X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-gg0-f180.google.com ([209.85.161.180] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTPS id 5813151 for flyrotary@lancaironline.net; Mon, 15 Oct 2012 20:05:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.161.180; envelope-from=rwstracy@gmail.com Received: by mail-gg0-f180.google.com with SMTP id q3so1361679gge.25 for ; Mon, 15 Oct 2012 17:05:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=zcGa0YMA2md7YITTxhBimyK6cpdB8UA9YVY+jN5lM/M=; b=x3NGZyBgy5rCTN9msSZrByQ29u2cjc/jjIjgjZzYr9hISI2kXEiXg64k/Dzz4CBQCa Wb9m0Vhwrz5fIGx5bGw6H6z/L5JdXqbBL+KMcbZ5MyxCqi/IcEFeCIsgcpWcwymwYB0t e53y0dYwfvK0LFFOQOkqPkdlwdx9oVroBkD287QdALp2Z3mk4K4Ghlzxno7+j78ME3lk SBAE7yL1gRGxar5SYTIfk6/SyYRZaccI8kC1ubahW2V72hGG0BXsh3vTPOiQIcvpMeNc HV8phNRpRGW2zUNTFkaZOKTiYGkuCpfCiwxHRIIKOvHqCe4OMzkOXYd0ZXJtiw227+9C EdCw== Received: by 10.236.77.39 with SMTP id c27mr4345265yhe.102.1350345914987; Mon, 15 Oct 2012 17:05:14 -0700 (PDT) Return-Path: Received: from [192.168.1.3] (95.sub-70-196-195.myvzw.com. [70.196.195.95]) by mx.google.com with ESMTPS id f15sm14983812anm.9.2012.10.15.17.05.12 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 15 Oct 2012 17:05:14 -0700 (PDT) Subject: Re: [FlyRotary] Re: skydivers-supersonic-24-mile-jump References: From: Tracy Content-Type: multipart/alternative; boundary=Apple-Mail-CDBFB16C-2B8B-4864-9429-AB54EBD1FC54 X-Mailer: iPad Mail (10A403) In-Reply-To: Message-Id: Date: Mon, 15 Oct 2012 18:05:11 -0600 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-CDBFB16C-2B8B-4864-9429-AB54EBD1FC54 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable There are temperature inversion conditions in the atmosphere. I have encoun= tered them myself but don't know if they happen that high or not. Tracy Sent from my iPad On Oct 15, 2012, at 12:54 PM, wrote: >=20 >=20 >=20 >=20 >=20 >=20 > Jarrett Johnson wrote: >=20 > """ > Some of that temp rise will be aerodynamic heating. I know at 280knts and=20= > 24,000ft I'm seeing 10-15decC rise in temp... At 800+mph the temp rise wou= ld=20 > be a lot higher, even at 70K+ ft. > """ > Airspeed definitely wasn't the case here.. this was during the ascent, whe= n he was rising about 1000fpm, maybe less (don't remember exactly) but his s= peed over the ground had by then diminished to 15-20 knots, just floating al= ong with the flow up there. I, too, am curious about why ambient temps star= ted to rise as altitude increased... I'd have figured it to just keep going d= own right in step with the ambient pressure. It'll be way interesting to he= ar the actual reason. >=20 > >=20 > -- >=20 > Homepage: http://www.flyrotary.com/ >=20 > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html --Apple-Mail-CDBFB16C-2B8B-4864-9429-AB54EBD1FC54 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit

There are temperature inversion conditions in the atmosphere. I have encountered them myself but don't know if they happen that high or not.

Tracy

Sent from my iPad

On Oct 15, 2012, at 12:54 PM, <marv@lancair.net> wrote:

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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