On Jan 21, 5:25*pm, Tman wrote:
wrote:

* In the carb, one-half the density should then cut the pressure
differential and therefore fuel flow by one quarter, which will give
us a mixture twice a rich as when we took off. *

At the risk of dragging on the subject ... Wouldn't that actually lean
it out, requiring one to compensate by richening the mixture at higher
altitudes? *One-half the density i.e. one half the mass airflow at
constant velocity, fuel flow by quarter... sounds like that mixture is
leaner!

No, the fuel flow drops by a quarter, to three-quarters of what
it was at sea level. With half the density, that gives us a mixture
that is half again as rich as it was at sea level, requiring leaning.

Dan