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Ernest,
You are most probably right, but I'm trying to think how the pros might do it on paper, before committing to a physical design.
How might a Aeronautical Engineers tackle a problem like this - there are most probably some simple formulas, perhaps.
George ( down under)
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.
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