"Jim Carter" wrote in message
t...
During a recent discussion about calculating glide ratio, I began to
wonder what the effects of pressure altitude were on the glide ratio of an
aircraft. Since air is 50% as dense at FL180 as at sea level, would the
glide ratio increase (glide further) as altitude decreases? AND if there
is a difference in glide ratio as altitude changes, then what values do
most manufacturers use when they publish their numbers (if they do)?

As you descend, drag increases.

Remember that the purpose if having an engine (thrust) is to overcome
weight, but also DRAG.


Oh yeah, I do understand that glide ratio changes to 0:0 upon impact, so
the wags can skip that part of the reply...

Okay...I'll skip that point! :~)

--
Matt Barrow
Performance Homes, LLC.
Cheyenne, WY