Wrathall Mark wrote:

You can make a low wing aircraft work with a BOTH fuel system. The RNZAF CT4
Airtrainers Aerobatics) have this system. Two wing tanks T'd. The two vents
are extended to the wing tips where thy are connected with a rubber tube and
hose clamps to an L  tube facing forward. (a crude pitot tube). If the
pilots report uneven feeding, you just rotated the vent tube for the
overfeeding tank a little out of the relative wind. (trial and error). The L
tube had a couple of little drillings in the aft end to keep it venting of a
bug blocked the entrance. There was only an ON/Off valve, so the pilots
would have to fly in a sideslip to level the tanks if they discovered a feed
imbalance on a cross-country.

While I worked on them the only fuel related failure was a student who let a
line-boy at a GA field fuel the plane with Jet A1, and them tried to fly
home. "Nothing is fool-proof to an especially innovative fool"

Mark,

This is very interesting.  I'd love to see a detailed layout of this with
line sizes
and some reference of vertical positions of the components.  All that I have
heard,
read and seen says that this isn't safe, but of course it works here, so I
would like
to learn how they do it.  May have something to do with the vents being higher
than the tanks . . .      Sounds like time to learn.  Know anybody that might
have access to the fuel system dwgs, pilot's handbook or NZ equiv of NATOPS
manual?  Nice looking bird, too - looks a bit like the Italian trainer, SM260 or
something like that.  Is that you having fun in it?

Bill
Long EZ builder & pilot
mechanical engineer

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