Somebody mentioned the March 2006 issue of Sport Aviation article on engine
cooling, which states that NACA ducts don't work so great in reverse. This is
what I have on my plane, and I don't know about cooling, but I can tell you
that pointing your exhaust pipes at the narrowing duct doesn't wo
Mark:
By NACA ducts do you mean "scavenger" exhaust systems where the open exhaust
pipe is in the narrow throat of a venturi like exhaust stack to aid in reducing
exhaust back pressure and cool the exhaust?
Don
Mark Lan
At 10:25 PM 5/8/2006, you wrote:
>Mark:
>By NACA ducts do you mean "scavenger" exhaust systems
>where the open exhaust pipe is in the narrow throat of a venturi
>like exhaust stack to aid in reducing exhaust back pressure and
>cool the exhaust?
>Don
> -
I should have paid attention before. Understanding the NACA duct
design clearly calls for the pipe to enter at the narrow end and the
exhaust to exit at the wide end.
At 05:04 AM 5/9/2006, you wrote:
>At 10:25 PM 5/8/2006, you wrote:
> >Mark:
> >By NACA ducts do you mean "scavenger" exhaust syst
At 09:45 AM 5/9/2006, you wrote:
>I should have paid attention before. Understanding the NACA duct
>design clearly calls for the pipe to enter at the narrow end and the
>exhaust to exit at the wide end.
>Larry Severson
++
As I recall, and you can rea
>As I recall, and you can read Mark's site for clarification, Mark's
>plan was to take the low velocity cooling air and re-accelerate
>it to merge with the slipstream air for less drag. Hence the
>reversed NACA duct.
Understood, but I have the additional advantage of having an engine
with too
Now that I think I understand what I thought I was supposed to sometimes
know... What is the concensus for getting exhaust out the back of one of
Diehls really tight cowls? I sectioned the sides of it so only the little
rounded part hangs below the firewall. Fabricated an oil tank, so I could
have
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