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To: Bill N7WB

The only real reason I can think of for transferring fuel to the header tank
is to keep the engine running. If that's a bit of extra pilot work-load, I
guess I'll pay the price -- considering the alternative!

Seriously, I can think of several reasons for this system configuration.
One, and probably the most compelling, is the fact that should you lose all
pumping capability (mechanical AND electrical - an admittedly low
probability) AND  your engine is normally aspirated, the head from a full
header could probably keep the fires burning, though at a reduced power
setting while you found somewhere smooth to set down. Second, I like the
resultant CG with a full header - which continues to get more 'n more
forward as the wings empty whilst the header is kept full. Third, I can get
more fuel in the plane than if I had wing tanks only; it's on the
center-line (lateral, anyway) without putting too much weight way outboard
into the wing outer panels. Flew one that had fuel out there and I
personally do not like all that mass that far outboard in a light aircraft
like the Lancair.

It's easy to train yourself to keep it full or you can use a timer. What's
personally decidedly not easy  is to remember to turn the d--- pumps off
when the header is full. Do this and you'll pump fuel overboard thru the
vent until you remember or start smelling the gas running back on your
belly. That get's your attention *raht naow*!! Lots of simple ways around
the problem - see info submitted on this subject in past LML's - probably
prior to Dec '98.

Dan Schaefer
N235SP
MT'ing good these days!

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