On a Few of the RV's the owners are putting NACA vents just back of the
trailing edge of the wings to help exhaust the cabin air and relieve
cabin pressure. That may not be a place for positive air flow.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Rocketman
Subject: Re: NACA vent placement (was RE: Europa-List: Gel Coat)
David DeFord wrote:
<davedeford@comcast.net>
>
>
>
>>Now for a question of my own. I'm considering where I should put the
>>NACA vent that will feed the eyeball vents that I'm installing in the
>>overhead panel. I have a fairly large vent with a 2" opening for the
>>feed tubing. Would the intake be effective if installed somewhere in
>>the vicinity of the battery, starboard side, behind the luggage tray,
>>just above flap level, or maybe even below flap level? Would it be
>>possible to locate it underneath the fuselage?
>>
>>Jeff - A055
>>
>>
>
>Jeff,
>
>I would avoid any location below the wings. We had a persistent
problem
>with carbon monoxide in N135TD, and one of the sources turned out to be
>exhaust gas that entered the rear fuselage through the flap drive
slots.
>Even though the air leaking from the tail cone into the cockpit was
diluted
>by a much larger intake from our fresh air vents, we still saw about 30
>parts per million of CO from this source. I suspect that the level
would be
>much higher, if your primary ventilation source were picking up air
that
>contained exhaust emissions. It might be okay if you kept the inlet on
the
>opposite side from the exhaust, but I would make careful measurements
in any
>case. Air pressure is likely to be lower on the aft fuselage surfaces,
so a
>more forward location may give better air flow as well.
>
>Dave DeFord
>N135TD (flying, 320 hours)
>
>
>
>
Dave,
Thanks for the information. I considered the exhaust gas problem, but
assumed that it would not be a problem on the lower starboard side of
the fuselage, due to the prop wash lifting it upward. I also assumed
that the lower fuselage, being fairly flat would give a good airflow
through the vent. Anyone have any experience with vent inlets in these
positions? Would it be possible for someone, with a running Europa, to
make a few CO2 measurements in the areas I'm talking about? Any
assistance would be greatly appreciated...
Jeff - A055
Builders Log: http://www.N55XS.com
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