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To: Charles Keller

I have been flying my Lancair 290 for 6 Years (350 Hrs) without a header tank
and have never had a problem.

I installed a rib with a flapper valve at the BL 60
I also put in a bulkhead parallel to the spar about 6 inches rear of the spar
to help keep it from unporting with the nose down.  The BL60 rib and the
bulkhead parallel to the spar are sealed off completely except for a vent hole
at the top of the BL60 rib and the flapper valve at the low point of the BL60.
I have a fuel selector that select R L and off no both  
I have tested this system extensively and it will not unport until the tank is
down to about 1 Gal and then only with cross controls to make it unport.  With
fuel levels above 1 Gal it will not unport.  I don't however,  ever let the
tank that I am on go below about 5 Gals when I am in the takeoff or landing
mode.

Tom Byrnes N133TB