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Date: Fri, 20 May 2005 14:09:53 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Intermediate housing ports/porting
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Russell Duffy wrote:

> Imagine one rotor having it's intake cycle.  The port opens, there's 
> a large rapid surge of suction pulling air into the rotor housing, but 
> as it nears the end of the cycle, that suction subsides and the air is 
> just more or less coasting in as the port starts to close.  Now, 
> imagine the second rotor starting it's large suction portion of 
> it's cycle as the first rotor is coasting.  The second rotor will be 
> perfectly happy to suck some of the air and fuel out of the first 
> rotor, as it also sucks new air in from the runners.  


> Cheers,
> Rusty (too many experiments)   


But that would happen only if the pressure coming from the throttle were 
less that the pressure at the rotor.  How could the pressure at the 
rotor be less if it has been *sucking* in air? 

The point behind tuned tubes of about 15" to 20" is to provide for 
velocity in the air so that the cylinder continues to be packed once it 
starts closing.  So with a properly tuned intake, there must be a 
pressure in the tube that is higher than the combustion chamber.

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