"Sneed, Glen" wrote:

The idea of connecting the inner and outer tanks with a large pipe and a one
way valve is a good idea because you only need one filer cap.  I suggest a
flow restrictor between the tanks and not a valve.  This now becomes a
single tank with a baffle.  The flow restrictor can be as simple as a heavy
door hinge that rotates towards the wing root.  In a low wing condition, the
hinge cover the connector pipe inlet and restricts the fuel flow back to the
outer tank but will not restrict the flow to the inner tank.  Now we have a
single tank with a baffle, one return line per tank in a convenient
location, one fuel cap per wing, and one vent.

This method is used in an all composite limited aerobatics 2 place. The wet
wing tank span several wing ribs.  The prototype has been flying for 4-5
years with no problems.

Glenn Sneed

 
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