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Looks like K&W to me. A much closer representation than my very truncated ducts - so should cool even better.
I believe your measured results reflects the known fact that you can not ( in practice) get the theoretical "even" distribution of pressure across your core. There is always going better pressure recovery in the center where the air velocity normally stays the highest. But, the Streamline duct gets you about as close as a practical approach can and I again think that is reflected in your reading of 0.33 across most of the core.
Good work, Ernest! Looking forward to the results.
Me - decided to ditch my door design when I found out the cost of shipping the metal material would cost as much as the material itself. So am now doing it in wood that is available at the local stores and it appears that may actually work out to be less work {:>) not to mention costing less. Iteration 24 }:<(
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, June 27, 2006 9:37 PM
Subject: [FlyRotary] Time marches on...parts get made
There hasn't been many building reports lately. I think everyone is
flying except me. Anyway, here is some progress I'm making.
The oil cooler inlet duct is made as close to what K&W prescribes as I
could get it. I tested it today with a borrowed static pressure air
meter and a leaf blower. I couldn't get a steady reading simply holding
the probe out in front of the cooler, so I drilled a hole in a spray can
cap and poked the probe through it. This captured the static pressure
from a representative area and kept the probe tip at a given distance.
The very tip of the cooler measured around 0.39inH20 and the end closest
to the tight curve was only 0.25 or so. But that was only for an inch
or two. The center read a fairly steady 0.33 across the length, varying
±.02. I think I'm going to put this one in the plane.
The water cooler is next. The white tower is the mold I've been making
for the inlet duct. I laid out the K&W coordinates, and cut them out of
doorskin plywood. Then I slotted them to slip together. Hot glued a
cap on each end then filled the interior with foam. Now I'm covering it
with lightweight spackling to set the final dimensions. I should be
ready to do the lay up as soon as it cools off.
The final picture is the radiator I'll be using. 12.5x8.5x4.25. A cap
will cover the factory inlets, and I'll have to mount nipples on both
sides. There was a baffle on the inlet side that I had to drill
through, but other than that this should be an excellent radiator for
the Delta. The flow was down the front right, up the back right, over
and then down the left back, then up the left front. After drilling the
baffle and adding my own connectors, the flow will be down the front and
up the back. I was able to slide a piece of clothes hanger that measure
.090 into the passage through the hole I drilled. There are 23 sections
with 5 passages in each, for a total area of at least 0.73in2. My plan
is for 3/4" hose, which only has an area of .44in2 at best. Flow
through the radiator should not be an issue. An important point for an
EWP installation.
-- This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."
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