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Charles Patton:  As a non-engineer, I have trouble decerning whether you
conclude "yes" or "no" with respect to using automotive alternators at
high altitude.

My future intended use (after adding oxygen) is in an LNC2 often
operating between 8 and 18 thousand feet and always in VFR.  If the
automotive alternator shuts down, this might be annoying but not
catastrophic as it can be replaced from any NAPA store for just $112.00
and I actually had it repaired at an alternator shop for just $27.00.

My questions are, "Just how quickly (in operating hours) might an
alternator fail if it is operated at thin atmosphere for perhaps 30% of
all engine time?"  and, "Will the failure be gradual or sudden?"

Thank you for answering.                        Greg Nelson

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