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Date: Mon, 25 Jan 2010 18:03:41 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Wedge/Oblique Duct
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George Lendich wrote:
>  Ed,
> I have been thinking about this, if I use A1V1=A2V2 to solve for the 
> inlet opening size, how do I know if the speed of air through the duct 
> is correct i.e. 10% for cruise and 30% for climb.
>  
> Also If I use the Cessna 171 speed of approx 100 K for cruise = 10 K 
> through core, 70 knot climb and approx 20 K through core. Do I then 
> use the climb speed to calculate inlet air openings and attach an 
> adjustable louver exit OR I suppose I could do as Tracy does and 
> calculate for cruise and attach a spray bar.
>  
> I'm still a little confused on the best approach.
> George ( down under)
George, maybe the problem is that there isn't a "best approach".  
There's "not worth a cuss";  and there's "good enough".  There might 
even be a "works pretty dang good".  Everybody wants bragging rights to 
having landed the perfect solution on first flight, with the difference 
between perfect and "get it in the air" being a few fpm in climb and a 
handful of kts at cruise.