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Roy

I have been flying a Lancair 290 without a header tank for 7 years and I have
never had a problem with un porting.  I added a bulkhead at the BL 60 with a
flapper valve that allows fuel into the sump but not back out similar to how
Lancair does the Lancair IV.  I also added a bulkhead about 6 inches back from
the rear of the Main spar and parallel to the spar to keep the fuel from
unporting with the nose pitched down.  I did not feel the need for a flop tube
and I still dont think that it is necessary unless you intend to do negative G
manuvers.  I have tested this design down to 1 gal without unporting.

Tom Byrnes N133TB