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  #11  
Old 06-04-2017, 08:49 AM
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1001001 1001001 is offline
 
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Default

Quote:
Originally Posted by rleffler View Post
I don't think Geoff has indicated that the valve was 100% effective. Just like the similar valves used in hvac, it cuts off most of the airflow. It's really a necessity if you pressurize the overhead plenum. You would be surprised how much air will leak through switches and some types of lighting.

I fly when it's below zero, so I want to ensure the entire solution can prevent any cold air blowing into the cabin.
I wouldn't necessarily expect it to be 100% effective at closing off flow entirely. Its purpose is to control flow, not necessarily serve as a shutoff valve. In industrial situations it is common to have an isolation valve ahead of the control valve to ensure proper shutoff.

It might be possible to modify the valve as I described above to get a better seal and possibly achieve better shutoff characteristics.
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  #12  
Old 06-04-2017, 09:43 AM
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Bill Boyd Bill Boyd is offline
 
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Default did something similar years ago

to the cheapie plastic eyeball vents from Vans. RTV with release agent to serve the same function as the felt gasket you describe. Works pretty well until it starts peeling away and flapping in the airstream

I'm betting the AeroSport butterfly could be "tightened" a bit as you describe.
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Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
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  #13  
Old 06-04-2017, 07:35 PM
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Aerosport1 Aerosport1 is offline
 
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The Aerosport NACA control valve will shut off the airflow Over 90%. This valve was designed to control the flow of air in the winter and keep the overhead console from filling up with cold air the valve also helps control the flow of air and reduce the air to a more pleasant flow rather Than a hard high speed flow. Today I was out doing approaches and it was around 88f and I had the vents wide open and the valve adjusted so I had a real nice HVLP flow coming in from the overhead vents. Very comfortable. You can have the vents wide open and control the air flow from the valve. Having both a quality vent and the valve makes the overhead console work very nice. I have no noticeable leakage around the overhead anywhere in the winter when the valve and vents are closed. There is a very very little flow when the valve is closed and the aircraft is at cruise speed but when the vents are closed it is a non-issue. With the Aerosport AeroVents installed they shut off the air almost 100% and this combination makes for a really nice system. I have been flying mine for 7 years and would not change anything.

FWIW
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  #14  
Old 06-19-2017, 10:20 AM
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Bill Boyd Bill Boyd is offline
 
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Default Question about the NACA controller

If mounted as Ed and others have done, just behind the baggage bulkhead, is there potential for EMI to the ADAHRS units that will be mounted on a tray jsut below the top skin, ahead of the next bulkhead to the rear?

Not so much worried about brief EMI emissions during changes in the valve position, but whether the servo draws significant idle current or emits significant RF when it's awaiting the next position command (i.e. 99.99% of flight time). It will be only about 15" or so from the ADAHARS units, with its control wiring routed forward into the overhead console.
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RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
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  #15  
Old 06-19-2017, 10:31 AM
civengpe civengpe is offline
 
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Location: Houston, Texas
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Default

Quote:
Originally Posted by Bill Boyd View Post
If mounted as Ed and others have done, just behind the baggage bulkhead, is there potential for EMI to the ADAHRS units that will be mounted on a tray jsut below the top skin, ahead of the next bulkhead to the rear?

Not so much worried about brief EMI emissions during changes in the valve position, but whether the servo draws significant idle current or emits significant RF when it's awaiting the next position command (i.e. 99.99% of flight time). It will be only about 15" or so from the ADAHARS units, with its control wiring routed forward into the overhead console.
I have mine mounted about 12" or so from my ADAHRS and have not noticed any issues whatsoever.
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  #16  
Old 06-19-2017, 10:34 AM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default I Think

I think a lot of people have mounted it there with no issues.

If you follow the location specs for the ADAHRS unit, the best place to mount it is about 10 feet outside of the wingtip, flying in close formation with the airplane...
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  #17  
Old 06-19-2017, 11:23 AM
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Default

good to know

just thinking ahead.
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RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
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