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Kevin,
<<What concerns me about ram air to create positive pressure inside the
fuel tanks is the possibility of rain water being rammed along with
the air into the tanks>>
Note that flow through the vent is effectively zero.
The vent is just generating static pressure. If you have a short vertical
run, up into the wing for example, there is really nothing trying to push water
in the form of individual droplets up the tube. Fully submerging the
tube end in water would be a different story.
Chris Zavatson
N91CZ
360std
www.N91CZ.com
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