Jarrett Johnson <hjjohnson@sasktel.net> wrote:

"""

Some of that temp rise will be aerodynamic heating. I know at 280knts and
24,000ft I'm seeing 10-15decC rise in temp... At 800+mph the temp rise would
be a lot higher, even at 70K+ ft.
"""

Airspeed definitely wasn't the case here.. this was during the ascent, when he was rising about 1000fpm, maybe less (don't remember exactly) but his speed over the ground had by then diminished to 15-20 knots, just floating along with the flow up there. I, too, am curious about why ambient temps started to rise as altitude increased... I'd have figured it to just keep going down right in step with the ambient pressure. It'll be way interesting to hear the actual reason.

<marv>