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05-04-2017, 07:47 PM
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Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,196
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Actually, Geoff's controller is more beneficial in the winter. Without it, the overhead console is pressurized and every switch, valve, light, etc will leak air. With the controller, it greatly reduces the air pressure when closed. This makes for a much warmer cabin in the winter.
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05-05-2017, 05:20 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Non-issue.....
Quote:
Originally Posted by rleffler
Actually, Geoff's controller is more beneficial in the winter. Without it, the overhead console is pressurized and every switch, valve, light, etc will leak air. With the controller, it greatly reduces the air pressure when closed. This makes for a much warmer cabin in the winter.
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My air is ducted to the eyeball vents and not just dumped into the entire overhead console so I don't have air leaking out of every gap/seam/hole. This is where having quality vents, like the ones from Stein, pays off.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
Last edited by Auburntsts : 05-05-2017 at 05:31 AM.
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05-05-2017, 05:43 AM
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Join Date: Aug 2012
Location: Albany Western Australia
Posts: 54
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Cabin Ventilation
I've only put one Naca Vent in to feed the four vents in home grown overhead console. More than enough airflow even when taxiing on the ground. Mine is the standard Vans Naca positioned just behind and just above the baggage door. Made the decision to put only one in, and only on the Port Side after discussion with Lancair owner who had put one Naca Vent on the Starboard Side which was completely useless, with virtually no airflow to his overhead. Got to have a lot do do with the Prop Wash Airflow spiralling around the plane, makes you think that the extra Vent some folk put in are only for decoration and not providing any useful function. Cheers from Western Australia
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05-05-2017, 08:25 AM
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Join Date: Jul 2008
Location: Prosper, TX
Posts: 373
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NACA vent
I also put in only one vent and experience plenty of airflow to the overhead console. I put mine on the starboard side as I was concerned about the prop wash picking up exhaust on the port side, but it appears that may not be an issue from other's experience. Even with one vent, I still decided to put in a valve to control the airflow velocity at cruise, much more comfortable now.
__________________
RV-10 N415JS
Slow build kit #40874
Homebuilt Kit Champion Oshkosh 2019
Atlantic crossings: 2
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05-05-2017, 10:16 AM
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Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,530
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Scratching my head on this one.
For sure.
Planning on making my own overhead for ventilation, lights, GPS antenna mounting purposes. LeoK is sending me his finished female mold for this purpose. Planning a forced-air-over-icepack "air conditioner" for ground ops on hot sunny days at the beach, etc. Otherwise no A/C and no need anticipated.
Sounds like one NACA (on either side) will suffice for airflow. Questions remain about the need for the buttterfly valve in line. Seems to me that pressurizing the overhead is simpler than running SCAT to each vent. Automobile vents are far cheaper than the machined aluminum eyeball vents, seal more poorly,and probably mandate a butterfly valve for full control, partially offsetting cost. But they come in a much wider array of styles.
I come away from this thought exercise wishing Geoff offered his butterfly servo controller in a single barrel design. I could use one for the NACA outside air vent and another for the icebox AC unit. (Actually, I could use a blend-door setup like cars use for heat-cool mixing, but not sure how to practically achieve that with COTS parts.) Anybody know if the AeroSport unit can be re-clocked as a differential mixing valve, where one barrel opens proportionally as the other one closes?
__________________
Bill Boyd
Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction
donating monthly to the VAF - thanks, Doug
Last edited by Bill Boyd : 05-05-2017 at 10:18 AM.
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05-05-2017, 10:34 AM
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Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,196
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Quote:
Originally Posted by Bill Boyd
For sure.
Planning on making my own overhead for ventilation, lights, GPS antenna mounting purposes. LeoK is sending me his finished female mold for this purpose. Planning a forced-air-over-icepack "air conditioner" for ground ops on hot sunny days at the beach, etc. Otherwise no A/C and no need anticipated.
Sounds like one NACA (on either side) will suffice for airflow. Questions remain about the need for the buttterfly valve in line. Seems to me that pressurizing the overhead is simpler than running SCAT to each vent. Automobile vents are far cheaper than the machined aluminum eyeball vents, seal more poorly,and probably mandate a butterfly valve for full control, partially offsetting cost. But they come in a much wider array of styles.
I come away from this thought exercise wishing Geoff offered his butterfly servo controller in a single barrel design. I could use one for the NACA outside air vent and another for the icebox AC unit. (Actually, I could use a blend-door setup like cars use for heat-cool mixing, but not sure how to practically achieve that with COTS parts.) Anybody know if the AeroSport unit can be re-clocked as a differential mixing valve, where one barrel opens proportionally as the other one closes?
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The barrels are separate. I wouldn't think it would be difficult to rig what you want. I suspect all you have to do is reposition one of the levers.
Although I'm not sure how you would rig an ice box cooler since the valve is behind the baggage bulkhead.
Give Geoff a call a discuss your idea.
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05-05-2017, 12:26 PM
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Join Date: Jul 2008
Location: Prosper, TX
Posts: 373
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Butterfly Valve
Another reason I chose to install a butterfly valve in my setup is that without the valve and with all 4 Steinair vents closed, I found that the entire overhead console would exhibit visible buffeting from the pressurization available from the NACA duct at cruise speeds. The buffet ceased with a vent opened. After installing the valve, the buffeting is no longer an issue with the vents closed, and the passengers appreciate the ability to throttle the vent air velocity at any airspeed from taxi to cruise. I built my own valve without too much difficulty. For A/C, I have one of the cool box units and thought about plumbing it onto the overhead, but then I started flying and, well you know the rest... maybe at the next condition inspection...
__________________
RV-10 N415JS
Slow build kit #40874
Homebuilt Kit Champion Oshkosh 2019
Atlantic crossings: 2
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05-08-2017, 01:19 AM
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Join Date: Jul 2015
Location: inverell, australia
Posts: 3
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So I ordered 2 additional rear vents and fitted them on either side just above the height of the rudder pedals . I have a push pull rod attached for activation. I have instant air flow once the prop turns. No annoying squelch break-through from the NACA ducts. Cooling to the instrument panel as well. Abundant air flow , way better than the NACA's in my opinion.
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05-08-2017, 06:11 AM
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Join Date: Jan 2013
Location: Southampton, Ont
Posts: 87
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NACA Vents/Overhead Console
Jack in Michigan, I have 2 NACA vents, no butterfly valve and do find a bit of a draft that comes from the OH console access hatch on cold days (similar temps to you). Bear in mind I have a home made console so my engineering may not be up to Aerosports standard. In my case one vent would likely have been enough. A gasket around the hatch has helped but I will likely add a butterfly valve at some point.
Rick
#40956
Southampton, Ont
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05-08-2017, 06:32 AM
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Join Date: Aug 2007
Location: Zuerich, Switzerland
Posts: 147
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Quote:
Originally Posted by David Paule
That outgoing cabin air has two ways to leave. It'll either escape through various gaps and holes, creating drag, or you'll install a cabin-air exit in a relatively low-pressure area on the fuselage.
I've asked about cabin air exits on VAF a couple times with zero response.
As far as I know, the only general aviation production plane with them is the Beechcraft Bonanza. It's located about halfway back from the wing, on the tailcone.
Dave
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David,
Actually behind the doors where the passenger air vents are located might be a low pressure area. I witnessed that when going fast ~180 kts my rear air vent was sucked open.
Mike
__________________
RV-10 builder (flying)
#40511
Switzerland
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