REFLECTOR: Cooling the engine
Brett Ferrell
reflector at velocityxl.com
Wed Mar 28 08:38:39 CDT 2012
There is a very good article by Marc Borom, which has moved around. Here
is the current link
[LINK: http://marc-borom.com/LongEZ/NACA_AirFlow.htm]
http://marc-borom.com/LongEZ/NACA_AirFlow.htm
I'm going to capture it on the Wiki as well in case it moves again....
[LINK: http://www.velocityxl.com/wiki/index.php?title=NACA_Ducts]
http://www.velocityxl.com/wiki/index.php?title=NACA_Ducts
Brett
-------Original Message-------
From: Kevin Baker
To: Ron N Velocity XLFG , Velocity Aircraft Owners and Builders list
Cc: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Cooling the engine
Sent: 28 Mar '12 07:56
[LINK: http://forum.canardaviation.com/archive/index.php?t-7.html]
http://forum.canardaviation.com/archive/index.php?t-7.html
This is part of the email I had recieved.
Thanks
Kevin Baker
.
On Mar 28, 2012, at 7:19 AM, "Ron N Velocity XLFG" <[LINK:
mailto:VelocityXL at fastmail.fm] VelocityXL at fastmail.fm> wrote:
Did not try side dams .Will give it a try though .
----- Original Message -----
FROM: [LINK: mailto:flykb at verizon.net] Kevin Baker
TO: [LINK: mailto:reflector at tvbf.org] Velocity Aircraft Owners and Builders
list
CC: [LINK: mailto:reflector at tvbf.org] reflector at tvbf.org
SENT: Tuesday, March 27, 2012 11:51 AM
SUBJECT: Re: REFLECTOR: Cooling the engine
Hi Scott
Did you try to add the "side dams" to catch the spillage.
I saw a note somewhere that those helped but don't remember where I saw
it.
Kevin Baker
.
On Mar 27, 2012, at 10:26, Scott Derrick <[LINK: mailto:scott at tnstaafl.net]
scott at tnstaafl.net> wrote:
I posted this with attached photos and then realized the total was
probably way over the list attachment size limit.
So I put all the referenced photos in this file [LINK:
http://tnstaafl.net/canards/cooling.zip]
http://tnstaafl.net/canards/cooling.zip
I also found the testing photos of the spillage of air out of the top
NACA's
[LINK: http://tnstaafl.net/canards/right_naca_rear.jpg]
http://tnstaafl.net/canards/right_naca_rear.jpg
[LINK: http://tnstaafl.net/canards/left_naca_rear.jpg]
http://tnstaafl.net/canards/left_naca_rear.jpg
Scott
Ron,
I feel your pain. Been that and Done there.
I don.t think you'll get any joy from changing the 2-into-1 exhaust.
Things I did to get from barely around the pattern before exceeding
redline CHT limits to comfortable cruise at 330-380- CHT temps in the
summer.
1.) Extremely anal about tight plenum and cylinder baffles. no unplanned
holes larger than a pencil. Be sure all you cylinder baffles are in
place.
2.) Large(half to 3/4 inch high) VG's apx. 6 inches in front of your
upper NACA inlets.(vg.jpg)
3.) Diverters around the exhaust exits, Air was entering the lower
cowling, specially at high angles of attack, increasing the lower cowl
pressure which reduced the flow through the cylinders. .(picture
attached) exhaust1 is looking back at it, exhaust2 from the side, left
is front.
4.) extended the NACA lip, (nacatest.jpg is testing the spillage and
shape of the eventual extender, extend.jpg is the extender installed)
5.) lower cowl flap. (lowerside is a side view cowling removed. cowlrear
is looking dow the business end of the cowl flap)
Scott
--
Forget injuries, never forget kindnesses.
Confucius
Ron Velocity XLFG wrote:
Well I have to high engine temps and I am working on reducing them.
Exhaust wrap I have read that they are good at keeps the heat out of
the cowling
Bad may cause a crack in the pipes any one tried this
method
with success of failure?
I have a two in to one exhaust that goes next to the oil pan .
First I was going to wrap the exhaust pipes but now I may consider
making two straight pipes out of the engine instead of the two in to
one.
My hope would be cooler engine. any thoughts. I did the two in to one
with the idea of reducing engine noise but if it is adding heat it must
go.
Tried a few mods to the nacas. None helped most made it worse for
cooling. I had fans to help in cooling on the ground I removed them
and it helped in the air but now I must get in the air a little more
quickly now.
I was going to add a cowling flap I have heard this would help any
thoughts?
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