jerry@mc.net wrote:

How about using a siphon breaker chamber in the vent lines to preclude
pulling fuel out of tanks with a inverted U shaped vent line.  I'm working
on this for my Lancair system.  My system, when built, will not allow fuel
to accidentally spill out of the vent system at any  ramp attitude, all
tanks are equally pressure vented, no fuel will spill out while cornering at
any speed.  There is only one vent to receive ram pressure through a NACA
vent in the belly, this  is where NACA vents really function beautifully.

I like the idea put forth, to drill a vent hole to in the vent line, to
avoid ice build-up on the ram port.  I'm not sure if this would be necessary
with a NACA type vent.

How about some help on this.
Question.....are NACA vents immune to rain, ice, slush entering the opening
since the ramp SEEMS to only accept air to the pressure chamber/ramp
opening?

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