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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