Mailing List flyrotary@lancaironline.net Message #23267
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Two Engines In One?
Date: Tue, 7 Jun 2005 11:18:32 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message

Would it be possible to treat a 13B as 2 singles that happened to share a common side housing? What I'm wondering is, can you use 2 carburetors, 2 fuel pumps, 2 ignition systems & CAS's on a single 13B
- each rotor independently serviced - and still have reasonable performance (i.e. HP)? You would still have a common oil and water cooling system - but hey that eliminates the EFI, ECU, and potentially your electrical system as single points of engine failure.

 
Hi Joe,
 
You could certainly do that, but a two rotor engine running on one rotor is supposed to be so rough that you might shut it down just to keep from having to put up with it.  I have to admit that I don't completely understand why that is, and I'd appreciate it if someone would explain that to me.   
 
The next thing to consider is that you'll be making a bit less than half power at best with a constant speed prop.  With a fixed pitch, you will be way over propped, and probably won't be able to get the engine into a decent power range, so you won't be able to maintain altitude in most planes.  My RV-3 might do OK, but a fully loaded RV-6 won't.
 
Good thought.  Full credit for outside the box thinking :-)
 
Cheers,
Rusty
  
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