Posted for "terrence o'neill" <troneill@charter.net>:

 Colyn,
    Good questions. .
    Re the wings, I was thinking  solenoids or ? for quick shutoffs, firmly
attached at the wing root would help keep sprayed fuel out of the fuselage..
 Another idea was to try to blow the wing fuel out a dump door, but any
gyrations in flight would defeat that idea.    It would be a lot easier to
stuff foam into the wing tank areas. .. and protect and foam-baffle the header
tank.   Someone invented spongy but fuel-proof foam for that purpose ... I had
a link about 5 years ago, and was going to do that to our Dragonfly main tank
under the seat, but they wouldn't sell except to major corps, and shortly
thereafter we sold the Dragonfly and bought the Lancair project last year.
   I'm hoping foam nowadays no longer needs replacement.   I have bever fouond
water in the Dragonfly's plastic tanks, in 5 years.  I'll  ask ATL about water
entrapment, and how permanent the currently used foam is, and report back.
 What's your offline e-mail address?  Mine's troneill@charter.net
 Terrence
 
"""
  Terrence,
      I'm interested in pursuing this.   I actually have an aux tank built by
fuelsafe which has foarm in it to manage flammability.   However, one of the
other mailing list members commented that foarm makes it difficult to purge
the water from a tank.   So that is one issue with foam.
      I'd like to know more about your check valve idea.
      I have a IVP which is probably a different problem than a 320 so my
comments below reflect that.
 
      I have noted that most Lancair's that crash also burn enthusiastically
but I don't know what the mechanism is.    I would guess:
      1) fuel lines rupture at the wing root.   Do you have a solution for
that?   Seems like you would need a remote valve.
      2) fuel tank (wing) breaks and spills.   Foarm would help here but how
do you replace it every 10 years?  ...and deal with the water. bladder inside
wing would be problematic given the replacement problem and in the IV the
number of ribs and spars that cut through the tank area.
 
  Colyn Case
"""