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02-27-2016, 04:46 PM
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Join Date: Jul 2008
Location: Houston, TX
Posts: 456
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Check out the Cirrus SR22 G3.
In this generation, they moved the intake from the wings (G2) to a NACA duct on the right side cowl.
Also note how they treat their emergency procedure for cabin smoke or engine fire.
Seems like a good way to get fresh air.
They have a heat mixer to provide warm/cold/mixed air to both the front and back vents.
I would do it this way on my -10 but I can't figure a route over the spar to get to the back seats (other than through an overhead or through the center tunnel, both not ideal)
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Michael Delpier
RV6A -O-320, fixed pitch, GRT Sport, 496
RV-10 - working on finish kit
Houston
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02-28-2016, 06:34 AM
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Join Date: May 2011
Location: Atlanta, GA
Posts: 239
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Cooling issue...not you, the engine
I went with NACA scoops on the side of the fuselage for two reasons. The first is that they provide a huge amount of air. You will even get flow from the prop at idle on the ground. No CO problem as the air is truly fresh.
My concern with your setup is that you are robbing cooling air from the engine when you most need it, summer. Both you and the engine need cool air. If you don't get it, you get sweaty. If the engine doesn't get it, you get sweaty replacing cylinders. You might be able to get away with this in winter but you won't need the cold air in the cockpit then. Food for thought.
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RV4
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02-28-2016, 06:56 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Quote:
Originally Posted by rvbuilder2002
 You're right Mel, I had just finished reading the OP's post, (who had also written Co2) and had that stuck in my mind.
Why didn't he get scolded? 
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Because I missed HIS entry error. Guess I just pay more attention to your posts. Sorry.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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02-28-2016, 07:05 AM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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To the original poster - You want to do something to protect your engine mount from that braided oil hose.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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02-28-2016, 07:07 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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I'll take my fresh air from NACA ducts.
There is a temperature rise between the cowl inlets and a baffle wall duct. Some of it is ram rise (there's another thread on that subject right now, as it relates to OAT probes), and some of it is heating from the upper cylinder fins.
I've measured the temperature increase repeatedly, comparing OAT to a temperature probe inserted in the plenum feeding a remote oil cooler from the rear baffle wall...essentially the same thing as feeding the cabin. Two examples from my notes, morning and afternoon business trip, out and back:
Hot day testing (107F on the ground at Jackson MS)
Morning OAT 64F @ 8500 ft
Oil cooler inlet probe 81F
81-64= 17 degree rise
Afternoon OAT 86F @ 2500 ft
Oil cooler inlet probe 101F
101-86= 16 degree rise
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Dan Horton
RV-8 SS
Barrett IO-390
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02-28-2016, 08:03 AM
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Join Date: Nov 2013
Location: Auburn, NY
Posts: 46
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YES !! Going to take the NACA scoop direction.. Mount the scoop on the lower cowl.. Brain did not connect with that option… There is plenty of room to easily connect / disconnect the scat from the scoop when the lower cowl needs removal… Really don’t see any down side. No CO issues.. Sounds like top notch flow when desired… Courtesy photos of installation to follow in a few days.. Many thanks… Al
Last edited by laserman : 02-28-2016 at 08:08 AM.
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02-28-2016, 08:07 AM
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Join Date: Nov 2013
Location: Auburn, NY
Posts: 46
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Thanks. Fixed the braided oil line issue. and will keep it in mind with other braided lines as well Al
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