Hi Eliacim,
You refer to the 415-C fuel system with vented caps. ERCO replaced
that system with unvented wing caps. I would speculate that this was
because venting each wing tank individually with a forward facing hole
in the fuel cap resulted in a pressure differential between the tanks.
This pressure differential would be the natural result of the
spiraling slipstream of air from the prop along the fuselage. On one
side the air is coming downward somewhat (from above the wing
centerline), increasing pressure in the tank on that side. On the
other side air pressure upward (from below the wing centerline) would
act to decrease pressure in the tank on that side.
Running the two together before venting assures that whether pressure
is positive, negative or neutral it is the same for both tanks.
Regards,
WRB
--
On Aug 17, 2010, at 19:02, <[email protected]> wrote:
John
Maybe I am missing something obvious, but wouldn't simply venting both
tanks connect the air spaces through the atmosphere?
That works for our normal (small) wing tanks. What am I missing here?
Eliacim
