never had a perfect converging system, the diff will be even less.  Is it significant enough to think about for our purposes, where packaging is almost more important than outright performance? 
 
Cheers,
Rusty
 
 
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