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From: "=?utf-8?b?SmFycmV0dCBKb2huc29u?=" <hjjohnson@sasktel.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: skydivers-supersonic-24-mile-jump
Date: Mon, 15 Oct 2012 13:45:44 -0600
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Jarrett Johnson  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. 

OOps.. sorry I missed that point!  I wonder if it's due to solar 
heating of the toropopause?  If you look here  
http://www.engineeringtoolbox.com/standard-atmosphere-d_604.html you'll 
see

that there is actually an increase in temp at those altitudes?  I'm not 
sure as to the 'why' but it appears that it does. I recall being told 
this during my ATPL groundschool but couldn't tell you 'why' it gets 
hotter.. 

Fwiw

Jarrett



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<style>p{margin: 0;padding: 0;}</style><P><BR><BR><BR><BR><BR><BR>Jarrett
Johnson &lt;hjjohnson@sasktel.net&gt; wrote:<BR><BR>"""Some of that temp rise
will be aerodynamic heating. I know at 280knts and <BR>24,000ft I'm seeing
10-15decC rise in temp... At 800+mph the temp rise would <BR>be a lot higher,
even at 70K+ ft.<BR>"""</P>
<BLOCKQUOTE style="BORDER-LEFT: rgb(0,0,0) 2px solid; PADDING-LEFT: 5px;
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px" dir=ltr
_mce_style="border-left: 2px solid #000000; padding-right: 0px; padding-left:
5px; margin-left: 5px; margin-right: 0px;">
<DIV id=html-message>
<DIV style="FONT: 10pt arial,helvetica,sans-serif" id=_htmlarea_default_style_
_mce_style="font: 10pt arial,helvetica,sans-serif;">
<DIV align=left>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. &nbsp;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. &nbsp;It'll be way
interesting to hear the actual reason.</DIV>
<DIV align=left><BR></DIV>
<DIV align=left>&nbsp; &lt;marv&gt;</DIV>
<DIV align=left><BR></DIV></DIV>
<P>&nbsp;</P><PRE>OOps.. sorry I missed that point!  I wonder if it's due to
solar heating of the toropopause?  If you look here  <A
href="http://www.engineeringtoolbox.com/standard-atmosphere-d_604.html">http://www.engineeringtoolbox.com/standard-atmosphere-d_604.html</A>
you'll see </PRE><PRE>that there is actually an increase in temp at those
altitudes?  I'm not sure as to the 'why' but it appears that it does. I recall
being told this during my ATPL groundschool but couldn't tell you 'why' it gets
hotter..</PRE><PRE>&nbsp;</PRE><PRE>Fwiw</PRE><PRE>Jarrett</PRE></DIV></BLOCKQUOTE>
<P><BR></P>
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