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Need to clarify. The day we tested this duct we also sealed
a radiator directly to the exit air plenum at several angles using foam board
and aluminum tape. We did this at several angles and measured the airspeed
through the core. With the NACA test we varied the angle of attack
for climb and cruise.
Bobby
I'm betting that this is probably true (angle not a big factor) since my
RV-8 installation has a duct angle to rad of about 90 degrees. It cools on
the ground at power levels high enough for level flight so I'm hopeful. As
usual, the duct is everything. The duct MUST be tailored to the angle and
that tailoring gets more difficult with increasing angles.
Tracy (resisting the urge to buy a Versys)
On Sun, Mar 9, 2008 at 11:44 AM, Bobby J. Hughes < bhughes@qnsi.net> wrote:
<<DSCF0462.JPG>>
Te
<<DSCF0460.JPG>> sting at NAWTF (North Austin Wind Tunnel
Facility):)
last year determined the radiator angle made almost no
difference with
this duct. Dennis H. and I measured the airspeed on the
backside of the
core at several angles. Do not have the data handy but we
observer about
a 1 mph difference across all the angles we tested.
What was
interesting was the airspeed deceleration in this crude NACA
duct. From
entrance to the non-existent lip the airspeed dropped by
1/3.
Bobby
(pics for your amusement)
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