Paul wrote:
Hi all...here is the latest success story for my 13b powered SQ2000
canard. I removed the ram air scoop from the top cowling. I then
installed a NACA duct with a 3 inch hose outlet in the lower
cowling in the wing root area. I made an aluminum plenum with a 3
inch hose outlet to attach to the new NACA duct. Now, the incoming
air goes directly to the throttlebody and no longer pressurizes
the low pressure area of the cowling. Climbout water temps dropped
from the previous 205 (with the ram air scoop) to 180. I think if I
seal the plenum as Paul Lamar suggested, I can further
decrease my temps. It was 81 degrees outside, and the water temps
climbed to 180 during the climb. Settled down to 170 downwind. I
think I'm on the right track....will try sealing the plenum
next. Oil temps maxed out at 180, and dropped to 160 downwind. Not
as
low as I would like them to be, but going in the right direction.
Here are a couple pics of the NACA scoop and the intake
plenum. Paul Conner
You will get more power with a ram air scoop instead of the NACA. What
is current intake manifold pressure?
Paul Lamar
"Kent, Russell" wrote:
Paul,
It looks like you have a sharp right angle in the intake plenum,
namely the terminus of the NACA-style duct where it meets the
firewall. You'll get better dynamic pressure recovery across the face
of the cooler if that is radiused, even if it means you build up the
floor of the duct to accomplish it (counter-intuitive).
Russell Kent
Ops forgot Russell's sketch.
Paul Lamar
Matt Prather wrote:
My impression of what Paul's airplane has is different from what you have
drawn.
None the less, in keeping with the discussion from yesterday, I believe I
have drawn
(in orange) an even better shape.
Regards,
Matt-
Great minds work in similar manners Matt :) Either that or it is a law of physics.
Our sketches crossed in the mails.
Paul Lamar
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