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These concerns about the poor performance of the continental TSIO 550 are
valid.  They have needed to be topped regularly at 500 hours and are getting
replaced by a 1000 - 1200 hours.  I chose to go with the Walters turbine
because it was more reliable and cost less.  Another route to go is to use
the continental but to fly conservatively and not expect the published
numbers of a 300 knot cruise.  The engine is not a bad engine, just too small
for the needs of a Lancair pilot trying to get the published performance.

I have not flown yet, but my wings are fuel tanks.  Every inch is used.  I
even changed the push pull aileron tube to a torque tube so that I could seal
it easier. I have a two place airplane when the aux. tank is filled.

Since I have not flown my kit as yet, I offer not that your ideas work, but
that they have been chosen to be tested by another.  Intend to fly by this
time next year.
Ross Tye Walters Lancair IV
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