"Rocket vents" in -a model?

[azonic75]

Has anyone gone with a rocket style coiled fuel vent in an -A model?
Curious to know if they vent quite a bit of fuel on the ground when full as the relative position of the vent at the fuel tank is lower on the ground

Kai

[vlittle]

Originally Posted by azonic75

Has anyone gone with a rocket style coiled fuel vent in an -A model?
Curious to know if they vent quite a bit of fuel on the ground when full as the relative position of the vent at the fuel tank is lower on the ground

Kai

The secret to these vents is that the coils are a reservoir for the fuel to expand into before overflowing. With a full tank, the fuel may expand, pushing air and fuel from the tank into the coils. If it expands enough, the fuel overflows the vent.

This explanation is identical for the stock Van's vent. The vent line in the fuselage is the reservoir in this case.

So, if you took the length of vent line from the tank coupling to the high point of the Van's setup and instead rolled it into a coil with the top of the last coil corresponding, you have the same reservoir setup.

The -A vs. taildragger may make a slight difference (in both cases) if the vent line in the tank is not terminated at the high point.

Conclusion: more turns in the coil is better.

See http://www.vansairforce.com/communit...ead.php?t=1062