For production aircraft, FAA requires two vents if you have one tank.
Another rule says a sole, exposed vent on the bottom of the aircraft
can be clogged by mud or snow.
It is certainly possible a builder may not experience a problem in
service, but in the U.S. at least, one should consider that upon sale
of the aircraft there's a serious liability problem in the event the
seller suffers an accident. While homebuilder liability in general is
arguably difficult to establish in most states, this is an example
where the builder/seller would make it easy. It's contrary to clear
FAA rules available as guidance and to the kit mfr's instructions. At
least install and test a 2nd vent before you sell her!
Reg,
Fred F.
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