X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qmta04.westchester.pa.mail.comcast.net ([76.96.62.40] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTP id 5812791 for flyrotary@lancaironline.net; Mon, 15 Oct 2012 15:37:27 -0400 Received-SPF: none receiver=logan.com; client-ip=76.96.62.40; envelope-from=gordon@acumen-ea.com Received: from omta14.westchester.pa.mail.comcast.net ([76.96.62.60]) by qmta04.westchester.pa.mail.comcast.net with comcast id BNyg1k0011HzFnQ54Xcyu7; Mon, 15 Oct 2012 19:36:58 +0000 Received: from GordonHPelite ([76.123.51.236]) by omta14.westchester.pa.mail.comcast.net with comcast id BXXx1k00455mGuc3aXXxVt; Mon, 15 Oct 2012 19:31:57 +0000 From: "Gordon Alling" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: skydivers-supersonic-24-mile-jump Date: Mon, 15 Oct 2012 15:31:52 -0400 Message-ID: <007301cdab0b$baef0930$30cd1b90$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0074_01CDAAEA.33DD6930" X-Mailer: Microsoft Office Outlook 12.0 Content-Language: en-us thread-index: Ac2rBmllou4UXoqdRJe6cEdF7oeW6QABQbqw This is a multi-part message in MIME format. ------=_NextPart_000_0074_01CDAAEA.33DD6930 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Look up "thermosphere" http://en.wikipedia.org/wiki/Thermosphere That citation suggests that it is above his jump altitude. But, I wouldn't be surprised if he was approaching the lower levels of it. Gordon C. Alling, Jr., PE President acumen Engineering/Analysis, Inc. 540-786-2200 www.acumen-ea.com From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of marv@lancair.net Sent: Monday, October 15, 2012 2:54 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: skydivers-supersonic-24-mile-jump 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. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0074_01CDAAEA.33DD6930 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Look up = “thermosphere”

http://en.wikipedia.or= g/wiki/Thermosphere

That citation suggests that it = is above his jump altitude. = But, I wouldn’t be surprised if he was approaching the = lower levels of it.

Gordon C. Alling, Jr., = PE

President=

acumen Engineering/Analy= sis, Inc.

540-786-2200

www.acumen-ea.com

From: Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On Behalf Of = marv@lancair.net
Sent: Monday, October 15, 2012 = 2:54 PM
To: Rotary = motors in aircraft
Subject: [FlyRotary] Re: = skydivers-supersonic-24-mile-jump

<= br>

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>

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