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Carl, ouch! where were you 3
years ago when I was in the market?
Anyway, I looked into expanding wing
tanks. you have to peel off the bottom skin, seal the new bays, reskin,
leak test, purge, rework, repaint. So you have to find someone who
owes you a favor or is out of work.
However, an alternative is to put a tank right
behind the rear seat bulkhead. However, this only works with certain
loadings and depends on the CG of your aircraft. I had one built by fuel-safe in Bend. It exactly
fits the space between the extended luggage floor (top of gear well where the
wheels are) down to the bottom of the rear seat pressure bulkhead.
Mine holds 21 gallons. There's a variant of the 2-way fuel valve
with vapor return that is 3-way.
In my airplane the CG implications are one
140lber or less in the back seat, but you are going to be over gross if you do
more than that anyway. My airplane has more forward CG than most IV's
though. YMMV
Colyn
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